Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts
Electrostatic electron cyclotron harmonic (ECH) waves generated by the electron loss cone distribution can produce efficient scattering loss of plasma sheet electrons, which has a significant effect on the dynamics in the outer magnetosphere. Here we report two ECH emission events around the same lo...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Zhou, Qinghua [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017 |
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| Rechteinformationen: |
Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. |
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| Übergeordnetes Werk: |
Enthalten in: Geophysical research letters - Washington, DC : Union, 1974, 44(2017), 11, Seite 5251-5258 |
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| Übergeordnetes Werk: |
volume:44 ; year:2017 ; number:11 ; pages:5251-5258 |
| Links: |
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| DOI / URN: |
10.1002/2017GL073051 |
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| 245 | 1 | 0 | |a Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts |
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| 520 | |a Electrostatic electron cyclotron harmonic (ECH) waves generated by the electron loss cone distribution can produce efficient scattering loss of plasma sheet electrons, which has a significant effect on the dynamics in the outer magnetosphere. Here we report two ECH emission events around the same location L ≈ 5.7–5.8, MLT ≈ 12 from Van Allen Probes on 11 February (event A) and 9 January 2014 (event B), respectively. The spectrum of ECH waves was centered at the lower half of the harmonic bands during event A, but the upper half during event B. The observed electron phase space density in both events is fitted by the subtracted bi‐Maxwellian distribution, and the fitting functions are used to evaluate the local growth rates of ECH waves based on a linear theory for homogeneous plasmas. ECH waves are excited by the loss cone instability of 50 eV–1 keV electrons in the lower half of harmonic bands in the low‐density plasmasphere in event A, and 1–10 keV electrons in the upper half of harmonic bands in a relatively high‐density region in event B. The current results successfully explain observations and provide a first direct evidence on how ECH waves are generated in the lower and upper half of harmonic frequency bands. Initial data reported on two ECH wave events around the same location but in the different frequency band Numerical simulations show that ECH waves can be generated in the different half of harmonic frequency bands The background density and electron temperature are the main factors to yield the difference of wave spectrum | ||
| 540 | |a Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. | ||
| 650 | 4 | |a wave‐particle interaction | |
| 650 | 4 | |a RBSP results | |
| 650 | 4 | |a ECH waves | |
| 650 | 4 | |a Plasmasphere | |
| 650 | 4 | |a Sensors | |
| 650 | 4 | |a Density | |
| 650 | 4 | |a Probes | |
| 650 | 4 | |a Radiation belts | |
| 650 | 4 | |a Stability | |
| 650 | 4 | |a Dynamics | |
| 650 | 4 | |a Maxwellian distribution | |
| 650 | 4 | |a Magnetospheres | |
| 650 | 4 | |a Growth | |
| 650 | 4 | |a Scattering | |
| 650 | 4 | |a Magnetosphere | |
| 650 | 4 | |a Radiation | |
| 650 | 4 | |a Distribution | |
| 650 | 4 | |a Belts | |
| 650 | 4 | |a Cyclotrons | |
| 650 | 4 | |a Waves | |
| 650 | 4 | |a Radiations | |
| 650 | 4 | |a Plasmas | |
| 650 | 4 | |a Emission | |
| 650 | 4 | |a Frequency | |
| 650 | 4 | |a Frequencies | |
| 650 | 4 | |a Instability | |
| 650 | 4 | |a Space density | |
| 700 | 1 | |a Xiao, Fuliang |4 oth | |
| 700 | 1 | |a Yang, Chang |4 oth | |
| 700 | 1 | |a Liu, Si |4 oth | |
| 700 | 1 | |a He, Yihua |4 oth | |
| 700 | 1 | |a Baker, D. N |4 oth | |
| 700 | 1 | |a Spence, H. E |4 oth | |
| 700 | 1 | |a Reeves, G. D |4 oth | |
| 700 | 1 | |a Funsten, H. O |4 oth | |
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| 856 | 4 | 1 | |u http://dx.doi.org/10.1002/2017GL073051 |3 Volltext |
| 856 | 4 | 2 | |u http://onlinelibrary.wiley.com/doi/10.1002/2017GL073051/abstract |
| 856 | 4 | 2 | |u https://search.proquest.com/docview/1913910113 |
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10.1002/2017GL073051 doi PQ20170721 (DE-627)OLC1994203781 (DE-599)GBVOLC1994203781 (PRQ)p1009-838e85dab5bcf33a063f68852744014f1abb809e86d2c743010c8b57c16d9410 (KEY)0026932820170000044001105251generationoflowerandupperbandsofelectrostaticelect DE-627 ger DE-627 rakwb eng 550 DNB 38.70 bkl Zhou, Qinghua verfasserin aut Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Electrostatic electron cyclotron harmonic (ECH) waves generated by the electron loss cone distribution can produce efficient scattering loss of plasma sheet electrons, which has a significant effect on the dynamics in the outer magnetosphere. Here we report two ECH emission events around the same location L ≈ 5.7–5.8, MLT ≈ 12 from Van Allen Probes on 11 February (event A) and 9 January 2014 (event B), respectively. The spectrum of ECH waves was centered at the lower half of the harmonic bands during event A, but the upper half during event B. The observed electron phase space density in both events is fitted by the subtracted bi‐Maxwellian distribution, and the fitting functions are used to evaluate the local growth rates of ECH waves based on a linear theory for homogeneous plasmas. ECH waves are excited by the loss cone instability of 50 eV–1 keV electrons in the lower half of harmonic bands in the low‐density plasmasphere in event A, and 1–10 keV electrons in the upper half of harmonic bands in a relatively high‐density region in event B. The current results successfully explain observations and provide a first direct evidence on how ECH waves are generated in the lower and upper half of harmonic frequency bands. Initial data reported on two ECH wave events around the same location but in the different frequency band Numerical simulations show that ECH waves can be generated in the different half of harmonic frequency bands The background density and electron temperature are the main factors to yield the difference of wave spectrum Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. wave‐particle interaction RBSP results ECH waves Plasmasphere Sensors Density Probes Radiation belts Stability Dynamics Maxwellian distribution Magnetospheres Growth Scattering Magnetosphere Radiation Distribution Belts Cyclotrons Waves Radiations Plasmas Emission Frequency Frequencies Instability Space density Xiao, Fuliang oth Yang, Chang oth Liu, Si oth He, Yihua oth Baker, D. N oth Spence, H. E oth Reeves, G. D oth Funsten, H. O oth Enthalten in Geophysical research letters Washington, DC : Union, 1974 44(2017), 11, Seite 5251-5258 (DE-627)129095109 (DE-600)7403-2 (DE-576)01443122X 0094-8276 nnns volume:44 year:2017 number:11 pages:5251-5258 http://dx.doi.org/10.1002/2017GL073051 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017GL073051/abstract https://search.proquest.com/docview/1913910113 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_47 GBV_ILN_62 GBV_ILN_154 GBV_ILN_601 GBV_ILN_2279 38.70 AVZ AR 44 2017 11 5251-5258 |
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10.1002/2017GL073051 doi PQ20170721 (DE-627)OLC1994203781 (DE-599)GBVOLC1994203781 (PRQ)p1009-838e85dab5bcf33a063f68852744014f1abb809e86d2c743010c8b57c16d9410 (KEY)0026932820170000044001105251generationoflowerandupperbandsofelectrostaticelect DE-627 ger DE-627 rakwb eng 550 DNB 38.70 bkl Zhou, Qinghua verfasserin aut Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Electrostatic electron cyclotron harmonic (ECH) waves generated by the electron loss cone distribution can produce efficient scattering loss of plasma sheet electrons, which has a significant effect on the dynamics in the outer magnetosphere. Here we report two ECH emission events around the same location L ≈ 5.7–5.8, MLT ≈ 12 from Van Allen Probes on 11 February (event A) and 9 January 2014 (event B), respectively. The spectrum of ECH waves was centered at the lower half of the harmonic bands during event A, but the upper half during event B. The observed electron phase space density in both events is fitted by the subtracted bi‐Maxwellian distribution, and the fitting functions are used to evaluate the local growth rates of ECH waves based on a linear theory for homogeneous plasmas. ECH waves are excited by the loss cone instability of 50 eV–1 keV electrons in the lower half of harmonic bands in the low‐density plasmasphere in event A, and 1–10 keV electrons in the upper half of harmonic bands in a relatively high‐density region in event B. The current results successfully explain observations and provide a first direct evidence on how ECH waves are generated in the lower and upper half of harmonic frequency bands. Initial data reported on two ECH wave events around the same location but in the different frequency band Numerical simulations show that ECH waves can be generated in the different half of harmonic frequency bands The background density and electron temperature are the main factors to yield the difference of wave spectrum Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. wave‐particle interaction RBSP results ECH waves Plasmasphere Sensors Density Probes Radiation belts Stability Dynamics Maxwellian distribution Magnetospheres Growth Scattering Magnetosphere Radiation Distribution Belts Cyclotrons Waves Radiations Plasmas Emission Frequency Frequencies Instability Space density Xiao, Fuliang oth Yang, Chang oth Liu, Si oth He, Yihua oth Baker, D. N oth Spence, H. E oth Reeves, G. D oth Funsten, H. O oth Enthalten in Geophysical research letters Washington, DC : Union, 1974 44(2017), 11, Seite 5251-5258 (DE-627)129095109 (DE-600)7403-2 (DE-576)01443122X 0094-8276 nnns volume:44 year:2017 number:11 pages:5251-5258 http://dx.doi.org/10.1002/2017GL073051 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017GL073051/abstract https://search.proquest.com/docview/1913910113 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_47 GBV_ILN_62 GBV_ILN_154 GBV_ILN_601 GBV_ILN_2279 38.70 AVZ AR 44 2017 11 5251-5258 |
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10.1002/2017GL073051 doi PQ20170721 (DE-627)OLC1994203781 (DE-599)GBVOLC1994203781 (PRQ)p1009-838e85dab5bcf33a063f68852744014f1abb809e86d2c743010c8b57c16d9410 (KEY)0026932820170000044001105251generationoflowerandupperbandsofelectrostaticelect DE-627 ger DE-627 rakwb eng 550 DNB 38.70 bkl Zhou, Qinghua verfasserin aut Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Electrostatic electron cyclotron harmonic (ECH) waves generated by the electron loss cone distribution can produce efficient scattering loss of plasma sheet electrons, which has a significant effect on the dynamics in the outer magnetosphere. Here we report two ECH emission events around the same location L ≈ 5.7–5.8, MLT ≈ 12 from Van Allen Probes on 11 February (event A) and 9 January 2014 (event B), respectively. The spectrum of ECH waves was centered at the lower half of the harmonic bands during event A, but the upper half during event B. The observed electron phase space density in both events is fitted by the subtracted bi‐Maxwellian distribution, and the fitting functions are used to evaluate the local growth rates of ECH waves based on a linear theory for homogeneous plasmas. ECH waves are excited by the loss cone instability of 50 eV–1 keV electrons in the lower half of harmonic bands in the low‐density plasmasphere in event A, and 1–10 keV electrons in the upper half of harmonic bands in a relatively high‐density region in event B. The current results successfully explain observations and provide a first direct evidence on how ECH waves are generated in the lower and upper half of harmonic frequency bands. Initial data reported on two ECH wave events around the same location but in the different frequency band Numerical simulations show that ECH waves can be generated in the different half of harmonic frequency bands The background density and electron temperature are the main factors to yield the difference of wave spectrum Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. wave‐particle interaction RBSP results ECH waves Plasmasphere Sensors Density Probes Radiation belts Stability Dynamics Maxwellian distribution Magnetospheres Growth Scattering Magnetosphere Radiation Distribution Belts Cyclotrons Waves Radiations Plasmas Emission Frequency Frequencies Instability Space density Xiao, Fuliang oth Yang, Chang oth Liu, Si oth He, Yihua oth Baker, D. N oth Spence, H. E oth Reeves, G. D oth Funsten, H. O oth Enthalten in Geophysical research letters Washington, DC : Union, 1974 44(2017), 11, Seite 5251-5258 (DE-627)129095109 (DE-600)7403-2 (DE-576)01443122X 0094-8276 nnns volume:44 year:2017 number:11 pages:5251-5258 http://dx.doi.org/10.1002/2017GL073051 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017GL073051/abstract https://search.proquest.com/docview/1913910113 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_47 GBV_ILN_62 GBV_ILN_154 GBV_ILN_601 GBV_ILN_2279 38.70 AVZ AR 44 2017 11 5251-5258 |
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10.1002/2017GL073051 doi PQ20170721 (DE-627)OLC1994203781 (DE-599)GBVOLC1994203781 (PRQ)p1009-838e85dab5bcf33a063f68852744014f1abb809e86d2c743010c8b57c16d9410 (KEY)0026932820170000044001105251generationoflowerandupperbandsofelectrostaticelect DE-627 ger DE-627 rakwb eng 550 DNB 38.70 bkl Zhou, Qinghua verfasserin aut Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Electrostatic electron cyclotron harmonic (ECH) waves generated by the electron loss cone distribution can produce efficient scattering loss of plasma sheet electrons, which has a significant effect on the dynamics in the outer magnetosphere. Here we report two ECH emission events around the same location L ≈ 5.7–5.8, MLT ≈ 12 from Van Allen Probes on 11 February (event A) and 9 January 2014 (event B), respectively. The spectrum of ECH waves was centered at the lower half of the harmonic bands during event A, but the upper half during event B. The observed electron phase space density in both events is fitted by the subtracted bi‐Maxwellian distribution, and the fitting functions are used to evaluate the local growth rates of ECH waves based on a linear theory for homogeneous plasmas. ECH waves are excited by the loss cone instability of 50 eV–1 keV electrons in the lower half of harmonic bands in the low‐density plasmasphere in event A, and 1–10 keV electrons in the upper half of harmonic bands in a relatively high‐density region in event B. The current results successfully explain observations and provide a first direct evidence on how ECH waves are generated in the lower and upper half of harmonic frequency bands. Initial data reported on two ECH wave events around the same location but in the different frequency band Numerical simulations show that ECH waves can be generated in the different half of harmonic frequency bands The background density and electron temperature are the main factors to yield the difference of wave spectrum Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. wave‐particle interaction RBSP results ECH waves Plasmasphere Sensors Density Probes Radiation belts Stability Dynamics Maxwellian distribution Magnetospheres Growth Scattering Magnetosphere Radiation Distribution Belts Cyclotrons Waves Radiations Plasmas Emission Frequency Frequencies Instability Space density Xiao, Fuliang oth Yang, Chang oth Liu, Si oth He, Yihua oth Baker, D. N oth Spence, H. E oth Reeves, G. D oth Funsten, H. O oth Enthalten in Geophysical research letters Washington, DC : Union, 1974 44(2017), 11, Seite 5251-5258 (DE-627)129095109 (DE-600)7403-2 (DE-576)01443122X 0094-8276 nnns volume:44 year:2017 number:11 pages:5251-5258 http://dx.doi.org/10.1002/2017GL073051 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017GL073051/abstract https://search.proquest.com/docview/1913910113 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_47 GBV_ILN_62 GBV_ILN_154 GBV_ILN_601 GBV_ILN_2279 38.70 AVZ AR 44 2017 11 5251-5258 |
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10.1002/2017GL073051 doi PQ20170721 (DE-627)OLC1994203781 (DE-599)GBVOLC1994203781 (PRQ)p1009-838e85dab5bcf33a063f68852744014f1abb809e86d2c743010c8b57c16d9410 (KEY)0026932820170000044001105251generationoflowerandupperbandsofelectrostaticelect DE-627 ger DE-627 rakwb eng 550 DNB 38.70 bkl Zhou, Qinghua verfasserin aut Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Electrostatic electron cyclotron harmonic (ECH) waves generated by the electron loss cone distribution can produce efficient scattering loss of plasma sheet electrons, which has a significant effect on the dynamics in the outer magnetosphere. Here we report two ECH emission events around the same location L ≈ 5.7–5.8, MLT ≈ 12 from Van Allen Probes on 11 February (event A) and 9 January 2014 (event B), respectively. The spectrum of ECH waves was centered at the lower half of the harmonic bands during event A, but the upper half during event B. The observed electron phase space density in both events is fitted by the subtracted bi‐Maxwellian distribution, and the fitting functions are used to evaluate the local growth rates of ECH waves based on a linear theory for homogeneous plasmas. ECH waves are excited by the loss cone instability of 50 eV–1 keV electrons in the lower half of harmonic bands in the low‐density plasmasphere in event A, and 1–10 keV electrons in the upper half of harmonic bands in a relatively high‐density region in event B. The current results successfully explain observations and provide a first direct evidence on how ECH waves are generated in the lower and upper half of harmonic frequency bands. Initial data reported on two ECH wave events around the same location but in the different frequency band Numerical simulations show that ECH waves can be generated in the different half of harmonic frequency bands The background density and electron temperature are the main factors to yield the difference of wave spectrum Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. wave‐particle interaction RBSP results ECH waves Plasmasphere Sensors Density Probes Radiation belts Stability Dynamics Maxwellian distribution Magnetospheres Growth Scattering Magnetosphere Radiation Distribution Belts Cyclotrons Waves Radiations Plasmas Emission Frequency Frequencies Instability Space density Xiao, Fuliang oth Yang, Chang oth Liu, Si oth He, Yihua oth Baker, D. N oth Spence, H. E oth Reeves, G. D oth Funsten, H. O oth Enthalten in Geophysical research letters Washington, DC : Union, 1974 44(2017), 11, Seite 5251-5258 (DE-627)129095109 (DE-600)7403-2 (DE-576)01443122X 0094-8276 nnns volume:44 year:2017 number:11 pages:5251-5258 http://dx.doi.org/10.1002/2017GL073051 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017GL073051/abstract https://search.proquest.com/docview/1913910113 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_47 GBV_ILN_62 GBV_ILN_154 GBV_ILN_601 GBV_ILN_2279 38.70 AVZ AR 44 2017 11 5251-5258 |
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Zhou, Qinghua @@aut@@ Xiao, Fuliang @@oth@@ Yang, Chang @@oth@@ Liu, Si @@oth@@ He, Yihua @@oth@@ Baker, D. N @@oth@@ Spence, H. E @@oth@@ Reeves, G. D @@oth@@ Funsten, H. O @@oth@@ |
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Zhou, Qinghua |
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Zhou, Qinghua ddc 550 bkl 38.70 misc wave‐particle interaction misc RBSP results misc ECH waves misc Plasmasphere misc Sensors misc Density misc Probes misc Radiation belts misc Stability misc Dynamics misc Maxwellian distribution misc Magnetospheres misc Growth misc Scattering misc Magnetosphere misc Radiation misc Distribution misc Belts misc Cyclotrons misc Waves misc Radiations misc Plasmas misc Emission misc Frequency misc Frequencies misc Instability misc Space density Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts |
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550 DNB 38.70 bkl Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts wave‐particle interaction RBSP results ECH waves Plasmasphere Sensors Density Probes Radiation belts Stability Dynamics Maxwellian distribution Magnetospheres Growth Scattering Magnetosphere Radiation Distribution Belts Cyclotrons Waves Radiations Plasmas Emission Frequency Frequencies Instability Space density |
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ddc 550 bkl 38.70 misc wave‐particle interaction misc RBSP results misc ECH waves misc Plasmasphere misc Sensors misc Density misc Probes misc Radiation belts misc Stability misc Dynamics misc Maxwellian distribution misc Magnetospheres misc Growth misc Scattering misc Magnetosphere misc Radiation misc Distribution misc Belts misc Cyclotrons misc Waves misc Radiations misc Plasmas misc Emission misc Frequency misc Frequencies misc Instability misc Space density |
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Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts |
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Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts |
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generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the van allen radiation belts |
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Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts |
| abstract |
Electrostatic electron cyclotron harmonic (ECH) waves generated by the electron loss cone distribution can produce efficient scattering loss of plasma sheet electrons, which has a significant effect on the dynamics in the outer magnetosphere. Here we report two ECH emission events around the same location L ≈ 5.7–5.8, MLT ≈ 12 from Van Allen Probes on 11 February (event A) and 9 January 2014 (event B), respectively. The spectrum of ECH waves was centered at the lower half of the harmonic bands during event A, but the upper half during event B. The observed electron phase space density in both events is fitted by the subtracted bi‐Maxwellian distribution, and the fitting functions are used to evaluate the local growth rates of ECH waves based on a linear theory for homogeneous plasmas. ECH waves are excited by the loss cone instability of 50 eV–1 keV electrons in the lower half of harmonic bands in the low‐density plasmasphere in event A, and 1–10 keV electrons in the upper half of harmonic bands in a relatively high‐density region in event B. The current results successfully explain observations and provide a first direct evidence on how ECH waves are generated in the lower and upper half of harmonic frequency bands. Initial data reported on two ECH wave events around the same location but in the different frequency band Numerical simulations show that ECH waves can be generated in the different half of harmonic frequency bands The background density and electron temperature are the main factors to yield the difference of wave spectrum |
| abstractGer |
Electrostatic electron cyclotron harmonic (ECH) waves generated by the electron loss cone distribution can produce efficient scattering loss of plasma sheet electrons, which has a significant effect on the dynamics in the outer magnetosphere. Here we report two ECH emission events around the same location L ≈ 5.7–5.8, MLT ≈ 12 from Van Allen Probes on 11 February (event A) and 9 January 2014 (event B), respectively. The spectrum of ECH waves was centered at the lower half of the harmonic bands during event A, but the upper half during event B. The observed electron phase space density in both events is fitted by the subtracted bi‐Maxwellian distribution, and the fitting functions are used to evaluate the local growth rates of ECH waves based on a linear theory for homogeneous plasmas. ECH waves are excited by the loss cone instability of 50 eV–1 keV electrons in the lower half of harmonic bands in the low‐density plasmasphere in event A, and 1–10 keV electrons in the upper half of harmonic bands in a relatively high‐density region in event B. The current results successfully explain observations and provide a first direct evidence on how ECH waves are generated in the lower and upper half of harmonic frequency bands. Initial data reported on two ECH wave events around the same location but in the different frequency band Numerical simulations show that ECH waves can be generated in the different half of harmonic frequency bands The background density and electron temperature are the main factors to yield the difference of wave spectrum |
| abstract_unstemmed |
Electrostatic electron cyclotron harmonic (ECH) waves generated by the electron loss cone distribution can produce efficient scattering loss of plasma sheet electrons, which has a significant effect on the dynamics in the outer magnetosphere. Here we report two ECH emission events around the same location L ≈ 5.7–5.8, MLT ≈ 12 from Van Allen Probes on 11 February (event A) and 9 January 2014 (event B), respectively. The spectrum of ECH waves was centered at the lower half of the harmonic bands during event A, but the upper half during event B. The observed electron phase space density in both events is fitted by the subtracted bi‐Maxwellian distribution, and the fitting functions are used to evaluate the local growth rates of ECH waves based on a linear theory for homogeneous plasmas. ECH waves are excited by the loss cone instability of 50 eV–1 keV electrons in the lower half of harmonic bands in the low‐density plasmasphere in event A, and 1–10 keV electrons in the upper half of harmonic bands in a relatively high‐density region in event B. The current results successfully explain observations and provide a first direct evidence on how ECH waves are generated in the lower and upper half of harmonic frequency bands. Initial data reported on two ECH wave events around the same location but in the different frequency band Numerical simulations show that ECH waves can be generated in the different half of harmonic frequency bands The background density and electron temperature are the main factors to yield the difference of wave spectrum |
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| title_short |
Generation of lower and upper bands of electrostatic electron cyclotron harmonic waves in the Van Allen radiation belts |
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http://dx.doi.org/10.1002/2017GL073051 http://onlinelibrary.wiley.com/doi/10.1002/2017GL073051/abstract https://search.proquest.com/docview/1913910113 |
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Xiao, Fuliang Yang, Chang Liu, Si He, Yihua Baker, D. N Spence, H. E Reeves, G. D Funsten, H. O |
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Here we report two ECH emission events around the same location L ≈ 5.7–5.8, MLT ≈ 12 from Van Allen Probes on 11 February (event A) and 9 January 2014 (event B), respectively. The spectrum of ECH waves was centered at the lower half of the harmonic bands during event A, but the upper half during event B. The observed electron phase space density in both events is fitted by the subtracted bi‐Maxwellian distribution, and the fitting functions are used to evaluate the local growth rates of ECH waves based on a linear theory for homogeneous plasmas. ECH waves are excited by the loss cone instability of 50 eV–1 keV electrons in the lower half of harmonic bands in the low‐density plasmasphere in event A, and 1–10 keV electrons in the upper half of harmonic bands in a relatively high‐density region in event B. The current results successfully explain observations and provide a first direct evidence on how ECH waves are generated in the lower and upper half of harmonic frequency bands. Initial data reported on two ECH wave events around the same location but in the different frequency band Numerical simulations show that ECH waves can be generated in the different half of harmonic frequency bands The background density and electron temperature are the main factors to yield the difference of wave spectrum</subfield></datafield><datafield tag="540" ind1=" " ind2=" "><subfield code="a">Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">wave‐particle interaction</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">RBSP results</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">ECH waves</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Plasmasphere</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Sensors</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Density</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Probes</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Radiation belts</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Stability</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Dynamics</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Maxwellian distribution</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Magnetospheres</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Growth</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Scattering</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Magnetosphere</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Radiation</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Distribution</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Belts</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Cyclotrons</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Waves</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Radiations</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Plasmas</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Emission</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Frequency</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Frequencies</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Instability</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Space density</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Xiao, Fuliang</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Yang, Chang</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Liu, Si</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">He, Yihua</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Baker, D. 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