On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling

In a recent paper (Luo H et al., 2022), we found that the peak amplitudes of diurnal magnetic variations, measured during martian days (sols) at the InSight landing site, exhibited quasi Carrington-Rotation (qCR) periods at higher eigenmodes of the natural orthogonal components (NOC); these results...
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Autor*in:	Hao Luo [verfasserIn] AiMin Du [verfasserIn] ShaoHua Zhang [verfasserIn] YaSong Ge [verfasserIn] Ying Zhang [verfasserIn] ShuQuan Sun [verfasserIn] Lin Zhao [verfasserIn] Lin Tian [verfasserIn] SongYan Li [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2022

Schlagwörter:	insight sol magnetic variations carrington rotation (cr) periodicity

Übergeordnetes Werk:	In: Earth and Planetary Physics - Science Press, 2022, 6(2022), 3, Seite 275-283
Übergeordnetes Werk:	volume:6 ; year:2022 ; number:3 ; pages:275-283

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.26464/epp2022022

Katalog-ID:	DOAJ025077171

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allfields	10.26464/epp2022022 doi (DE-627)DOAJ025077171 (DE-599)DOAJ9de8f26f5ca64040b9667fe06dbf0531 DE-627 ger DE-627 rakwb eng QC801-809 GE1-350 Hao Luo verfasserin aut On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In a recent paper (Luo H et al., 2022), we found that the peak amplitudes of diurnal magnetic variations, measured during martian days (sols) at the InSight landing site, exhibited quasi Carrington-Rotation (qCR) periods at higher eigenmodes of the natural orthogonal components (NOC); these results were based on ~664 sols of magnetic field measurements. However, the source of these periodic variations is still unknown. In this paper we introduce the neutral-wind driven ionospheric dynamo current model (e.g., Lillis et al., 2019) to investigate the source. Four candidates — the draped IMF, electron density/plasma density, the neutral densities, and the electron temperature in the ionosphere with artificial qCR periodicity, are applied in the modeling to find the main factor likely to be causing the observed surface magnetic field variations that exhibit the same qCR periods. Results show that the electron density/plasma density, which controls the total conductivity in the dynamo region, appears to account for the greatest part of the surface qCR variations; its contribution reaches about 67.6%. The draped IMF, the neutral densities, and the electron temperature account, respectively, for only about 12.9%, 10.3%, and 9.2% of the variations. Our study implies that the qCR magnetic variations on the Martian surface are due primarily to variations of the dynamo currents caused by the electron density variations. We suggest also that the time-varying fields with the qCR period could be used to probe the Martian interior's electrical conductivity structure to a depth of at least 700 km. insight sol magnetic variations carrington rotation (cr) periodicity Science Q Geophysics. Cosmic physics Environmental sciences AiMin Du verfasserin aut ShaoHua Zhang verfasserin aut YaSong Ge verfasserin aut Ying Zhang verfasserin aut ShuQuan Sun verfasserin aut Lin Zhao verfasserin aut Lin Tian verfasserin aut SongYan Li verfasserin aut In Earth and Planetary Physics Science Press, 2022 6(2022), 3, Seite 275-283 (DE-627)1017742499 20963955 nnns volume:6 year:2022 number:3 pages:275-283 https://doi.org/10.26464/epp2022022 kostenfrei https://doaj.org/article/9de8f26f5ca64040b9667fe06dbf0531 kostenfrei http://www.eppcgs.org/article/doi/10.26464/epp2022022?pageType=en kostenfrei https://doaj.org/toc/2096-3955 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_266 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2031 GBV_ILN_2037 GBV_ILN_2039 GBV_ILN_2059 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2232 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 6 2022 3 275-283
spelling	10.26464/epp2022022 doi (DE-627)DOAJ025077171 (DE-599)DOAJ9de8f26f5ca64040b9667fe06dbf0531 DE-627 ger DE-627 rakwb eng QC801-809 GE1-350 Hao Luo verfasserin aut On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In a recent paper (Luo H et al., 2022), we found that the peak amplitudes of diurnal magnetic variations, measured during martian days (sols) at the InSight landing site, exhibited quasi Carrington-Rotation (qCR) periods at higher eigenmodes of the natural orthogonal components (NOC); these results were based on ~664 sols of magnetic field measurements. However, the source of these periodic variations is still unknown. In this paper we introduce the neutral-wind driven ionospheric dynamo current model (e.g., Lillis et al., 2019) to investigate the source. Four candidates — the draped IMF, electron density/plasma density, the neutral densities, and the electron temperature in the ionosphere with artificial qCR periodicity, are applied in the modeling to find the main factor likely to be causing the observed surface magnetic field variations that exhibit the same qCR periods. Results show that the electron density/plasma density, which controls the total conductivity in the dynamo region, appears to account for the greatest part of the surface qCR variations; its contribution reaches about 67.6%. The draped IMF, the neutral densities, and the electron temperature account, respectively, for only about 12.9%, 10.3%, and 9.2% of the variations. Our study implies that the qCR magnetic variations on the Martian surface are due primarily to variations of the dynamo currents caused by the electron density variations. We suggest also that the time-varying fields with the qCR period could be used to probe the Martian interior's electrical conductivity structure to a depth of at least 700 km. insight sol magnetic variations carrington rotation (cr) periodicity Science Q Geophysics. Cosmic physics Environmental sciences AiMin Du verfasserin aut ShaoHua Zhang verfasserin aut YaSong Ge verfasserin aut Ying Zhang verfasserin aut ShuQuan Sun verfasserin aut Lin Zhao verfasserin aut Lin Tian verfasserin aut SongYan Li verfasserin aut In Earth and Planetary Physics Science Press, 2022 6(2022), 3, Seite 275-283 (DE-627)1017742499 20963955 nnns volume:6 year:2022 number:3 pages:275-283 https://doi.org/10.26464/epp2022022 kostenfrei https://doaj.org/article/9de8f26f5ca64040b9667fe06dbf0531 kostenfrei http://www.eppcgs.org/article/doi/10.26464/epp2022022?pageType=en kostenfrei https://doaj.org/toc/2096-3955 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_266 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2031 GBV_ILN_2037 GBV_ILN_2039 GBV_ILN_2059 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2232 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 6 2022 3 275-283
allfields_unstemmed	10.26464/epp2022022 doi (DE-627)DOAJ025077171 (DE-599)DOAJ9de8f26f5ca64040b9667fe06dbf0531 DE-627 ger DE-627 rakwb eng QC801-809 GE1-350 Hao Luo verfasserin aut On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In a recent paper (Luo H et al., 2022), we found that the peak amplitudes of diurnal magnetic variations, measured during martian days (sols) at the InSight landing site, exhibited quasi Carrington-Rotation (qCR) periods at higher eigenmodes of the natural orthogonal components (NOC); these results were based on ~664 sols of magnetic field measurements. However, the source of these periodic variations is still unknown. In this paper we introduce the neutral-wind driven ionospheric dynamo current model (e.g., Lillis et al., 2019) to investigate the source. Four candidates — the draped IMF, electron density/plasma density, the neutral densities, and the electron temperature in the ionosphere with artificial qCR periodicity, are applied in the modeling to find the main factor likely to be causing the observed surface magnetic field variations that exhibit the same qCR periods. Results show that the electron density/plasma density, which controls the total conductivity in the dynamo region, appears to account for the greatest part of the surface qCR variations; its contribution reaches about 67.6%. The draped IMF, the neutral densities, and the electron temperature account, respectively, for only about 12.9%, 10.3%, and 9.2% of the variations. Our study implies that the qCR magnetic variations on the Martian surface are due primarily to variations of the dynamo currents caused by the electron density variations. We suggest also that the time-varying fields with the qCR period could be used to probe the Martian interior's electrical conductivity structure to a depth of at least 700 km. insight sol magnetic variations carrington rotation (cr) periodicity Science Q Geophysics. Cosmic physics Environmental sciences AiMin Du verfasserin aut ShaoHua Zhang verfasserin aut YaSong Ge verfasserin aut Ying Zhang verfasserin aut ShuQuan Sun verfasserin aut Lin Zhao verfasserin aut Lin Tian verfasserin aut SongYan Li verfasserin aut In Earth and Planetary Physics Science Press, 2022 6(2022), 3, Seite 275-283 (DE-627)1017742499 20963955 nnns volume:6 year:2022 number:3 pages:275-283 https://doi.org/10.26464/epp2022022 kostenfrei https://doaj.org/article/9de8f26f5ca64040b9667fe06dbf0531 kostenfrei http://www.eppcgs.org/article/doi/10.26464/epp2022022?pageType=en kostenfrei https://doaj.org/toc/2096-3955 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_266 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2031 GBV_ILN_2037 GBV_ILN_2039 GBV_ILN_2059 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2232 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 6 2022 3 275-283
allfieldsGer	10.26464/epp2022022 doi (DE-627)DOAJ025077171 (DE-599)DOAJ9de8f26f5ca64040b9667fe06dbf0531 DE-627 ger DE-627 rakwb eng QC801-809 GE1-350 Hao Luo verfasserin aut On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In a recent paper (Luo H et al., 2022), we found that the peak amplitudes of diurnal magnetic variations, measured during martian days (sols) at the InSight landing site, exhibited quasi Carrington-Rotation (qCR) periods at higher eigenmodes of the natural orthogonal components (NOC); these results were based on ~664 sols of magnetic field measurements. However, the source of these periodic variations is still unknown. In this paper we introduce the neutral-wind driven ionospheric dynamo current model (e.g., Lillis et al., 2019) to investigate the source. Four candidates — the draped IMF, electron density/plasma density, the neutral densities, and the electron temperature in the ionosphere with artificial qCR periodicity, are applied in the modeling to find the main factor likely to be causing the observed surface magnetic field variations that exhibit the same qCR periods. Results show that the electron density/plasma density, which controls the total conductivity in the dynamo region, appears to account for the greatest part of the surface qCR variations; its contribution reaches about 67.6%. The draped IMF, the neutral densities, and the electron temperature account, respectively, for only about 12.9%, 10.3%, and 9.2% of the variations. Our study implies that the qCR magnetic variations on the Martian surface are due primarily to variations of the dynamo currents caused by the electron density variations. We suggest also that the time-varying fields with the qCR period could be used to probe the Martian interior's electrical conductivity structure to a depth of at least 700 km. insight sol magnetic variations carrington rotation (cr) periodicity Science Q Geophysics. Cosmic physics Environmental sciences AiMin Du verfasserin aut ShaoHua Zhang verfasserin aut YaSong Ge verfasserin aut Ying Zhang verfasserin aut ShuQuan Sun verfasserin aut Lin Zhao verfasserin aut Lin Tian verfasserin aut SongYan Li verfasserin aut In Earth and Planetary Physics Science Press, 2022 6(2022), 3, Seite 275-283 (DE-627)1017742499 20963955 nnns volume:6 year:2022 number:3 pages:275-283 https://doi.org/10.26464/epp2022022 kostenfrei https://doaj.org/article/9de8f26f5ca64040b9667fe06dbf0531 kostenfrei http://www.eppcgs.org/article/doi/10.26464/epp2022022?pageType=en kostenfrei https://doaj.org/toc/2096-3955 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_266 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2031 GBV_ILN_2037 GBV_ILN_2039 GBV_ILN_2059 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2232 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 6 2022 3 275-283
allfieldsSound	10.26464/epp2022022 doi (DE-627)DOAJ025077171 (DE-599)DOAJ9de8f26f5ca64040b9667fe06dbf0531 DE-627 ger DE-627 rakwb eng QC801-809 GE1-350 Hao Luo verfasserin aut On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In a recent paper (Luo H et al., 2022), we found that the peak amplitudes of diurnal magnetic variations, measured during martian days (sols) at the InSight landing site, exhibited quasi Carrington-Rotation (qCR) periods at higher eigenmodes of the natural orthogonal components (NOC); these results were based on ~664 sols of magnetic field measurements. However, the source of these periodic variations is still unknown. In this paper we introduce the neutral-wind driven ionospheric dynamo current model (e.g., Lillis et al., 2019) to investigate the source. Four candidates — the draped IMF, electron density/plasma density, the neutral densities, and the electron temperature in the ionosphere with artificial qCR periodicity, are applied in the modeling to find the main factor likely to be causing the observed surface magnetic field variations that exhibit the same qCR periods. Results show that the electron density/plasma density, which controls the total conductivity in the dynamo region, appears to account for the greatest part of the surface qCR variations; its contribution reaches about 67.6%. The draped IMF, the neutral densities, and the electron temperature account, respectively, for only about 12.9%, 10.3%, and 9.2% of the variations. Our study implies that the qCR magnetic variations on the Martian surface are due primarily to variations of the dynamo currents caused by the electron density variations. We suggest also that the time-varying fields with the qCR period could be used to probe the Martian interior's electrical conductivity structure to a depth of at least 700 km. insight sol magnetic variations carrington rotation (cr) periodicity Science Q Geophysics. Cosmic physics Environmental sciences AiMin Du verfasserin aut ShaoHua Zhang verfasserin aut YaSong Ge verfasserin aut Ying Zhang verfasserin aut ShuQuan Sun verfasserin aut Lin Zhao verfasserin aut Lin Tian verfasserin aut SongYan Li verfasserin aut In Earth and Planetary Physics Science Press, 2022 6(2022), 3, Seite 275-283 (DE-627)1017742499 20963955 nnns volume:6 year:2022 number:3 pages:275-283 https://doi.org/10.26464/epp2022022 kostenfrei https://doaj.org/article/9de8f26f5ca64040b9667fe06dbf0531 kostenfrei http://www.eppcgs.org/article/doi/10.26464/epp2022022?pageType=en kostenfrei https://doaj.org/toc/2096-3955 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_266 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2031 GBV_ILN_2037 GBV_ILN_2039 GBV_ILN_2059 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2232 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 6 2022 3 275-283
language	English
source	In Earth and Planetary Physics 6(2022), 3, Seite 275-283 volume:6 year:2022 number:3 pages:275-283
sourceStr	In Earth and Planetary Physics 6(2022), 3, Seite 275-283 volume:6 year:2022 number:3 pages:275-283
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	insight sol magnetic variations carrington rotation (cr) periodicity Science Q Geophysics. Cosmic physics Environmental sciences
isfreeaccess_bool	true
container_title	Earth and Planetary Physics
authorswithroles_txt_mv	Hao Luo @@aut@@ AiMin Du @@aut@@ ShaoHua Zhang @@aut@@ YaSong Ge @@aut@@ Ying Zhang @@aut@@ ShuQuan Sun @@aut@@ Lin Zhao @@aut@@ Lin Tian @@aut@@ SongYan Li @@aut@@
publishDateDaySort_date	2022-01-01T00:00:00Z
hierarchy_top_id	1017742499
id	DOAJ025077171
language_de	englisch
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callnumber-first	Q - Science
author	Hao Luo
spellingShingle	Hao Luo misc QC801-809 misc GE1-350 misc insight misc sol magnetic variations misc carrington rotation (cr) periodicity misc Science misc Q misc Geophysics. Cosmic physics misc Environmental sciences On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling
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topic_title	QC801-809 GE1-350 On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling insight sol magnetic variations carrington rotation (cr) periodicity
topic	misc QC801-809 misc GE1-350 misc insight misc sol magnetic variations misc carrington rotation (cr) periodicity misc Science misc Q misc Geophysics. Cosmic physics misc Environmental sciences
topic_unstemmed	misc QC801-809 misc GE1-350 misc insight misc sol magnetic variations misc carrington rotation (cr) periodicity misc Science misc Q misc Geophysics. Cosmic physics misc Environmental sciences
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title	On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling
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title_full	On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling
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author_browse	Hao Luo AiMin Du ShaoHua Zhang YaSong Ge Ying Zhang ShuQuan Sun Lin Zhao Lin Tian SongYan Li
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title_sort	on the source of the quasi-carrington rotation periodic magnetic variations on the martian surface: insight observations and modeling
callnumber	QC801-809
title_auth	On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling
abstract	In a recent paper (Luo H et al., 2022), we found that the peak amplitudes of diurnal magnetic variations, measured during martian days (sols) at the InSight landing site, exhibited quasi Carrington-Rotation (qCR) periods at higher eigenmodes of the natural orthogonal components (NOC); these results were based on ~664 sols of magnetic field measurements. However, the source of these periodic variations is still unknown. In this paper we introduce the neutral-wind driven ionospheric dynamo current model (e.g., Lillis et al., 2019) to investigate the source. Four candidates — the draped IMF, electron density/plasma density, the neutral densities, and the electron temperature in the ionosphere with artificial qCR periodicity, are applied in the modeling to find the main factor likely to be causing the observed surface magnetic field variations that exhibit the same qCR periods. Results show that the electron density/plasma density, which controls the total conductivity in the dynamo region, appears to account for the greatest part of the surface qCR variations; its contribution reaches about 67.6%. The draped IMF, the neutral densities, and the electron temperature account, respectively, for only about 12.9%, 10.3%, and 9.2% of the variations. Our study implies that the qCR magnetic variations on the Martian surface are due primarily to variations of the dynamo currents caused by the electron density variations. We suggest also that the time-varying fields with the qCR period could be used to probe the Martian interior's electrical conductivity structure to a depth of at least 700 km.
abstractGer	In a recent paper (Luo H et al., 2022), we found that the peak amplitudes of diurnal magnetic variations, measured during martian days (sols) at the InSight landing site, exhibited quasi Carrington-Rotation (qCR) periods at higher eigenmodes of the natural orthogonal components (NOC); these results were based on ~664 sols of magnetic field measurements. However, the source of these periodic variations is still unknown. In this paper we introduce the neutral-wind driven ionospheric dynamo current model (e.g., Lillis et al., 2019) to investigate the source. Four candidates — the draped IMF, electron density/plasma density, the neutral densities, and the electron temperature in the ionosphere with artificial qCR periodicity, are applied in the modeling to find the main factor likely to be causing the observed surface magnetic field variations that exhibit the same qCR periods. Results show that the electron density/plasma density, which controls the total conductivity in the dynamo region, appears to account for the greatest part of the surface qCR variations; its contribution reaches about 67.6%. The draped IMF, the neutral densities, and the electron temperature account, respectively, for only about 12.9%, 10.3%, and 9.2% of the variations. Our study implies that the qCR magnetic variations on the Martian surface are due primarily to variations of the dynamo currents caused by the electron density variations. We suggest also that the time-varying fields with the qCR period could be used to probe the Martian interior's electrical conductivity structure to a depth of at least 700 km.
abstract_unstemmed	In a recent paper (Luo H et al., 2022), we found that the peak amplitudes of diurnal magnetic variations, measured during martian days (sols) at the InSight landing site, exhibited quasi Carrington-Rotation (qCR) periods at higher eigenmodes of the natural orthogonal components (NOC); these results were based on ~664 sols of magnetic field measurements. However, the source of these periodic variations is still unknown. In this paper we introduce the neutral-wind driven ionospheric dynamo current model (e.g., Lillis et al., 2019) to investigate the source. Four candidates — the draped IMF, electron density/plasma density, the neutral densities, and the electron temperature in the ionosphere with artificial qCR periodicity, are applied in the modeling to find the main factor likely to be causing the observed surface magnetic field variations that exhibit the same qCR periods. Results show that the electron density/plasma density, which controls the total conductivity in the dynamo region, appears to account for the greatest part of the surface qCR variations; its contribution reaches about 67.6%. The draped IMF, the neutral densities, and the electron temperature account, respectively, for only about 12.9%, 10.3%, and 9.2% of the variations. Our study implies that the qCR magnetic variations on the Martian surface are due primarily to variations of the dynamo currents caused by the electron density variations. We suggest also that the time-varying fields with the qCR period could be used to probe the Martian interior's electrical conductivity structure to a depth of at least 700 km.
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title_short	On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling
url	https://doi.org/10.26464/epp2022022 https://doaj.org/article/9de8f26f5ca64040b9667fe06dbf0531 http://www.eppcgs.org/article/doi/10.26464/epp2022022?pageType=en https://doaj.org/toc/2096-3955
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On the source of the quasi-Carrington Rotation periodic magnetic variations on the Martian surface: InSight observations and modeling

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