Multi-instrument ground-based observations of a travelling convection vortices event
Abstract A coordinated ground-based observational campaign using the IMAGE magnetometer network, EISCAT radars and optical instruments on Svalbard has made possible detailed studies of a travelling convection vortices (TCV) event on 6 January 1992. Combining the data from these facilities allows us...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Lühr, H. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1996 |
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| Schlagwörter: |
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| Anmerkung: |
© Springer-Verlag Berlin Heidelberg 1996 |
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| Übergeordnetes Werk: |
Enthalten in: Annales geophysicae - Springer-Verlag, 1983, 14(1996), 2 vom: Feb., Seite 162-181 |
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| Übergeordnetes Werk: |
volume:14 ; year:1996 ; number:2 ; month:02 ; pages:162-181 |
| Links: |
|---|
| DOI / URN: |
10.1007/s00585-996-0162-z |
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OLC207177941X |
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| 520 | |a Abstract A coordinated ground-based observational campaign using the IMAGE magnetometer network, EISCAT radars and optical instruments on Svalbard has made possible detailed studies of a travelling convection vortices (TCV) event on 6 January 1992. Combining the data from these facilities allows us to draw a very detailed picture of the features and dynamics of this TCV event. On the way from the noon to the drawn meridian, the vortices went through a remarkable development. The propagation velocity in the ionosphere increased from 2.5 to 7.4 km $ s^{−1} $, and the orientation of the major axes of the vortices rotated from being almost parallel to the magnetic meridian near noon to essentially perpendicular at dawn. By combining electric fields obtained by EISCAT and ionospheric currents deduced from magnetic field recordings, conductivities associated with the vortices could be estimated. Contrary to expectations we found higher conductivities below the downward field aligned current (FAC) filament than below the upward directed. Unexpected results also emerged from the optical observations. For most of the time there were no discrete aurora at 557.7 nm associated with the TCVs. Only once did a discrete form appear at the foot of the upward FAC. This aurora subsequently expanded eastward and westward leaving its centre at the same longitude while the TCV continued to travel westward. Also we try to identify the source regions of TCVs in the magnetosphere and discuss possible generation mechanisms. | ||
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| 700 | 1 | |a Lockwood, M. |4 aut | |
| 700 | 1 | |a Sandholt, P. E. |4 aut | |
| 700 | 1 | |a Hansen, T. L. |4 aut | |
| 700 | 1 | |a Moretto, T. |4 aut | |
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10.1007/s00585-996-0162-z doi (DE-627)OLC207177941X (DE-He213)s00585-996-0162-z-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Lühr, H. verfasserin aut Multi-instrument ground-based observations of a travelling convection vortices event 1996 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1996 Abstract A coordinated ground-based observational campaign using the IMAGE magnetometer network, EISCAT radars and optical instruments on Svalbard has made possible detailed studies of a travelling convection vortices (TCV) event on 6 January 1992. Combining the data from these facilities allows us to draw a very detailed picture of the features and dynamics of this TCV event. On the way from the noon to the drawn meridian, the vortices went through a remarkable development. The propagation velocity in the ionosphere increased from 2.5 to 7.4 km $ s^{−1} $, and the orientation of the major axes of the vortices rotated from being almost parallel to the magnetic meridian near noon to essentially perpendicular at dawn. By combining electric fields obtained by EISCAT and ionospheric currents deduced from magnetic field recordings, conductivities associated with the vortices could be estimated. Contrary to expectations we found higher conductivities below the downward field aligned current (FAC) filament than below the upward directed. Unexpected results also emerged from the optical observations. For most of the time there were no discrete aurora at 557.7 nm associated with the TCVs. Only once did a discrete form appear at the foot of the upward FAC. This aurora subsequently expanded eastward and westward leaving its centre at the same longitude while the TCV continued to travel westward. Also we try to identify the source regions of TCVs in the magnetosphere and discuss possible generation mechanisms. Discrete Form Optical Observation Optical Instrument Field Recording Field Align Current Lockwood, M. aut Sandholt, P. E. aut Hansen, T. L. aut Moretto, T. aut Enthalten in Annales geophysicae Springer-Verlag, 1983 14(1996), 2 vom: Feb., Seite 162-181 (DE-627)129620742 (DE-600)246086-5 (DE-576)01512696X 0992-7689 nnns volume:14 year:1996 number:2 month:02 pages:162-181 https://doi.org/10.1007/s00585-996-0162-z lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_47 GBV_ILN_62 GBV_ILN_70 GBV_ILN_154 GBV_ILN_267 GBV_ILN_601 GBV_ILN_2008 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_4012 GBV_ILN_4027 GBV_ILN_4038 GBV_ILN_4103 GBV_ILN_4277 GBV_ILN_4309 GBV_ILN_4317 AR 14 1996 2 02 162-181 |
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10.1007/s00585-996-0162-z doi (DE-627)OLC207177941X (DE-He213)s00585-996-0162-z-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Lühr, H. verfasserin aut Multi-instrument ground-based observations of a travelling convection vortices event 1996 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1996 Abstract A coordinated ground-based observational campaign using the IMAGE magnetometer network, EISCAT radars and optical instruments on Svalbard has made possible detailed studies of a travelling convection vortices (TCV) event on 6 January 1992. Combining the data from these facilities allows us to draw a very detailed picture of the features and dynamics of this TCV event. On the way from the noon to the drawn meridian, the vortices went through a remarkable development. The propagation velocity in the ionosphere increased from 2.5 to 7.4 km $ s^{−1} $, and the orientation of the major axes of the vortices rotated from being almost parallel to the magnetic meridian near noon to essentially perpendicular at dawn. By combining electric fields obtained by EISCAT and ionospheric currents deduced from magnetic field recordings, conductivities associated with the vortices could be estimated. Contrary to expectations we found higher conductivities below the downward field aligned current (FAC) filament than below the upward directed. Unexpected results also emerged from the optical observations. For most of the time there were no discrete aurora at 557.7 nm associated with the TCVs. Only once did a discrete form appear at the foot of the upward FAC. This aurora subsequently expanded eastward and westward leaving its centre at the same longitude while the TCV continued to travel westward. Also we try to identify the source regions of TCVs in the magnetosphere and discuss possible generation mechanisms. Discrete Form Optical Observation Optical Instrument Field Recording Field Align Current Lockwood, M. aut Sandholt, P. E. aut Hansen, T. L. aut Moretto, T. aut Enthalten in Annales geophysicae Springer-Verlag, 1983 14(1996), 2 vom: Feb., Seite 162-181 (DE-627)129620742 (DE-600)246086-5 (DE-576)01512696X 0992-7689 nnns volume:14 year:1996 number:2 month:02 pages:162-181 https://doi.org/10.1007/s00585-996-0162-z lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_47 GBV_ILN_62 GBV_ILN_70 GBV_ILN_154 GBV_ILN_267 GBV_ILN_601 GBV_ILN_2008 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_4012 GBV_ILN_4027 GBV_ILN_4038 GBV_ILN_4103 GBV_ILN_4277 GBV_ILN_4309 GBV_ILN_4317 AR 14 1996 2 02 162-181 |
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10.1007/s00585-996-0162-z doi (DE-627)OLC207177941X (DE-He213)s00585-996-0162-z-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Lühr, H. verfasserin aut Multi-instrument ground-based observations of a travelling convection vortices event 1996 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1996 Abstract A coordinated ground-based observational campaign using the IMAGE magnetometer network, EISCAT radars and optical instruments on Svalbard has made possible detailed studies of a travelling convection vortices (TCV) event on 6 January 1992. Combining the data from these facilities allows us to draw a very detailed picture of the features and dynamics of this TCV event. On the way from the noon to the drawn meridian, the vortices went through a remarkable development. The propagation velocity in the ionosphere increased from 2.5 to 7.4 km $ s^{−1} $, and the orientation of the major axes of the vortices rotated from being almost parallel to the magnetic meridian near noon to essentially perpendicular at dawn. By combining electric fields obtained by EISCAT and ionospheric currents deduced from magnetic field recordings, conductivities associated with the vortices could be estimated. Contrary to expectations we found higher conductivities below the downward field aligned current (FAC) filament than below the upward directed. Unexpected results also emerged from the optical observations. For most of the time there were no discrete aurora at 557.7 nm associated with the TCVs. Only once did a discrete form appear at the foot of the upward FAC. This aurora subsequently expanded eastward and westward leaving its centre at the same longitude while the TCV continued to travel westward. Also we try to identify the source regions of TCVs in the magnetosphere and discuss possible generation mechanisms. Discrete Form Optical Observation Optical Instrument Field Recording Field Align Current Lockwood, M. aut Sandholt, P. E. aut Hansen, T. L. aut Moretto, T. aut Enthalten in Annales geophysicae Springer-Verlag, 1983 14(1996), 2 vom: Feb., Seite 162-181 (DE-627)129620742 (DE-600)246086-5 (DE-576)01512696X 0992-7689 nnns volume:14 year:1996 number:2 month:02 pages:162-181 https://doi.org/10.1007/s00585-996-0162-z lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_47 GBV_ILN_62 GBV_ILN_70 GBV_ILN_154 GBV_ILN_267 GBV_ILN_601 GBV_ILN_2008 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_4012 GBV_ILN_4027 GBV_ILN_4038 GBV_ILN_4103 GBV_ILN_4277 GBV_ILN_4309 GBV_ILN_4317 AR 14 1996 2 02 162-181 |
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10.1007/s00585-996-0162-z doi (DE-627)OLC207177941X (DE-He213)s00585-996-0162-z-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Lühr, H. verfasserin aut Multi-instrument ground-based observations of a travelling convection vortices event 1996 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1996 Abstract A coordinated ground-based observational campaign using the IMAGE magnetometer network, EISCAT radars and optical instruments on Svalbard has made possible detailed studies of a travelling convection vortices (TCV) event on 6 January 1992. Combining the data from these facilities allows us to draw a very detailed picture of the features and dynamics of this TCV event. On the way from the noon to the drawn meridian, the vortices went through a remarkable development. The propagation velocity in the ionosphere increased from 2.5 to 7.4 km $ s^{−1} $, and the orientation of the major axes of the vortices rotated from being almost parallel to the magnetic meridian near noon to essentially perpendicular at dawn. By combining electric fields obtained by EISCAT and ionospheric currents deduced from magnetic field recordings, conductivities associated with the vortices could be estimated. Contrary to expectations we found higher conductivities below the downward field aligned current (FAC) filament than below the upward directed. Unexpected results also emerged from the optical observations. For most of the time there were no discrete aurora at 557.7 nm associated with the TCVs. Only once did a discrete form appear at the foot of the upward FAC. This aurora subsequently expanded eastward and westward leaving its centre at the same longitude while the TCV continued to travel westward. Also we try to identify the source regions of TCVs in the magnetosphere and discuss possible generation mechanisms. Discrete Form Optical Observation Optical Instrument Field Recording Field Align Current Lockwood, M. aut Sandholt, P. E. aut Hansen, T. L. aut Moretto, T. aut Enthalten in Annales geophysicae Springer-Verlag, 1983 14(1996), 2 vom: Feb., Seite 162-181 (DE-627)129620742 (DE-600)246086-5 (DE-576)01512696X 0992-7689 nnns volume:14 year:1996 number:2 month:02 pages:162-181 https://doi.org/10.1007/s00585-996-0162-z lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_47 GBV_ILN_62 GBV_ILN_70 GBV_ILN_154 GBV_ILN_267 GBV_ILN_601 GBV_ILN_2008 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_4012 GBV_ILN_4027 GBV_ILN_4038 GBV_ILN_4103 GBV_ILN_4277 GBV_ILN_4309 GBV_ILN_4317 AR 14 1996 2 02 162-181 |
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10.1007/s00585-996-0162-z doi (DE-627)OLC207177941X (DE-He213)s00585-996-0162-z-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Lühr, H. verfasserin aut Multi-instrument ground-based observations of a travelling convection vortices event 1996 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1996 Abstract A coordinated ground-based observational campaign using the IMAGE magnetometer network, EISCAT radars and optical instruments on Svalbard has made possible detailed studies of a travelling convection vortices (TCV) event on 6 January 1992. Combining the data from these facilities allows us to draw a very detailed picture of the features and dynamics of this TCV event. On the way from the noon to the drawn meridian, the vortices went through a remarkable development. The propagation velocity in the ionosphere increased from 2.5 to 7.4 km $ s^{−1} $, and the orientation of the major axes of the vortices rotated from being almost parallel to the magnetic meridian near noon to essentially perpendicular at dawn. By combining electric fields obtained by EISCAT and ionospheric currents deduced from magnetic field recordings, conductivities associated with the vortices could be estimated. Contrary to expectations we found higher conductivities below the downward field aligned current (FAC) filament than below the upward directed. Unexpected results also emerged from the optical observations. For most of the time there were no discrete aurora at 557.7 nm associated with the TCVs. Only once did a discrete form appear at the foot of the upward FAC. This aurora subsequently expanded eastward and westward leaving its centre at the same longitude while the TCV continued to travel westward. Also we try to identify the source regions of TCVs in the magnetosphere and discuss possible generation mechanisms. Discrete Form Optical Observation Optical Instrument Field Recording Field Align Current Lockwood, M. aut Sandholt, P. E. aut Hansen, T. L. aut Moretto, T. aut Enthalten in Annales geophysicae Springer-Verlag, 1983 14(1996), 2 vom: Feb., Seite 162-181 (DE-627)129620742 (DE-600)246086-5 (DE-576)01512696X 0992-7689 nnns volume:14 year:1996 number:2 month:02 pages:162-181 https://doi.org/10.1007/s00585-996-0162-z lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_47 GBV_ILN_62 GBV_ILN_70 GBV_ILN_154 GBV_ILN_267 GBV_ILN_601 GBV_ILN_2008 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_4012 GBV_ILN_4027 GBV_ILN_4038 GBV_ILN_4103 GBV_ILN_4277 GBV_ILN_4309 GBV_ILN_4317 AR 14 1996 2 02 162-181 |
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multi-instrument ground-based observations of a travelling convection vortices event |
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Multi-instrument ground-based observations of a travelling convection vortices event |
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Abstract A coordinated ground-based observational campaign using the IMAGE magnetometer network, EISCAT radars and optical instruments on Svalbard has made possible detailed studies of a travelling convection vortices (TCV) event on 6 January 1992. Combining the data from these facilities allows us to draw a very detailed picture of the features and dynamics of this TCV event. On the way from the noon to the drawn meridian, the vortices went through a remarkable development. The propagation velocity in the ionosphere increased from 2.5 to 7.4 km $ s^{−1} $, and the orientation of the major axes of the vortices rotated from being almost parallel to the magnetic meridian near noon to essentially perpendicular at dawn. By combining electric fields obtained by EISCAT and ionospheric currents deduced from magnetic field recordings, conductivities associated with the vortices could be estimated. Contrary to expectations we found higher conductivities below the downward field aligned current (FAC) filament than below the upward directed. Unexpected results also emerged from the optical observations. For most of the time there were no discrete aurora at 557.7 nm associated with the TCVs. Only once did a discrete form appear at the foot of the upward FAC. This aurora subsequently expanded eastward and westward leaving its centre at the same longitude while the TCV continued to travel westward. Also we try to identify the source regions of TCVs in the magnetosphere and discuss possible generation mechanisms. © Springer-Verlag Berlin Heidelberg 1996 |
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Abstract A coordinated ground-based observational campaign using the IMAGE magnetometer network, EISCAT radars and optical instruments on Svalbard has made possible detailed studies of a travelling convection vortices (TCV) event on 6 January 1992. Combining the data from these facilities allows us to draw a very detailed picture of the features and dynamics of this TCV event. On the way from the noon to the drawn meridian, the vortices went through a remarkable development. The propagation velocity in the ionosphere increased from 2.5 to 7.4 km $ s^{−1} $, and the orientation of the major axes of the vortices rotated from being almost parallel to the magnetic meridian near noon to essentially perpendicular at dawn. By combining electric fields obtained by EISCAT and ionospheric currents deduced from magnetic field recordings, conductivities associated with the vortices could be estimated. Contrary to expectations we found higher conductivities below the downward field aligned current (FAC) filament than below the upward directed. Unexpected results also emerged from the optical observations. For most of the time there were no discrete aurora at 557.7 nm associated with the TCVs. Only once did a discrete form appear at the foot of the upward FAC. This aurora subsequently expanded eastward and westward leaving its centre at the same longitude while the TCV continued to travel westward. Also we try to identify the source regions of TCVs in the magnetosphere and discuss possible generation mechanisms. © Springer-Verlag Berlin Heidelberg 1996 |
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Abstract A coordinated ground-based observational campaign using the IMAGE magnetometer network, EISCAT radars and optical instruments on Svalbard has made possible detailed studies of a travelling convection vortices (TCV) event on 6 January 1992. Combining the data from these facilities allows us to draw a very detailed picture of the features and dynamics of this TCV event. On the way from the noon to the drawn meridian, the vortices went through a remarkable development. The propagation velocity in the ionosphere increased from 2.5 to 7.4 km $ s^{−1} $, and the orientation of the major axes of the vortices rotated from being almost parallel to the magnetic meridian near noon to essentially perpendicular at dawn. By combining electric fields obtained by EISCAT and ionospheric currents deduced from magnetic field recordings, conductivities associated with the vortices could be estimated. Contrary to expectations we found higher conductivities below the downward field aligned current (FAC) filament than below the upward directed. Unexpected results also emerged from the optical observations. For most of the time there were no discrete aurora at 557.7 nm associated with the TCVs. Only once did a discrete form appear at the foot of the upward FAC. This aurora subsequently expanded eastward and westward leaving its centre at the same longitude while the TCV continued to travel westward. Also we try to identify the source regions of TCVs in the magnetosphere and discuss possible generation mechanisms. © Springer-Verlag Berlin Heidelberg 1996 |
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