Simultaneous optical and radar signatures of poleward-moving auroral forms
Dayside poleward moving auroral forms (PMAFs) were detected between 06:30 and 07:00 UT on December 16, 1998, by the meridian scanning photometer and the all-sky camera at Ny Ålesund, Svalbard. Simultaneous SuperDARN HF radar measurements permitted the study of the associated ionospheric velocity pat...
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ftsouthampton:oai:eprints.soton.ac.uk:9182 2024-06-09T07:48:42+00:00 Simultaneous optical and radar signatures of poleward-moving auroral forms Thorolfsson, A. Cerisier, J.-C. Lockwood, M. Sandholt, P.E. Senior, C. Lester, M. 2000 https://eprints.soton.ac.uk/9182/ http://www.copernicus.org/EGU/annales/18/1054.htm unknown Thorolfsson, A., Cerisier, J.-C., Lockwood, M., Sandholt, P.E., Senior, C. and Lester, M. (2000) Simultaneous optical and radar signatures of poleward-moving auroral forms. Annales Geophysicae, 18, 1054-1066. Article PeerReviewed 2000 ftsouthampton 2024-05-10T06:09:49Z Dayside poleward moving auroral forms (PMAFs) were detected between 06:30 and 07:00 UT on December 16, 1998, by the meridian scanning photometer and the all-sky camera at Ny Ålesund, Svalbard. Simultaneous SuperDARN HF radar measurements permitted the study of the associated ionospheric velocity pattern. A good general agreement is observed between the location and movement of velocity enhancements (flow channels) and the PMAFs. Clear signatures of equatorward flow were detected in the vicinity of PMAFs. This flow is believed to be the signature of a return flow outside the reconnected flux tube, as predicted by the Southwood model. The simulated signatures of this model reproduce globally the measured signatures, and differences with the experimental data can be explained by the simplifications of the model. Proposed schemes of the flow modification due to the presence of several flow channels and the modification of cusp and region 1 field-aligned currents at the time of sporadic reconnection events are shown to fit well with the observations. Article in Journal/Newspaper Ny Ålesund Ny-Ålesund Svalbard University of Southampton: e-Prints Soton Svalbard Ny-Ålesund |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
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description |
Dayside poleward moving auroral forms (PMAFs) were detected between 06:30 and 07:00 UT on December 16, 1998, by the meridian scanning photometer and the all-sky camera at Ny Ålesund, Svalbard. Simultaneous SuperDARN HF radar measurements permitted the study of the associated ionospheric velocity pattern. A good general agreement is observed between the location and movement of velocity enhancements (flow channels) and the PMAFs. Clear signatures of equatorward flow were detected in the vicinity of PMAFs. This flow is believed to be the signature of a return flow outside the reconnected flux tube, as predicted by the Southwood model. The simulated signatures of this model reproduce globally the measured signatures, and differences with the experimental data can be explained by the simplifications of the model. Proposed schemes of the flow modification due to the presence of several flow channels and the modification of cusp and region 1 field-aligned currents at the time of sporadic reconnection events are shown to fit well with the observations. |
format |
Article in Journal/Newspaper |
author |
Thorolfsson, A. Cerisier, J.-C. Lockwood, M. Sandholt, P.E. Senior, C. Lester, M. |
spellingShingle |
Thorolfsson, A. Cerisier, J.-C. Lockwood, M. Sandholt, P.E. Senior, C. Lester, M. Simultaneous optical and radar signatures of poleward-moving auroral forms |
author_facet |
Thorolfsson, A. Cerisier, J.-C. Lockwood, M. Sandholt, P.E. Senior, C. Lester, M. |
author_sort |
Thorolfsson, A. |
title |
Simultaneous optical and radar signatures of poleward-moving auroral forms |
title_short |
Simultaneous optical and radar signatures of poleward-moving auroral forms |
title_full |
Simultaneous optical and radar signatures of poleward-moving auroral forms |
title_fullStr |
Simultaneous optical and radar signatures of poleward-moving auroral forms |
title_full_unstemmed |
Simultaneous optical and radar signatures of poleward-moving auroral forms |
title_sort |
simultaneous optical and radar signatures of poleward-moving auroral forms |
publishDate |
2000 |
url |
https://eprints.soton.ac.uk/9182/ http://www.copernicus.org/EGU/annales/18/1054.htm |
geographic |
Svalbard Ny-Ålesund |
geographic_facet |
Svalbard Ny-Ålesund |
genre |
Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Ny Ålesund Ny-Ålesund Svalbard |
op_relation |
Thorolfsson, A., Cerisier, J.-C., Lockwood, M., Sandholt, P.E., Senior, C. and Lester, M. (2000) Simultaneous optical and radar signatures of poleward-moving auroral forms. Annales Geophysicae, 18, 1054-1066. |
_version_ |
1801380555144560640 |