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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ftdoajarticles:oai:doaj.org/article:9b3a0b0ff6e54794b8eb7966b1aee0fd 2023-05-15T17:48:28+02:00 Simultaneous optical and radar signatures of poleward-moving auroral forms A. Thorolfsson J.-C. Cerisier M. Lockwood P. E. Sandholt C. Senior M. Lester 2000-09-01T00:00:00Z https://doi.org/10.1007/s00585-000-1054-2 https://doaj.org/article/9b3a0b0ff6e54794b8eb7966b1aee0fd EN eng Copernicus Publications https://www.ann-geophys.net/18/1054/2000/angeo-18-1054-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-1054-2 0992-7689 1432-0576 https://doaj.org/article/9b3a0b0ff6e54794b8eb7966b1aee0fd Annales Geophysicae, Vol 18, Pp 1054-1066 (2000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2000 ftdoajarticles https://doi.org/10.1007/s00585-000-1054-2 2022-12-31T03:27:27Z 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. Key words: Ionosphere (auroral ionosphere; plasma convection) - Magnetospheric physics (magnetopause; cusp and boundary layers) Article in Journal/Newspaper Ny Ålesund Ny-Ålesund Svalbard Directory of Open Access Journals: DOAJ Articles Ny-Ålesund Svalbard Annales Geophysicae 18 9 1054 1066 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 A. Thorolfsson J.-C. Cerisier M. Lockwood P. E. Sandholt C. Senior M. Lester Simultaneous optical and radar signatures of poleward-moving auroral forms |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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. Key words: Ionosphere (auroral ionosphere; plasma convection) - Magnetospheric physics (magnetopause; cusp and boundary layers) |
format |
Article in Journal/Newspaper |
author |
A. Thorolfsson J.-C. Cerisier M. Lockwood P. E. Sandholt C. Senior M. Lester |
author_facet |
A. Thorolfsson J.-C. Cerisier M. Lockwood P. E. Sandholt C. Senior M. Lester |
author_sort |
A. Thorolfsson |
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 |
publisher |
Copernicus Publications |
publishDate |
2000 |
url |
https://doi.org/10.1007/s00585-000-1054-2 https://doaj.org/article/9b3a0b0ff6e54794b8eb7966b1aee0fd |
geographic |
Ny-Ålesund Svalbard |
geographic_facet |
Ny-Ålesund Svalbard |
genre |
Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Ny Ålesund Ny-Ålesund Svalbard |
op_source |
Annales Geophysicae, Vol 18, Pp 1054-1066 (2000) |
op_relation |
https://www.ann-geophys.net/18/1054/2000/angeo-18-1054-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-1054-2 0992-7689 1432-0576 https://doaj.org/article/9b3a0b0ff6e54794b8eb7966b1aee0fd |
op_doi |
https://doi.org/10.1007/s00585-000-1054-2 |
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Annales Geophysicae |
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18 |
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9 |
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1054 |
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1066 |
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