Simultaneous optical and radar signatures of poleward-moving auroral forms
International audience 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 i...
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ftinsu:oai:HAL:hal-00329159v1 2023-11-12T04:23:33+01:00 Simultaneous optical and radar signatures of poleward-moving auroral forms Thorolfsson, A. Cerisier, Jean-Claude Lockwood, M. Sandholt, P. E. Senior, Catherine Lester, M. Centre d'étude des environnements terrestre et planétaires (CETP) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Pierre et Marie Curie - Paris 6 (UPMC) Space Science and Technology Department Didcot (RAL Space) STFC Rutherford Appleton Laboratory (RAL) Science and Technology Facilities Council (STFC)-Science and Technology Facilities Council (STFC) School of Physics and Astronomy Southampton University of Southampton Department of Physics Oslo Faculty of Mathematics and Natural Sciences Oslo University of Oslo (UiO)-University of Oslo (UiO) Department of Physics and Astronomy Leicester University of Leicester 2000 https://hal.science/hal-00329159 https://hal.science/hal-00329159/document https://hal.science/hal-00329159/file/angeo-18-1054-2000.pdf en eng HAL CCSD European Geosciences Union hal-00329159 https://hal.science/hal-00329159 https://hal.science/hal-00329159/document https://hal.science/hal-00329159/file/angeo-18-1054-2000.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00329159 Annales Geophysicae, 2000, 18 (9), pp.1054-1066 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2000 ftinsu 2023-10-25T16:24:33Z International audience 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 Institut national des sciences de l'Univers: HAL-INSU Ny-Ålesund Svalbard |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Thorolfsson, A. Cerisier, Jean-Claude Lockwood, M. Sandholt, P. E. Senior, Catherine Lester, M. Simultaneous optical and radar signatures of poleward-moving auroral forms |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
Centre d'étude des environnements terrestre et planétaires (CETP) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Pierre et Marie Curie - Paris 6 (UPMC) Space Science and Technology Department Didcot (RAL Space) STFC Rutherford Appleton Laboratory (RAL) Science and Technology Facilities Council (STFC)-Science and Technology Facilities Council (STFC) School of Physics and Astronomy Southampton University of Southampton Department of Physics Oslo Faculty of Mathematics and Natural Sciences Oslo University of Oslo (UiO)-University of Oslo (UiO) Department of Physics and Astronomy Leicester University of Leicester |
format |
Article in Journal/Newspaper |
author |
Thorolfsson, A. Cerisier, Jean-Claude Lockwood, M. Sandholt, P. E. Senior, Catherine Lester, M. |
author_facet |
Thorolfsson, A. Cerisier, Jean-Claude Lockwood, M. Sandholt, P. E. Senior, Catherine 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 |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-00329159 https://hal.science/hal-00329159/document https://hal.science/hal-00329159/file/angeo-18-1054-2000.pdf |
geographic |
Ny-Ålesund Svalbard |
geographic_facet |
Ny-Ålesund Svalbard |
genre |
Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Ny Ålesund Ny-Ålesund Svalbard |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00329159 Annales Geophysicae, 2000, 18 (9), pp.1054-1066 |
op_relation |
hal-00329159 https://hal.science/hal-00329159 https://hal.science/hal-00329159/document https://hal.science/hal-00329159/file/angeo-18-1054-2000.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782338281513418752 |