Strong sunward propagating flow bursts in the night sector during quiet solar wind conditions: SuperDARN and satellite observations
High-time resolution data from the two Iceland SuperDARN HF radars show very strong nightside convection activity during a prolonged period of low geomagnetic activity and northward interplanetary magnetic field (IMF). Flows bursts with velocities ranging from 0.8 to 1.7 km/s are observed to propaga...
Published in: | Annales Geophysicae |
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2002
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00035963 2023-05-15T16:48:13+02:00 Strong sunward propagating flow bursts in the night sector during quiet solar wind conditions: SuperDARN and satellite observations Senior, C. Cerisier, J.-C. Rich, F. Lester, M. Parks, G. K. 2002-06 electronic https://doi.org/10.5194/angeo-20-771-2002 https://noa.gwlb.de/receive/cop_mods_00035963 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035917/angeo-20-771-2002.pdf https://angeo.copernicus.org/articles/20/771/2002/angeo-20-771-2002.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-20-771-2002 https://noa.gwlb.de/receive/cop_mods_00035963 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035917/angeo-20-771-2002.pdf https://angeo.copernicus.org/articles/20/771/2002/angeo-20-771-2002.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2002 ftnonlinearchiv https://doi.org/10.5194/angeo-20-771-2002 2022-02-08T22:44:15Z High-time resolution data from the two Iceland SuperDARN HF radars show very strong nightside convection activity during a prolonged period of low geomagnetic activity and northward interplanetary magnetic field (IMF). Flows bursts with velocities ranging from 0.8 to 1.7 km/s are observed to propagate in the sunward direction with phase velocities up to 1.5 km/s. These bursts occur over several hours of MLT in the 20:00–01:00 MLT sector, in the evening-side sunward convection. Data from a simultaneous DMSP pass and POLAR UVI images show a very contracted polar cap and extended regions of auroral particle precipitation from the magnetospheric boundaries. A DMSP pass over the Iceland-West field-of-view while one of these sporadic bursts of enhanced flow is observed, indicates that the flow bursts appear within the plasma sheet and at its outward edge, which excludes Kelvin-Helmholtz instabilities at the magnetopause boundary as the generation mechanism. In the nightside region, the precipitation is more spot-like and the convection organizes itself as clockwise U-shaped structures. We interpret these flow bursts as the convective transport following plasma injection events from the tail into the night-side ionosphere. We show that during this period, where the IMF clock angle is around 70°, the dayside magnetosphere is not completely closed. Key words. Ionosphere (Auroral ionosphere; Ionospheremagnetosphere interactions; Particle precipitation) Article in Journal/Newspaper Iceland Niedersächsisches Online-Archiv NOA Annales Geophysicae 20 6 771 779 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Senior, C. Cerisier, J.-C. Rich, F. Lester, M. Parks, G. K. Strong sunward propagating flow bursts in the night sector during quiet solar wind conditions: SuperDARN and satellite observations |
topic_facet |
article Verlagsveröffentlichung |
description |
High-time resolution data from the two Iceland SuperDARN HF radars show very strong nightside convection activity during a prolonged period of low geomagnetic activity and northward interplanetary magnetic field (IMF). Flows bursts with velocities ranging from 0.8 to 1.7 km/s are observed to propagate in the sunward direction with phase velocities up to 1.5 km/s. These bursts occur over several hours of MLT in the 20:00–01:00 MLT sector, in the evening-side sunward convection. Data from a simultaneous DMSP pass and POLAR UVI images show a very contracted polar cap and extended regions of auroral particle precipitation from the magnetospheric boundaries. A DMSP pass over the Iceland-West field-of-view while one of these sporadic bursts of enhanced flow is observed, indicates that the flow bursts appear within the plasma sheet and at its outward edge, which excludes Kelvin-Helmholtz instabilities at the magnetopause boundary as the generation mechanism. In the nightside region, the precipitation is more spot-like and the convection organizes itself as clockwise U-shaped structures. We interpret these flow bursts as the convective transport following plasma injection events from the tail into the night-side ionosphere. We show that during this period, where the IMF clock angle is around 70°, the dayside magnetosphere is not completely closed. Key words. Ionosphere (Auroral ionosphere; Ionospheremagnetosphere interactions; Particle precipitation) |
format |
Article in Journal/Newspaper |
author |
Senior, C. Cerisier, J.-C. Rich, F. Lester, M. Parks, G. K. |
author_facet |
Senior, C. Cerisier, J.-C. Rich, F. Lester, M. Parks, G. K. |
author_sort |
Senior, C. |
title |
Strong sunward propagating flow bursts in the night sector during quiet solar wind conditions: SuperDARN and satellite observations |
title_short |
Strong sunward propagating flow bursts in the night sector during quiet solar wind conditions: SuperDARN and satellite observations |
title_full |
Strong sunward propagating flow bursts in the night sector during quiet solar wind conditions: SuperDARN and satellite observations |
title_fullStr |
Strong sunward propagating flow bursts in the night sector during quiet solar wind conditions: SuperDARN and satellite observations |
title_full_unstemmed |
Strong sunward propagating flow bursts in the night sector during quiet solar wind conditions: SuperDARN and satellite observations |
title_sort |
strong sunward propagating flow bursts in the night sector during quiet solar wind conditions: superdarn and satellite observations |
publisher |
Copernicus Publications |
publishDate |
2002 |
url |
https://doi.org/10.5194/angeo-20-771-2002 https://noa.gwlb.de/receive/cop_mods_00035963 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035917/angeo-20-771-2002.pdf https://angeo.copernicus.org/articles/20/771/2002/angeo-20-771-2002.pdf |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-20-771-2002 https://noa.gwlb.de/receive/cop_mods_00035963 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035917/angeo-20-771-2002.pdf https://angeo.copernicus.org/articles/20/771/2002/angeo-20-771-2002.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-20-771-2002 |
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Annales Geophysicae |
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20 |
container_issue |
6 |
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771 |
op_container_end_page |
779 |
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