Ionospheric traveling convection vortices observed near the polar cleft - A triggered response to sudden changes in the solar wind
Analysis of 20-second resolution magnetometer data from an array of temporary stations operated around Sondre Stromfjord, Greenland, during the summer of 1986 shows the signatures of localized ionospheric traveling convection vortices. An example of an isolated event of this kind observed near 08 lo...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19880043694 2023-05-15T16:29:26+02:00 Ionospheric traveling convection vortices observed near the polar cleft - A triggered response to sudden changes in the solar wind Friis-Christensen, E. Vennerstrom, S. Mchenry, M. A. Clauer, C. R. Unclassified, Unlimited, Publicly available Mar 1, 1988 http://ntrs.nasa.gov/search.jsp?R=19880043694 unknown http://ntrs.nasa.gov/search.jsp?R=19880043694 Accession ID: 88A30921 Copyright Other Sources 46 Geophysical Research Letters; 15; 253-256 1988 ftnasantrs 2012-02-15T17:35:00Z Analysis of 20-second resolution magnetometer data from an array of temporary stations operated around Sondre Stromfjord, Greenland, during the summer of 1986 shows the signatures of localized ionospheric traveling convection vortices. An example of an isolated event of this kind observed near 08 local time is presented in detail. This event consists of a twin vortex pattern of convection consistent with the presence of two field-aligned current filaments separated by about 600 km in the east-west direction. This system of currents is observed to move westward (tailward) past the array of stations at about 4 km/sec. The event is associated with relative quiet time ionospheric convection and occurs during an interval of northward IMF. It is, however, associated with a large fluctuation in both the Z and Y components of the IMF and with a large sudden decrease in the solar wind number density. The propagation of the system is inconsistent with existing models of FTE current systems, but nevertheless appears to be related to a readjustment of the magnetopause boundary to a sudden change in the solar wind dynamic pressure and/or to a change in reconnection brought about by a sudden reorientation of the IMF. Other/Unknown Material Greenland Sondre Stromfjord NASA Technical Reports Server (NTRS) Greenland |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
language |
unknown |
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46 |
spellingShingle |
46 Friis-Christensen, E. Vennerstrom, S. Mchenry, M. A. Clauer, C. R. Ionospheric traveling convection vortices observed near the polar cleft - A triggered response to sudden changes in the solar wind |
topic_facet |
46 |
description |
Analysis of 20-second resolution magnetometer data from an array of temporary stations operated around Sondre Stromfjord, Greenland, during the summer of 1986 shows the signatures of localized ionospheric traveling convection vortices. An example of an isolated event of this kind observed near 08 local time is presented in detail. This event consists of a twin vortex pattern of convection consistent with the presence of two field-aligned current filaments separated by about 600 km in the east-west direction. This system of currents is observed to move westward (tailward) past the array of stations at about 4 km/sec. The event is associated with relative quiet time ionospheric convection and occurs during an interval of northward IMF. It is, however, associated with a large fluctuation in both the Z and Y components of the IMF and with a large sudden decrease in the solar wind number density. The propagation of the system is inconsistent with existing models of FTE current systems, but nevertheless appears to be related to a readjustment of the magnetopause boundary to a sudden change in the solar wind dynamic pressure and/or to a change in reconnection brought about by a sudden reorientation of the IMF. |
format |
Other/Unknown Material |
author |
Friis-Christensen, E. Vennerstrom, S. Mchenry, M. A. Clauer, C. R. |
author_facet |
Friis-Christensen, E. Vennerstrom, S. Mchenry, M. A. Clauer, C. R. |
author_sort |
Friis-Christensen, E. |
title |
Ionospheric traveling convection vortices observed near the polar cleft - A triggered response to sudden changes in the solar wind |
title_short |
Ionospheric traveling convection vortices observed near the polar cleft - A triggered response to sudden changes in the solar wind |
title_full |
Ionospheric traveling convection vortices observed near the polar cleft - A triggered response to sudden changes in the solar wind |
title_fullStr |
Ionospheric traveling convection vortices observed near the polar cleft - A triggered response to sudden changes in the solar wind |
title_full_unstemmed |
Ionospheric traveling convection vortices observed near the polar cleft - A triggered response to sudden changes in the solar wind |
title_sort |
ionospheric traveling convection vortices observed near the polar cleft - a triggered response to sudden changes in the solar wind |
publishDate |
1988 |
url |
http://ntrs.nasa.gov/search.jsp?R=19880043694 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Sondre Stromfjord |
genre_facet |
Greenland Sondre Stromfjord |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19880043694 Accession ID: 88A30921 |
op_rights |
Copyright |
_version_ |
1766019137632468992 |