Observations of ionospheric convection vortices - Signatures of momentum transfer
Several classes of traveling vortices in the dayside ionospheric flow have been detected and tracked using the Greenland magnetometer chain. One class observed during quiet times consists of a continuous series of vortices moving generally antisunward for several hours at a time. Assuming each vorte...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19890046166 2023-05-15T16:29:10+02:00 Observations of ionospheric convection vortices - Signatures of momentum transfer Mchenry, M. A. Clauer, C. R. Friis-Christensen, E. Kelly, J. D. Unclassified, Unlimited, Publicly available JAN 1, 1988 http://ntrs.nasa.gov/search.jsp?R=19890046166 unknown http://ntrs.nasa.gov/search.jsp?R=19890046166 Accession ID: 89A33537 Copyright Other Sources 46 Advances in Space Research; 8; 9-10,; 315-320 1988 ftnasantrs 2012-02-15T18:01:57Z Several classes of traveling vortices in the dayside ionospheric flow have been detected and tracked using the Greenland magnetometer chain. One class observed during quiet times consists of a continuous series of vortices moving generally antisunward for several hours at a time. Assuming each vortex to be the convection pattern produced by a small field aligned current moving across the ionosphere, the amount of field aligned current was found by fitting a modeled ground magnetic signature to measurements from the chain of magnetometers. The calculated field aligned current is seen to be steady for each vortex and neighboring vortices have currents of opposite sign. Low altitude DMSP observations indicate the vortices are on field lines which map to the inner edge of the low latitude boundary layer. Because the vortices are conjugate to the boundary layer, repeat in a regular fashion and travel antisunward, it is argued that this class of vortices is caused by surface waves at the magnetopause. No strong correlations between field aligned current strength and solar wind density, velocity, or Bz is found. Other/Unknown Material Greenland NASA Technical Reports Server (NTRS) Greenland |
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46 Mchenry, M. A. Clauer, C. R. Friis-Christensen, E. Kelly, J. D. Observations of ionospheric convection vortices - Signatures of momentum transfer |
topic_facet |
46 |
description |
Several classes of traveling vortices in the dayside ionospheric flow have been detected and tracked using the Greenland magnetometer chain. One class observed during quiet times consists of a continuous series of vortices moving generally antisunward for several hours at a time. Assuming each vortex to be the convection pattern produced by a small field aligned current moving across the ionosphere, the amount of field aligned current was found by fitting a modeled ground magnetic signature to measurements from the chain of magnetometers. The calculated field aligned current is seen to be steady for each vortex and neighboring vortices have currents of opposite sign. Low altitude DMSP observations indicate the vortices are on field lines which map to the inner edge of the low latitude boundary layer. Because the vortices are conjugate to the boundary layer, repeat in a regular fashion and travel antisunward, it is argued that this class of vortices is caused by surface waves at the magnetopause. No strong correlations between field aligned current strength and solar wind density, velocity, or Bz is found. |
format |
Other/Unknown Material |
author |
Mchenry, M. A. Clauer, C. R. Friis-Christensen, E. Kelly, J. D. |
author_facet |
Mchenry, M. A. Clauer, C. R. Friis-Christensen, E. Kelly, J. D. |
author_sort |
Mchenry, M. A. |
title |
Observations of ionospheric convection vortices - Signatures of momentum transfer |
title_short |
Observations of ionospheric convection vortices - Signatures of momentum transfer |
title_full |
Observations of ionospheric convection vortices - Signatures of momentum transfer |
title_fullStr |
Observations of ionospheric convection vortices - Signatures of momentum transfer |
title_full_unstemmed |
Observations of ionospheric convection vortices - Signatures of momentum transfer |
title_sort |
observations of ionospheric convection vortices - signatures of momentum transfer |
publishDate |
1988 |
url |
http://ntrs.nasa.gov/search.jsp?R=19890046166 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19890046166 Accession ID: 89A33537 |
op_rights |
Copyright |
_version_ |
1766018867128172544 |