Neutral wind vortices in the high-latitude thermosphere.
An investigation into the neutral dynamics of the high-latitude thermosphere has been carried out using measurements obtained from the Dynamics Explorer-2 spacecraft and ground-based Fabry-Perot interferometers located in Greenland, and numerical simulations from the National Center for Atmospheric...
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ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/128602 2024-01-07T09:43:41+01:00 Neutral wind vortices in the high-latitude thermosphere. Thayer, Jeffrey Paul Killeen, Timothy L. 1990 297 p. application/pdf https://hdl.handle.net/2027.42/128602 http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9034528 English EN eng http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9034528 https://hdl.handle.net/2027.42/128602 High Latitude Neutral Thermosphere Vortices Wind Thesis 1990 ftumdeepblue 2023-12-10T17:47:40Z An investigation into the neutral dynamics of the high-latitude thermosphere has been carried out using measurements obtained from the Dynamics Explorer-2 spacecraft and ground-based Fabry-Perot interferometers located in Greenland, and numerical simulations from the National Center for Atmospheric Research - Thermosphere/Ionosphere General Circulation Model (NCAR-TIGCM). In this thesis, large-scale mean neutral wind patterns under various geophysical conditions have been determined through extensive analysis of the neutral wind observations made by the DE-2 spacecraft. The mean neutral wind observations demonstrate the existence of coherent, large-scale neutral wind vortices in the high-latitude thermosphere and show that these vortices are persistent features in the mean neutral wind circulation. The mean neutral wind vortices in the high-latitude thermosphere are shown to vary spatially depending on the orientation of the interplanetary magnetic field (IMF) and the level of geomagnetic activity. In this work, the NCAR-TIGCM has been used to provide numerical simulations of the high-latitude neutral circulation corresponding to the geophysical conditions under which the averaged neutral wind patterns from DE-2 observations were organized. The high-latitude neutral wind vortices determined from the DE-2 observations and simulated by the NCAR-TIGCM have been analyzed in detail in this thesis by determining the kinematic properties of the wind fields. This analysis has shown that the dynamics of the high-latitude neutral thermosphere is dominated by rotational motion, imparted primarily through the ion-drag force, rather than by divergent motion, imparted primarily through the pressure gradient force set up by Joule and solar heating. The numerical simulations of the NCAR-TIGCM provide information on the forces which generate the neutral wind forces in the high-latitude thermosphere. The force analysis illustrates that the ion-drag force contributes significantly to the local time rate of change of the ... Thesis Greenland University of Michigan: Deep Blue Greenland |
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Open Polar |
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University of Michigan: Deep Blue |
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ftumdeepblue |
language |
English |
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High Latitude Neutral Thermosphere Vortices Wind |
spellingShingle |
High Latitude Neutral Thermosphere Vortices Wind Thayer, Jeffrey Paul Neutral wind vortices in the high-latitude thermosphere. |
topic_facet |
High Latitude Neutral Thermosphere Vortices Wind |
description |
An investigation into the neutral dynamics of the high-latitude thermosphere has been carried out using measurements obtained from the Dynamics Explorer-2 spacecraft and ground-based Fabry-Perot interferometers located in Greenland, and numerical simulations from the National Center for Atmospheric Research - Thermosphere/Ionosphere General Circulation Model (NCAR-TIGCM). In this thesis, large-scale mean neutral wind patterns under various geophysical conditions have been determined through extensive analysis of the neutral wind observations made by the DE-2 spacecraft. The mean neutral wind observations demonstrate the existence of coherent, large-scale neutral wind vortices in the high-latitude thermosphere and show that these vortices are persistent features in the mean neutral wind circulation. The mean neutral wind vortices in the high-latitude thermosphere are shown to vary spatially depending on the orientation of the interplanetary magnetic field (IMF) and the level of geomagnetic activity. In this work, the NCAR-TIGCM has been used to provide numerical simulations of the high-latitude neutral circulation corresponding to the geophysical conditions under which the averaged neutral wind patterns from DE-2 observations were organized. The high-latitude neutral wind vortices determined from the DE-2 observations and simulated by the NCAR-TIGCM have been analyzed in detail in this thesis by determining the kinematic properties of the wind fields. This analysis has shown that the dynamics of the high-latitude neutral thermosphere is dominated by rotational motion, imparted primarily through the ion-drag force, rather than by divergent motion, imparted primarily through the pressure gradient force set up by Joule and solar heating. The numerical simulations of the NCAR-TIGCM provide information on the forces which generate the neutral wind forces in the high-latitude thermosphere. The force analysis illustrates that the ion-drag force contributes significantly to the local time rate of change of the ... |
author2 |
Killeen, Timothy L. |
format |
Thesis |
author |
Thayer, Jeffrey Paul |
author_facet |
Thayer, Jeffrey Paul |
author_sort |
Thayer, Jeffrey Paul |
title |
Neutral wind vortices in the high-latitude thermosphere. |
title_short |
Neutral wind vortices in the high-latitude thermosphere. |
title_full |
Neutral wind vortices in the high-latitude thermosphere. |
title_fullStr |
Neutral wind vortices in the high-latitude thermosphere. |
title_full_unstemmed |
Neutral wind vortices in the high-latitude thermosphere. |
title_sort |
neutral wind vortices in the high-latitude thermosphere. |
publishDate |
1990 |
url |
https://hdl.handle.net/2027.42/128602 http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9034528 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9034528 https://hdl.handle.net/2027.42/128602 |
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1787424957474537472 |