Model-Observation Comparison Study of Multiple Polar Cap Arcs
A quantitative model-observation comparison of multiple polar cap arcs has been conducted by using a time-dependent theoretical model of polar cap arcs. In particular, the electrodynamical features of multiple polar cap arcs with various spacings are simulated and the results are compared with the i...
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ftutahsudc:oai:digitalcommons.usu.edu:physics_facpub-1182 2023-05-15T18:03:52+02:00 Model-Observation Comparison Study of Multiple Polar Cap Arcs Zhu, Lie Valladares, Cesar E. Sojka, Jan Josef Schunk, Robert W. Crain, D. J. American Geophysical Union 1996-01-01T08:00:00Z application/pdf https://digitalcommons.usu.edu/physics_facpub/183 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1182&context=physics_facpub unknown Hosted by Utah State University Libraries https://digitalcommons.usu.edu/physics_facpub/183 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1182&context=physics_facpub Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. PDM All Physics Faculty Publications model-observation study polar cap arcs Physics text 1996 ftutahsudc 2022-03-07T22:26:36Z A quantitative model-observation comparison of multiple polar cap arcs has been conducted by using a time-dependent theoretical model of polar cap arcs. In particular, the electrodynamical features of multiple polar cap arcs with various spacings are simulated and the results are compared with the images obtained from the All-Sky Intensified Photometer at Qaanaaq. The results show that the observed and simulated arcs are quite similar, both spatially and temporally. The results support the theory proposed by Zhu et al. [1993a, 1994b] that the structure of polar cap arcs is mainly determined by the magnetosphere-ionosphere (M-I) coupling processes and that the spacing of multiple polar cap arcs is closely related to the hardness of the primary magnetospheric precipitation. It is found that for the multiple polar cap arcs with both narrow and wide spacings, the associated field-aligned currents are mainly closed by Pedersen currents. It is also found that a hard precipitation can lead to a highly structured secondary arc because of the nonlinear M-I coupling processes. Text Qaanaaq Utah State University: DigitalCommons@USU Pedersen ENVELOPE(140.013,140.013,-66.668,-66.668) Qaanaaq ENVELOPE(-69.232,-69.232,77.467,77.467) |
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Open Polar |
collection |
Utah State University: DigitalCommons@USU |
op_collection_id |
ftutahsudc |
language |
unknown |
topic |
model-observation study polar cap arcs Physics |
spellingShingle |
model-observation study polar cap arcs Physics Zhu, Lie Valladares, Cesar E. Sojka, Jan Josef Schunk, Robert W. Crain, D. J. Model-Observation Comparison Study of Multiple Polar Cap Arcs |
topic_facet |
model-observation study polar cap arcs Physics |
description |
A quantitative model-observation comparison of multiple polar cap arcs has been conducted by using a time-dependent theoretical model of polar cap arcs. In particular, the electrodynamical features of multiple polar cap arcs with various spacings are simulated and the results are compared with the images obtained from the All-Sky Intensified Photometer at Qaanaaq. The results show that the observed and simulated arcs are quite similar, both spatially and temporally. The results support the theory proposed by Zhu et al. [1993a, 1994b] that the structure of polar cap arcs is mainly determined by the magnetosphere-ionosphere (M-I) coupling processes and that the spacing of multiple polar cap arcs is closely related to the hardness of the primary magnetospheric precipitation. It is found that for the multiple polar cap arcs with both narrow and wide spacings, the associated field-aligned currents are mainly closed by Pedersen currents. It is also found that a hard precipitation can lead to a highly structured secondary arc because of the nonlinear M-I coupling processes. |
author2 |
American Geophysical Union |
format |
Text |
author |
Zhu, Lie Valladares, Cesar E. Sojka, Jan Josef Schunk, Robert W. Crain, D. J. |
author_facet |
Zhu, Lie Valladares, Cesar E. Sojka, Jan Josef Schunk, Robert W. Crain, D. J. |
author_sort |
Zhu, Lie |
title |
Model-Observation Comparison Study of Multiple Polar Cap Arcs |
title_short |
Model-Observation Comparison Study of Multiple Polar Cap Arcs |
title_full |
Model-Observation Comparison Study of Multiple Polar Cap Arcs |
title_fullStr |
Model-Observation Comparison Study of Multiple Polar Cap Arcs |
title_full_unstemmed |
Model-Observation Comparison Study of Multiple Polar Cap Arcs |
title_sort |
model-observation comparison study of multiple polar cap arcs |
publisher |
Hosted by Utah State University Libraries |
publishDate |
1996 |
url |
https://digitalcommons.usu.edu/physics_facpub/183 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1182&context=physics_facpub |
long_lat |
ENVELOPE(140.013,140.013,-66.668,-66.668) ENVELOPE(-69.232,-69.232,77.467,77.467) |
geographic |
Pedersen Qaanaaq |
geographic_facet |
Pedersen Qaanaaq |
genre |
Qaanaaq |
genre_facet |
Qaanaaq |
op_source |
All Physics Faculty Publications |
op_relation |
https://digitalcommons.usu.edu/physics_facpub/183 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1182&context=physics_facpub |
op_rights |
Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. |
op_rightsnorm |
PDM |
_version_ |
1766174894005944320 |