On auroral dynamics observed by HF radar: 1. Equatorward edge of the afternoon-evening diffuse luminosity belt, Ann
Abstract. Observations and modelling are presented which illustrate the ability of the Finland CUTLASS HF radar to monitor the afternoon-evening equatorward auroral boundary during weak geomagnetic activity. The subsequent substorm growth phase development was also observed in the late evening secto...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.371.9582 2023-05-15T16:04:44+02:00 On auroral dynamics observed by HF radar: 1. Equatorward edge of the afternoon-evening diffuse luminosity belt, Ann M. Uspensky P. Eglitis H. Opgenoorth G. Starkov T. Pulkkinen R. Pellinen The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.9582 http://hal.archives-ouvertes.fr/docs/00/31/68/25/PDF/angeo-18-1560-2000.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.9582 http://hal.archives-ouvertes.fr/docs/00/31/68/25/PDF/angeo-18-1560-2000.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://hal.archives-ouvertes.fr/docs/00/31/68/25/PDF/angeo-18-1560-2000.pdf text ftciteseerx 2016-01-08T01:21:09Z Abstract. Observations and modelling are presented which illustrate the ability of the Finland CUTLASS HF radar to monitor the afternoon-evening equatorward auroral boundary during weak geomagnetic activity. The subsequent substorm growth phase development was also observed in the late evening sector as a natural continuation of the preceding auroral oval dynamics. Over an 8 h period the CUTLASS Finland radar observed a narrow �in range) and persistent region of auroral F- and �later) E-layer echoes which gradually moved equatorward, consistent with the auroral oval diurnal rotation. This echo region corresponds to the subvisual equatorward edge of the di€use luminosity belt �SEEL) and the ionospheric footprint of the inner boundary of the electron plasma sheet. The capability of the Finland CUTLASS radar to monitor the E-layer SEEL-echoes is a consequence of the nearly zero E-layer rectilinear aspect angles in a region 5±10 poleward of the radar site. The F-layer echoes are probably the boundary blob echoes. The UHF EISCAT radar was in operation and observed a similar subvisual auroral arc and an F-layer electron density enhancement when it appeared in its antenna beam. Text EISCAT Unknown |
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Open Polar |
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ftciteseerx |
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English |
description |
Abstract. Observations and modelling are presented which illustrate the ability of the Finland CUTLASS HF radar to monitor the afternoon-evening equatorward auroral boundary during weak geomagnetic activity. The subsequent substorm growth phase development was also observed in the late evening sector as a natural continuation of the preceding auroral oval dynamics. Over an 8 h period the CUTLASS Finland radar observed a narrow �in range) and persistent region of auroral F- and �later) E-layer echoes which gradually moved equatorward, consistent with the auroral oval diurnal rotation. This echo region corresponds to the subvisual equatorward edge of the di€use luminosity belt �SEEL) and the ionospheric footprint of the inner boundary of the electron plasma sheet. The capability of the Finland CUTLASS radar to monitor the E-layer SEEL-echoes is a consequence of the nearly zero E-layer rectilinear aspect angles in a region 5±10 poleward of the radar site. The F-layer echoes are probably the boundary blob echoes. The UHF EISCAT radar was in operation and observed a similar subvisual auroral arc and an F-layer electron density enhancement when it appeared in its antenna beam. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
M. Uspensky P. Eglitis H. Opgenoorth G. Starkov T. Pulkkinen R. Pellinen |
spellingShingle |
M. Uspensky P. Eglitis H. Opgenoorth G. Starkov T. Pulkkinen R. Pellinen On auroral dynamics observed by HF radar: 1. Equatorward edge of the afternoon-evening diffuse luminosity belt, Ann |
author_facet |
M. Uspensky P. Eglitis H. Opgenoorth G. Starkov T. Pulkkinen R. Pellinen |
author_sort |
M. Uspensky |
title |
On auroral dynamics observed by HF radar: 1. Equatorward edge of the afternoon-evening diffuse luminosity belt, Ann |
title_short |
On auroral dynamics observed by HF radar: 1. Equatorward edge of the afternoon-evening diffuse luminosity belt, Ann |
title_full |
On auroral dynamics observed by HF radar: 1. Equatorward edge of the afternoon-evening diffuse luminosity belt, Ann |
title_fullStr |
On auroral dynamics observed by HF radar: 1. Equatorward edge of the afternoon-evening diffuse luminosity belt, Ann |
title_full_unstemmed |
On auroral dynamics observed by HF radar: 1. Equatorward edge of the afternoon-evening diffuse luminosity belt, Ann |
title_sort |
on auroral dynamics observed by hf radar: 1. equatorward edge of the afternoon-evening diffuse luminosity belt, ann |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.9582 http://hal.archives-ouvertes.fr/docs/00/31/68/25/PDF/angeo-18-1560-2000.pdf |
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EISCAT |
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EISCAT |
op_source |
http://hal.archives-ouvertes.fr/docs/00/31/68/25/PDF/angeo-18-1560-2000.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.9582 http://hal.archives-ouvertes.fr/docs/00/31/68/25/PDF/angeo-18-1560-2000.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766400354037006336 |