Imaging riometer and HF radar measurements of drifting F region electron density structures in the polar cap
A study of riometer, photometer, and ionosonde data from South Pole Station has revealed a class of unusual dayside absorption events which occur near local magnetic noon when South Pole is located poleward of the dayside cusp. These events, which can reach values in excess of 1 dB in narrow-beam 38...
Published in: | Journal of Geophysical Research: Space Physics |
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American Geophysical Union
1993
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Online Access: | http://nora.nerc.ac.uk/id/eprint/518051/ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/92JA02550 |
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ftnerc:oai:nora.nerc.ac.uk:518051 2023-05-15T18:21:52+02:00 Imaging riometer and HF radar measurements of drifting F region electron density structures in the polar cap Rosenberg, T.J. Wang, Z. Rodger, A.S. Dudeney, J.R. Baker, K.B. 1993-05 http://nora.nerc.ac.uk/id/eprint/518051/ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/92JA02550 unknown American Geophysical Union Rosenberg, T.J.; Wang, Z.; Rodger, A.S.; Dudeney, J.R.; Baker, K.B. 1993 Imaging riometer and HF radar measurements of drifting F region electron density structures in the polar cap. Journal of Geophysical Research, 98 (A5). 7757-7764. https://doi.org/10.1029/92JA02550 <https://doi.org/10.1029/92JA02550> Publication - Article PeerReviewed 1993 ftnerc https://doi.org/10.1029/92JA02550 2023-02-04T19:45:27Z A study of riometer, photometer, and ionosonde data from South Pole Station has revealed a class of unusual dayside absorption events which occur near local magnetic noon when South Pole is located poleward of the dayside cusp. These events, which can reach values in excess of 1 dB in narrow-beam 38.2-MHz riometer measurements, are accompanied by significant enhancement of the O(¹D2) 630.0-nm emission. However, because there is no corresponding change in the N2+ 427.8-nm emission, it is unlikely that these events are caused by the conventional D or lower E region ionization increases usually attributed to the precipitation of auroral electrons of keV energy. Rather, the comparison of South Pole imaging riometer and ionosonde data with simultaneous Halley PACE HF radar data suggests that these unusual absorption events are related to F region electron density structures drifting from the dayside oval into the polar cap. If further work sustains this interpretation, then new prospects will be opened up for using imaging riometers to examine aspects of polar cap convection. Article in Journal/Newspaper South pole Natural Environment Research Council: NERC Open Research Archive South Pole Journal of Geophysical Research: Space Physics 98 A5 7757 7764 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
description |
A study of riometer, photometer, and ionosonde data from South Pole Station has revealed a class of unusual dayside absorption events which occur near local magnetic noon when South Pole is located poleward of the dayside cusp. These events, which can reach values in excess of 1 dB in narrow-beam 38.2-MHz riometer measurements, are accompanied by significant enhancement of the O(¹D2) 630.0-nm emission. However, because there is no corresponding change in the N2+ 427.8-nm emission, it is unlikely that these events are caused by the conventional D or lower E region ionization increases usually attributed to the precipitation of auroral electrons of keV energy. Rather, the comparison of South Pole imaging riometer and ionosonde data with simultaneous Halley PACE HF radar data suggests that these unusual absorption events are related to F region electron density structures drifting from the dayside oval into the polar cap. If further work sustains this interpretation, then new prospects will be opened up for using imaging riometers to examine aspects of polar cap convection. |
format |
Article in Journal/Newspaper |
author |
Rosenberg, T.J. Wang, Z. Rodger, A.S. Dudeney, J.R. Baker, K.B. |
spellingShingle |
Rosenberg, T.J. Wang, Z. Rodger, A.S. Dudeney, J.R. Baker, K.B. Imaging riometer and HF radar measurements of drifting F region electron density structures in the polar cap |
author_facet |
Rosenberg, T.J. Wang, Z. Rodger, A.S. Dudeney, J.R. Baker, K.B. |
author_sort |
Rosenberg, T.J. |
title |
Imaging riometer and HF radar measurements of drifting F region electron density structures in the polar cap |
title_short |
Imaging riometer and HF radar measurements of drifting F region electron density structures in the polar cap |
title_full |
Imaging riometer and HF radar measurements of drifting F region electron density structures in the polar cap |
title_fullStr |
Imaging riometer and HF radar measurements of drifting F region electron density structures in the polar cap |
title_full_unstemmed |
Imaging riometer and HF radar measurements of drifting F region electron density structures in the polar cap |
title_sort |
imaging riometer and hf radar measurements of drifting f region electron density structures in the polar cap |
publisher |
American Geophysical Union |
publishDate |
1993 |
url |
http://nora.nerc.ac.uk/id/eprint/518051/ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/92JA02550 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
Rosenberg, T.J.; Wang, Z.; Rodger, A.S.; Dudeney, J.R.; Baker, K.B. 1993 Imaging riometer and HF radar measurements of drifting F region electron density structures in the polar cap. Journal of Geophysical Research, 98 (A5). 7757-7764. https://doi.org/10.1029/92JA02550 <https://doi.org/10.1029/92JA02550> |
op_doi |
https://doi.org/10.1029/92JA02550 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
98 |
container_issue |
A5 |
container_start_page |
7757 |
op_container_end_page |
7764 |
_version_ |
1766201194791829504 |