Broad-spatial characteristics and energy spectrum characteristics of auroral X-rays observed by a Polar Patrol Balloon
Polar Patrol Balloon (PPB) No.6 experiment was performed over Antarctica, in order to observe wide-area characteristics of bremsstrahlung X-rays radiated from energetic precipitated electrons. PPB No.6 was launched from Syowa Station on 5 January 1993 and flew along one and a half circumpolar paths....
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ftdoajarticles:oai:doaj.org/article:bcaf17402bc84d519a572babb9920907 2023-05-15T13:36:34+02:00 Broad-spatial characteristics and energy spectrum characteristics of auroral X-rays observed by a Polar Patrol Balloon Hiromu Suzuki 1996-07-01T00:00:00Z https://doi.org/10.15094/00008929 https://doaj.org/article/bcaf17402bc84d519a572babb9920907 EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00008929 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008929 0085-7289 2432-079X https://doaj.org/article/bcaf17402bc84d519a572babb9920907 Antarctic Record, Vol 40, Iss 2, Pp 125-155 (1996) Geography (General) G1-922 article 1996 ftdoajarticles https://doi.org/10.15094/00008929 2022-12-31T08:48:12Z Polar Patrol Balloon (PPB) No.6 experiment was performed over Antarctica, in order to observe wide-area characteristics of bremsstrahlung X-rays radiated from energetic precipitated electrons. PPB No.6 was launched from Syowa Station on 5 January 1993 and flew along one and a half circumpolar paths. Distinct enhancements of auroral X-rays were often observed during the entire flight period of 27 days. This is the first observation of broad-spatial distribution of auroral X-rays by a unique instrument onboard a long life balloon. X-ray enhancements were dominant in the magnetic local dayside, and some small enhancements were observed at low latitude below 60°. Such low latitude enhancements have simple temporal structures similar to plasmaspheric hiss. The harder spectrum events tend to occur in the lower invariant latitudes, except for a few events. Latitudinal dependence of auroral X-ray spectrum agrees with latitudinal dependence of characteristic energy for cyclotron resonance. Diurnal energy variation of the X-ray spectrum was observed. This variation can be explained by theoretical precipitation lifetime on cyclotron resonance. All of the observed facts suggest that energetic electron precipitation is caused by cyclotron resonance. Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles Syowa Station |
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Directory of Open Access Journals: DOAJ Articles |
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English Japanese |
topic |
Geography (General) G1-922 |
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Geography (General) G1-922 Hiromu Suzuki Broad-spatial characteristics and energy spectrum characteristics of auroral X-rays observed by a Polar Patrol Balloon |
topic_facet |
Geography (General) G1-922 |
description |
Polar Patrol Balloon (PPB) No.6 experiment was performed over Antarctica, in order to observe wide-area characteristics of bremsstrahlung X-rays radiated from energetic precipitated electrons. PPB No.6 was launched from Syowa Station on 5 January 1993 and flew along one and a half circumpolar paths. Distinct enhancements of auroral X-rays were often observed during the entire flight period of 27 days. This is the first observation of broad-spatial distribution of auroral X-rays by a unique instrument onboard a long life balloon. X-ray enhancements were dominant in the magnetic local dayside, and some small enhancements were observed at low latitude below 60°. Such low latitude enhancements have simple temporal structures similar to plasmaspheric hiss. The harder spectrum events tend to occur in the lower invariant latitudes, except for a few events. Latitudinal dependence of auroral X-ray spectrum agrees with latitudinal dependence of characteristic energy for cyclotron resonance. Diurnal energy variation of the X-ray spectrum was observed. This variation can be explained by theoretical precipitation lifetime on cyclotron resonance. All of the observed facts suggest that energetic electron precipitation is caused by cyclotron resonance. |
format |
Article in Journal/Newspaper |
author |
Hiromu Suzuki |
author_facet |
Hiromu Suzuki |
author_sort |
Hiromu Suzuki |
title |
Broad-spatial characteristics and energy spectrum characteristics of auroral X-rays observed by a Polar Patrol Balloon |
title_short |
Broad-spatial characteristics and energy spectrum characteristics of auroral X-rays observed by a Polar Patrol Balloon |
title_full |
Broad-spatial characteristics and energy spectrum characteristics of auroral X-rays observed by a Polar Patrol Balloon |
title_fullStr |
Broad-spatial characteristics and energy spectrum characteristics of auroral X-rays observed by a Polar Patrol Balloon |
title_full_unstemmed |
Broad-spatial characteristics and energy spectrum characteristics of auroral X-rays observed by a Polar Patrol Balloon |
title_sort |
broad-spatial characteristics and energy spectrum characteristics of auroral x-rays observed by a polar patrol balloon |
publisher |
National Institute of Polar Research |
publishDate |
1996 |
url |
https://doi.org/10.15094/00008929 https://doaj.org/article/bcaf17402bc84d519a572babb9920907 |
geographic |
Syowa Station |
geographic_facet |
Syowa Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Antarctic Record, Vol 40, Iss 2, Pp 125-155 (1996) |
op_relation |
http://doi.org/10.15094/00008929 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008929 0085-7289 2432-079X https://doaj.org/article/bcaf17402bc84d519a572babb9920907 |
op_doi |
https://doi.org/10.15094/00008929 |
_version_ |
1766080764133244928 |