Observation of VLF Emissions at Syowa Station in 1970-1971 : I. Relationship between the Occurrence of Auroral Hiss Emissions and the Location of Auroral Arcs (Reports of the Japanese Antarctic Research Expedition)
VLF emissions were observed at Syowa Station by the 11th wintering party of the Japanese Antarctic Research Expedition in 1970-1971. The present paper deals particularly with the records of auroral hiss emissions, which are believed to be emitted by precipitating electrons in the aurora. It is shown...
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National Institute of Polar Research
1973
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ftdoajarticles:oai:doaj.org/article:c667ae7d402140f89ec39ff95d04a588 2023-05-15T14:04:44+02:00 Observation of VLF Emissions at Syowa Station in 1970-1971 : I. Relationship between the Occurrence of Auroral Hiss Emissions and the Location of Auroral Arcs (Reports of the Japanese Antarctic Research Expedition) Kazuo MAKITA Hiroshi FUKUNISHI 1973-03-01T00:00:00Z https://doi.org/10.15094/00007699 https://doaj.org/article/c667ae7d402140f89ec39ff95d04a588 EN JA eng jpn National Institute of Polar Research https://doi.org/10.15094/00007699 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007699 0085-7289 2432-079X https://doaj.org/article/c667ae7d402140f89ec39ff95d04a588 Antarctic Record, Iss 46, Pp 1-15 (1973) Geography (General) G1-922 article 1973 ftdoajarticles https://doi.org/10.15094/00007699 2022-12-31T03:20:18Z VLF emissions were observed at Syowa Station by the 11th wintering party of the Japanese Antarctic Research Expedition in 1970-1971. The present paper deals particularly with the records of auroral hiss emissions, which are believed to be emitted by precipitating electrons in the aurora. It is shown that the power spectrum of the hiss emissions is confined in the low-frequency range between 4-32kHz if the auroral arcs lie near the poleward horizon of Syowa Station, while it is extended to frequencies as high as 128kHz if the active auroral arcs appear near the zenith. This can be explained by differences in the height of the emission region and in the propagation path of the hiss in the ionosphere : the high-frequency (~64kHz) hiss is emitted at low altitudes of 1000-1500km, its propagation path being limited to a narrow region near the location of the auroral arcs, while the low-frequency (~8kHz) hiss is emitted at higher altitudes of 3000-3500km, its propagation path spreading widely due to the refraction effect in the ionosphere. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic Syowa Station |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Kazuo MAKITA Hiroshi FUKUNISHI Observation of VLF Emissions at Syowa Station in 1970-1971 : I. Relationship between the Occurrence of Auroral Hiss Emissions and the Location of Auroral Arcs (Reports of the Japanese Antarctic Research Expedition) |
topic_facet |
Geography (General) G1-922 |
description |
VLF emissions were observed at Syowa Station by the 11th wintering party of the Japanese Antarctic Research Expedition in 1970-1971. The present paper deals particularly with the records of auroral hiss emissions, which are believed to be emitted by precipitating electrons in the aurora. It is shown that the power spectrum of the hiss emissions is confined in the low-frequency range between 4-32kHz if the auroral arcs lie near the poleward horizon of Syowa Station, while it is extended to frequencies as high as 128kHz if the active auroral arcs appear near the zenith. This can be explained by differences in the height of the emission region and in the propagation path of the hiss in the ionosphere : the high-frequency (~64kHz) hiss is emitted at low altitudes of 1000-1500km, its propagation path being limited to a narrow region near the location of the auroral arcs, while the low-frequency (~8kHz) hiss is emitted at higher altitudes of 3000-3500km, its propagation path spreading widely due to the refraction effect in the ionosphere. |
format |
Article in Journal/Newspaper |
author |
Kazuo MAKITA Hiroshi FUKUNISHI |
author_facet |
Kazuo MAKITA Hiroshi FUKUNISHI |
author_sort |
Kazuo MAKITA |
title |
Observation of VLF Emissions at Syowa Station in 1970-1971 : I. Relationship between the Occurrence of Auroral Hiss Emissions and the Location of Auroral Arcs (Reports of the Japanese Antarctic Research Expedition) |
title_short |
Observation of VLF Emissions at Syowa Station in 1970-1971 : I. Relationship between the Occurrence of Auroral Hiss Emissions and the Location of Auroral Arcs (Reports of the Japanese Antarctic Research Expedition) |
title_full |
Observation of VLF Emissions at Syowa Station in 1970-1971 : I. Relationship between the Occurrence of Auroral Hiss Emissions and the Location of Auroral Arcs (Reports of the Japanese Antarctic Research Expedition) |
title_fullStr |
Observation of VLF Emissions at Syowa Station in 1970-1971 : I. Relationship between the Occurrence of Auroral Hiss Emissions and the Location of Auroral Arcs (Reports of the Japanese Antarctic Research Expedition) |
title_full_unstemmed |
Observation of VLF Emissions at Syowa Station in 1970-1971 : I. Relationship between the Occurrence of Auroral Hiss Emissions and the Location of Auroral Arcs (Reports of the Japanese Antarctic Research Expedition) |
title_sort |
observation of vlf emissions at syowa station in 1970-1971 : i. relationship between the occurrence of auroral hiss emissions and the location of auroral arcs (reports of the japanese antarctic research expedition) |
publisher |
National Institute of Polar Research |
publishDate |
1973 |
url |
https://doi.org/10.15094/00007699 https://doaj.org/article/c667ae7d402140f89ec39ff95d04a588 |
geographic |
Antarctic Syowa Station |
geographic_facet |
Antarctic Syowa Station |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Antarctic Record, Iss 46, Pp 1-15 (1973) |
op_relation |
https://doi.org/10.15094/00007699 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007699 0085-7289 2432-079X https://doaj.org/article/c667ae7d402140f89ec39ff95d04a588 |
op_doi |
https://doi.org/10.15094/00007699 |
_version_ |
1766275996412018688 |