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It is shown that the phase of the OMEGA REUNION signals (10.2 and 13.6kHz, La Reunion) advances significantly in association with geomagnetic bays and ionospheric absorptions. In correspondence to these disturbances, VLF phase anomalies are also observed on the OMEGA ALDRA signal (13.6kHz, Aldra, Norway) as received at Inubo, Japan. The conjugacy of occurrence of the VLF phase anomalies in the northern and southern hemispheres indicates that ionospheric disturbances responsible for VLF phase anomalies are caused by precipitation of energetic electrons from the magnetosphere. Local time characteristics of VLF phase and absorption anomalies are obtained from data recorded during a period from September 1,1980 to January 31,1981. Precipitation of energetic electrons responsible for VLF phase anomalies takes place predominantly in the evening sector peaked around 22 MLT, whereas electron precipitation responsible for absorption anomalies takes place in the morning sector peaked around 0230 and 0730 MLT. The discrepancy in these local time characteristics is due to a difference in height of the ionosphere responsible for the VLF phase anomaly (h\u003c80km) and the ionospheric absorption (h=80-100km). It is suggested that absorption anomalies are caused by energetic electrons with energies\u003e30keV and VLF phase anomalies by more energetic electrons with energies\u003e300keV. 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Simultaneous observation of VLF phase and absorption anomalies at Syowa Station, Antarctica in association with magnetospheric substorms
https://nipr.repo.nii.ac.jp/records/1414
https://nipr.repo.nii.ac.jp/records/1414967e262b-8864-4182-8d41-4840812b0cb4
名前 / ファイル | ライセンス | アクション |
---|---|---|
KJ00000012048 (1.1 MB)
|
Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1983-03-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Simultaneous observation of VLF phase and absorption anomalies at Syowa Station, Antarctica in association with magnetospheric substorms | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Kikuchi, Takashi
× Kikuchi, Takashi× Nozaki, Kenrou× Ohtani, Akira |
|||||
著者所属(英) | ||||||
en | ||||||
Radio Research Laboratories | ||||||
著者所属(英) | ||||||
en | ||||||
Radio Research Laboratories | ||||||
著者所属(英) | ||||||
en | ||||||
Inubo Radio Wave Observatory, Radio Research Laboratories | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Ionospheric disturbances associated with magnetospheric substorms were detected with VLF (ƒ=10.2 and 13.6kHz) radio wave propagation and a riometer simultaneously at Syowa Station, Antarctica. It is shown that the phase of the OMEGA REUNION signals (10.2 and 13.6kHz, La Reunion) advances significantly in association with geomagnetic bays and ionospheric absorptions. In correspondence to these disturbances, VLF phase anomalies are also observed on the OMEGA ALDRA signal (13.6kHz, Aldra, Norway) as received at Inubo, Japan. The conjugacy of occurrence of the VLF phase anomalies in the northern and southern hemispheres indicates that ionospheric disturbances responsible for VLF phase anomalies are caused by precipitation of energetic electrons from the magnetosphere. Local time characteristics of VLF phase and absorption anomalies are obtained from data recorded during a period from September 1,1980 to January 31,1981. Precipitation of energetic electrons responsible for VLF phase anomalies takes place predominantly in the evening sector peaked around 22 MLT, whereas electron precipitation responsible for absorption anomalies takes place in the morning sector peaked around 0230 and 0730 MLT. The discrepancy in these local time characteristics is due to a difference in height of the ionosphere responsible for the VLF phase anomaly (h<80km) and the ionospheric absorption (h=80-100km). It is suggested that absorption anomalies are caused by energetic electrons with energies>30keV and VLF phase anomalies by more energetic electrons with energies>300keV. This conclusion is confirmed qualitatively by observational facts that a significant phase anomaly is observed on the REUNION (10.2kHz) signal which is reflected from the lowermost part of the ionosphere, whereas no corresponding disturbances either on the REUNION (13.6kHz) signal and in ionospheric absorption. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 26, p. 113-123, 発行日 1983-03 |