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Comparison of flow angle variations of E-region echo characteristics at VHF and HF
https://doi.org/10.15094/00006348
https://doi.org/10.15094/00006348c64cfb47-d5fa-4176-bc41-1d819d10f736
名前 / ファイル | ライセンス | アクション |
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KJ00000047987 (3.1 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2002-09-01 | |||||
タイトル | ||||||
タイトル | Comparison of flow angle variations of E-region echo characteristics at VHF and HF | |||||
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 | |||||
ID登録 | ||||||
ID登録 | 10.15094/00006348 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Makarevitch, R.A.
× Makarevitch, R.A.× Koustov, A.V.× Igarashi, K.× Ohtaka, K.× Ogawa, T.× Nishitani, N.× Sato, N.× Yamagishi, H.× Yukimatu, A. S. |
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著者所属(英) | ||||||
en | ||||||
Institute of Space and Atmospheric Studies,University of Saskatchewan/Institute of Space and Atmospheric Studies,University of Saskatchewan/Communications Research Laboratory/Communications Research Laboratory/Solar-Terrestrial Environment Laboratory, Nagoya University/Solar-Terrestrial Environment Laboratory, Nagoya University/National Institute of Polar Research/National Institute of Polar Research/National Institute of Polar Research | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | In this study, characteristics of the auroral E-region echoes at two significantly different radar frequencies of 12 and 50 MHz are compared. Considered observations were performed at the Syowa Antarctic station in March of 1997 using two HF and one VHF radars at various angles with respect to the magnetic L shells. The diurnal variation of echo occurrence was found to be similar at two frequencies and consistent with previous studies. On the other hand, variation of echo occurrence with L-shell angle φ was shown to be significantly different at two frequencies. 50-MHz echoes were detected preferentially along the L shell (dominating direction of the electrojet flow) while 12-MHz echoes were detected in a broad range of azimuths with the maximum in echo occurrence at φ=40-50°. By plotting the Doppler velocity versus L-shell angle, we demonstrate that 12-MHz echoes can be divided into two populations, the high- and low-velocity echoes. The high-velocity echoes were observed mostly along the L shells while the low-velocity echoes were observed at all directions. We also show that the echo populations exhibit different variation of the Doppler velocity with the L-shell angle. We argue that while the 50-MHz echoes are related to the Farley-Buneman and gradient drift plasma instabilities, the 12-MHz echoes can have additional sources, such as the thermo-diffusion instability and/or neutral wind-related plasma instabilities. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11397422 | |||||
書誌情報 |
Advances in polar upper atmosphere research 巻 16, p. 59-83, 発行日 2002-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |