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There existed two important irregular regions caused by electrostatic plasma instabilities. At altitudes of 100-140km both cross-field (gradient-drift) and two-stream instabilities were found, the excitation of which depends on the strength of DC electric field; the two-stream instability giving rise to high-frequency fluctuations becomes important when E\u0026gsim;25mV/m, while the cross-field instability exciting longer wavelengths is dominant when E\u0026lsim;25mV/m. Electrostatic ion cyclotron waves (frequency\u0026sime;38-45Hz, frequency bandwidth\u0026sime;10Hz) propagating nearly parallel to the auroral form were observed around a 200km altitude in association with strong field-aligned currents. Additionally, artificially modulated fluctuations due to the plasma wake produced by rocket body and other probes were detected. 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Electrostatic Plasma Instabilities in Highly Active Aurora Observed by a Sounding Rocket S-310JA-7
https://nipr.repo.nii.ac.jp/records/1142
https://nipr.repo.nii.ac.jp/records/1142e77a1c63-aaa8-4d63-bcc2-96acf4fd99a8
名前 / ファイル | ライセンス | アクション |
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KJ00000011668 (2.2 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1981-03-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Electrostatic Plasma Instabilities in Highly Active Aurora Observed by a Sounding Rocket S-310JA-7 | |||||
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) |
Ogawa, Tadahiko
× Ogawa, Tadahiko× Mori, Hirotaka× Miyazaki, Shigeru× Yamagishi, Hisao |
|||||
著者所属(英) | ||||||
en | ||||||
Hiraiso Branch, Radio Research Laboratories/Radio Research Laboratories/Radio Research Laboratories/National Institute of Polar Research | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | A sounding rocket S-310JA-7 launched from Syowa Station, Antarctica, carried into highly active auroras the Faraday cup for measuring electron density fluctuations of both 5-330Hz and 0.1-8kHz bands together with electron density and precipitating electron flux above 105eV. There existed two important irregular regions caused by electrostatic plasma instabilities. At altitudes of 100-140km both cross-field (gradient-drift) and two-stream instabilities were found, the excitation of which depends on the strength of DC electric field; the two-stream instability giving rise to high-frequency fluctuations becomes important when E≳25mV/m, while the cross-field instability exciting longer wavelengths is dominant when E≲25mV/m. Electrostatic ion cyclotron waves (frequency≃38-45Hz, frequency bandwidth≃10Hz) propagating nearly parallel to the auroral form were observed around a 200km altitude in association with strong field-aligned currents. Additionally, artificially modulated fluctuations due to the plasma wake produced by rocket body and other probes were detected. These results are discussed in the light of recent theories of electrostatic plasma instabilities in the auroral ionosphere. | |||||
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 18, p. 312-329, 発行日 1981-03 |