Auroral O+ 732/733 nm emission and its relation to ion upflow
スポンサーリンク
概要
- 論文の詳細を見る
Observations of auroral oxygen ion emission at 732/733 nm were made at the Aurora station in Longyearbyen (78.2.N, 16.3.E; lm=74.9.) using an all-sky spectrograph (ASG) during the winter season of 2000/2001. A statistical analysis showed that the highest occurrence of oxygen ion auroras at Longyearbyen was seen in the dayside of the 09-12MLT region; the intensities of these auroras were also larger than those on the night side. To study the mechanism of ion up゜ow in the polar ionosphere, ASG data obtained on December 7, 2000, was analyzed together with simultaneous ionospheric data obtained by EISCAT Svalbard radar (ESR). Enhancements of electron temperature and ion upward velocity were associated with an increase in the auroral OII intensity at the magnetic zenith. This result suggests that an ambipolar electric field associated with electron temperature enhancement caused by soft electron precipitation may be involved in the mechanisms that drive ionospheric ions upward.
- 国立極地研究所の論文
著者
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Taguchi Makoto
National Institute of Polar Research
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SAKANOI Takeshi
Planetary Plasma and Atmospheric Research Center, Tohoku University
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Koizumi Naoko
Planetary Plasma And Atmospheric Research Center Tohoku University
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Okano Shoichi
Planetary Plasma and Atmospheric Research Center, Tohoku University
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Aso Takehiko
National Institute of Polar Research
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Takeshita Shu
Planetary Plasma And Atmospheric Research Center Tohoku University
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Sakanoi Takeshi
Planetary Plasma And Atmospheric Research Center Tohoku University
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Okano Shoichi
Planetary Plasma And Atmospheric Research Center Tohoku University
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Taguchi M
National Institute Of Polar Research
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Sakanoi Takeshi
Planetary Plasma And Atmospheric Research Center Graduate School Of Science Tohoku University
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Okano Shoichi
Planetary Plasma And Atmospheric Research Center Graduate School Of Science Tohoku University
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Sakanoi Takeshi
Planetary Plasma And Atmospheric Research Center Department Of Geophysics Tohoku University
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