An Apparent Lifetime of Auroral 630.0nm (OI) Emissions
An Apparent Lifetime of Auroral 630.0nm (OI) Emissions
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极光 630.0nm (OI) 发射的表观寿命
DOI：
10.5636/jgg.44.91
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
T. Hirasawa
中科院分区：
文献类型：
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作者：
T. Ono;T. Hirasawa
本文利用1984年7月18日在南极雪娃站获得的单色极光电视图象，研究了极光红光（630.0nmOI）发射的视寿命。我们试图通过使用红线强度的时间变化来评估入射电子的平均能量。观测到的红线强度与合成的极光红线的变化进行了比较，解决了极光电离层中的化学反应微分方程以及激发态氧原子的失活。观测结果表明，红线强度是渐变的，其表观寿命约为35- 40秒，而绿色线强度则呈阶梯状变化。发现的寿命明显小于以前用于解释630.0nm（OI）极光发射的值（约110秒）。比较表明，观测到的表观寿命与特征能量为0.2-0.5keV的低能电子激发的合成极光一致。
An apparent lifetime of the auroral red line (630.0nm OI) emission was investigated by using monochromatic auroral TV images obtained on July 18, 1984, at Syowa Station, Antarctica. We tried to evaluate a mean energy of the incoming electrons by using the temporal variation of the red line intensity. The observed red line intensity is compared with a synthesized variation of the auroral red line solving differential equations for chemical reactions in the auroral ionosphere as well as the deactivation of excited state oxygen atoms. The observational results showed that the red line intensity changed gradually keeping an apparent lifetime of about 35-40sec while the green line intensity changed step-wise. The lifetime found is significantly smaller than a value (about 110sec) previously used for the interpretation of 630.0nm (OI) auroral emission. The comparison showed that the observed apparent lifetime is consistent with a synthesized aurora excited by a low energy electrons with a characteristic energy of 0.2-0.5keV.
S.Sato 等人：Mon.Not.Roy.Astron.Soc.230。
DOI：
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发表时间：
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