Estimate of auroral electron spectra, the power of ground-based multi-station optical measurements

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI:10.1016/S1464-1917(00)00106-9

B. Gustavsson, A. Steen, T. Sergienko, B.U.E. Brändström

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引用次数: 10

Abstract

Ground-based multi-station optical imaging has a great inherent scientific potential for investigations of the magnetosphere-ionosphere-thermosphere interactions by using inversions of the ionospheric optical signal, the aurora.

Two methods for estimating characteristics of primary auroral electron spectra are compared and used to describe an auroral event. One method uses the spectral information in the images and the other method is based on the inversion of the N₂⁺1NG 4287 Å altitude distribution. With the second method ALIS can currently give estimates of the primary electron distribution with medium time resolution (10 s).

The auroral event, a passage of an eastward moving fold in a pre-existing auroral arc, is analysed and characteristics of the precipitating electrons show regions with different fluxes, e.g. a soft region that has previously been found inside the fold appears to belong to a wider region of soft precipitation that emerges as the arc activates.

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估计极光电子能谱，地面多站光学测量的功率

地面多站光学成像具有巨大的内在科学潜力，可以利用电离层光信号极光的逆温来研究磁层-电离层-热层的相互作用。比较了两种估计初等极光电子能谱特征的方法，并将其用于描述一次极光事件。一种方法是利用图像中的光谱信息，另一种方法是基于N2+1NG 4287 Å海拔分布的反演。利用第二种方法，ALIS目前可以给出中等时间分辨率(10秒)的初级电子分布估计。分析了先前存在的极光弧中向东移动褶皱的极光事件，并且沉淀电子的特征显示出不同通量的区域，例如先前在褶皱内发现的软区似乎属于随着弧激活而出现的更广泛的软沉淀区域。

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