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首页> 外文期刊>Geomagnetism and Aeronomy >Response of dayside auroras to abrupt increases in the solar wind dynamic pressure at positive and negative polarity of the IMF Bz component
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Response of dayside auroras to abrupt increases in the solar wind dynamic pressure at positive and negative polarity of the IMF Bz component

机译：日间极光对IMF Bz组件正负极性下太阳风动态压力突然增加的响应

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摘要

The optical observations on Heiss Island ([Phi]' = 75.0 degrees) have been used to study the characteristics of auroras in the near-noon MLT sector after abrupt increases in the solar wind dynamic pressure at negative and positive polarity of the IMF Bz component. It has been found out that the 427.8 and 557.7 nm emission intensities considerably increased at Bz 0, fluxes of harder (E > 1 keV) precipitating electrons were superimposed on the soft spectrum of precipitating particles in the equatorial part of the red luminosity band. This red band part was hypothetically caused by the low-latitude boundary layer (LLBL) on closed lines of the geomagnetic field, the estimated thickness of which is 3 Re. The 557.7 nm emission intensity increased during 3-5 min after SC/SI and was accompanied by the displacement of the red band equatorward boundary toward lower latitudes. The displacement value was 150-200 km when the dynamic pressure abruptly increased by a factor of 3-5. After SC/SI, the 630.0 nm emission intensity continued increasing during 16-18 min. It is assumed that the time of an increase in the red line intensity corresponds to the time of saturation of the magnetospheric boundary layers with magnetosheath particles after an abrupt increase in their density. [PUBLICATION ABSTRACT]
机译：Heiss岛上的光学观测（Φ'= 75.0度）已用于研究在IMF Bz分量的负极和正极性下太阳风动压力突然增加后，近午MLT区域的极光特征。 。已发现在Bz 0处427.8和557.7 nm的发射强度显着增加，较硬（E> 1 keV）沉淀电子的通量叠加在红色发光度带赤道部分的沉淀粒子的软光谱上。假设该红带部分​​是由地磁场闭合线上的低纬度边界层（LLBL）引起的，其估计厚度为3 Re。 557.7 nm的发射强度在SC / SI后的3-5分钟内增加，并伴有赤道赤道边界向低纬度的位移。动压突然增加3-5倍时，位移值为150-200 km。 SC / SI后，在16-18分钟内630.0 nm的发射强度继续增加。假定红线强度增加的时间对应于其密度突然增加后磁层的磁层边界层饱和的时间。 [出版物摘要]

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