Large density depletions in the nighttime upper ionosphere during the magnetic storm of July 15, 2000
Large density depletions in the nighttime upper ionosphere during the magnetic storm of July 15, 2000
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2000 年 7 月 15 日磁暴期间夜间上层电离层出现大密度损耗
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
J. Dongun Kim
中科院分区：
文献类型：
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作者：
J. Lee;K. Min;V. P. Kim;V. Hegai;K. Oyama;F. Rich;J. Dongun Kim
在2000年7月15日的磁暴过程中，我们用韩国多用途卫星1号（KOMPSAT-1）上的朗缪尔探测器测量了夜间上电离层的电子密度和温度。在风暴的主要阶段，KOMPSAT-1在0°E附近探测到一个非常深和广泛的电子密度槽，中心位于地磁赤道周围。电子密度从0.44 × 105 cm −3急剧下降到小于2 × 104 cm −3，而槽区沿卫星轨道延伸超过沿着1400 km。在恢复阶段后期，KOMPSAT-1观测到在东经230°附近仍然存在严重的畸变，南半球的密度增强。连同DMSP观测，我们估计所观察到的槽的大小至少为5500公里的纵向方向。DMSP的数据显示，该槽是由增强的向东电场引起的，该电场将赤道F区电离层向上抬升。
We measured electron density and temperature of the nighttime upper ionosphere for the several key intervals during the progress of the magnetic storm on 15 July 2000 with the Langmuir probe on Korea Multipurpose Satellite‐1 (KOMPSAT‐1). During the main phase of the storm KOMPSAT‐1 detected near 0°E a very deep and extensive trough of electron density centered around the geomagnetic equator. The electron density dropped sharply from ∼4 × 105cm−3 to less than 2 × 104cm−3, with the trough region extended over 1400 km along the satellite track. Later in the recovery phase, KOMPSAT‐1 observed severe distortion still persisted near 230°E, with enhanced density in the southern hemisphere. Together with DMSP observations, we estimate the size of the observed trough to be at least 5500 km in the longitudinal direction. DMSP data indicates that the trough was caused by the enhanced eastward electric field which lifted the equatorial F‐region ionosphere upward.