Temporal and spatial effects of subauroral polarization streams on the thermospheric dynamics
Temporal and spatial effects of subauroral polarization streams on the thermospheric dynamics
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亚极光偏振流对热层动力学的时空影响
DOI：
10.1029/2012ja018067
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发表时间：
2012-11
影响因子：
--
通讯作者：
Kervalishvili, Guram
中科院分区：
文献类型：
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作者：
Wang, Hui;Luehr, Hermann;Ritter, Patricia;Kervalishvili, Guram
利用DMSP卫星探测到的近两年黄昏-午夜扇区的次极光偏振流（SAPS）事件，研究了SAPS对热层物理量的时空影响。这些事件被分为两个不同的MLT（磁本地时间）组，分别为F13和F14/15。在SAPS探测位置的经度-30 °和+60°之间（MLT-2小时和+4小时）以及SAPS探测时间之前1.5小时和之后3小时的时间窗内同时进行的CHAMP观测用于比较。首次显示了SAPS的空间和时间效应。SAPS对F13 MLT扇区附近所有MLT仓（17-21 MLT）的纬向风都有较大影响，其中19 MLT附近影响最大，即SAPS爆发后0-2小时左右。从F14/15 SAPS推断，SAPS在23-24 MLT附近的影响相对较小。在大多数情况下，纬向风在第一个轨道上达到峰值，与SAPS的开始同时发生。但在19 MLT附近，纬向风在SAPS探测后1.5 h左右达到峰值。据称，这与该MLT扇区中SAPS事件的持续时间比其他扇区更长有关。SAPS使背景空气密度增加，最显著的变化发生在19 MLT附近。在SAPS纬度附近出现密度隆起。在SAPS爆发后的第一个轨道上，电子密度谷逐渐加深，并达到最小值。最大的消耗也可以在19 MLT左右发现。在SAPS爆发后，东向和向西霍尔电流（电射流）都得到加强。东风急流赤道方向的纬向风峰值为2° ~ 3 °。
Based on two years of Subauroral Polarization Streams (SAPS) events detected by DMSP satellites in the dusk‐premidnight sector, we have studied the temporal and spatial effects of SAPS on thermospheric quantities. The events are divided into two different MLT (magnetic local time) groups covered by F13 and F14/15. Concurrent CHAMP observations taken between −30° and +60° in longitude (−2 h and +4 h MLT) with respect to the SAPS detection location and within a time window of 1.5 h before and 3 h after the SAPS detection time are used for comparison. For the first time the spatial and temporal effects of SAPS are shown. SAPS have great influences on the zonal wind in all MLT bins (17–21 MLT) around the F13 MLT sector, with the largest effect appearing around 19 MLT, about 0–2 hours MLT after SAPS onset. SAPS have relatively little effect around 23–24 MLT, as deduced from F14/15 SAPS. For most cases the zonal wind peaks in the first orbit, concurrent with the SAPS onset. But around 19 MLT the zonal wind attains peak velocities about 1.5 h after the SAPS detection. This is claimed to be related to the longer persistence of SAPS events in this MLT sector than in other sectors. The background air density gets enhanced by SAPS with the most prominent variation occurring around 19 MLT. There are density bulges appearing around the SAPS latitude. The electron density trough gets deepened and attains the minimum in the first orbit after the SAPS onset. The largest depletion can also be found around 19 MLT. Both the eastward and westward Hall currents (electrojets) get strengthened right after SAPS onset. The zonal wind peaks 2°–3° in latitudes equatorward of the eastward electrojet.
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影响因子：
1.6
作者：
L. McNamara;D. Cooke;C. Valladares;B. Reinisch
通讯作者：
L. McNamara;D. Cooke;C. Valladares;B. Reinisch
亚极光偏振流、西向离子通量和纬向风之间的关系：季节和半球变化
影响因子：
--
作者：
Wang, Hui;Luehr, Hermann;Ma, Shu Y.
通讯作者：
Ma, Shu Y.
影响因子：
2.4
作者：
R. Moffett;R. Heelis;R. Sellek;G. J. Bailey
通讯作者：
R. Moffett;R. Heelis;R. Sellek;G. J. Bailey
影响因子：
--
作者：
Hui Wang;H. Lühr;K. Häusler;P. Ritter
通讯作者：
Hui Wang;H. Lühr;K. Häusler;P. Ritter
影响因子：
5.2
作者：
C. Reddy;H. G. Mayr
通讯作者：
C. Reddy;H. G. Mayr