Interhemispheric plasma flows in the equatorial topside ionosphere
Interhemispheric plasma flows in the equatorial topside ionosphere
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DOI：
10.1029/2000ja000012
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发表时间：
2000-08
影响因子：
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通讯作者：
S. Venkatraman;R. Heelis
中科院分区：
文献类型：
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作者：
S. Venkatraman;R. Heelis
研究了国防气象卫星计划F10卫星在830公里附近测得的场向流和垂直流的纬向、经度和季节变化。在1991年太阳活动高的冬至期间的夜间(当地时间2100磁)对这些剖面进行了研究。纬度和经度的变化显示了F区风对观测到的场向气流的调制作用。在夜间，在冬半球观测到了400-600ms−1的大的向下磁场排列的气流，并且在经度上与之前由Venkatraman和Heelis[1999a]研究的绝热加热效应的位置一致。在太阳活动高峰期，当地时间2100时的半球间气流可以延伸到∼1000公里的顶点高度。然而，垂直漂移与预期的纬度相对不变。
Latitudinal, longitudinal, and seasonal variations in the field-aligned and perpendicular flows measured at an altitude near 830 km, by the Defense Meteorological Satellite Program F10 satellite are examined. These profiles are studied during the nighttime (2100 magnetic local time) for solstice periods in 1991 when the solar activity is high. Latitude and longitude variations show the influence of F region winds in modulating the observed field-aligned flows. At night, large downward field-aligned flows of the order 400–600 ms−1 are observed in the winter hemisphere and coincide in longitude with the location of previously identified adiabatic heating effects studied by Venkatraman and Heelis [1999a], Interhemispheric flows at 2100 hours local time are seen to extend up to apex heights of ∼ 1000 km during times of high solar activity. Perpendicular drifts, however are relatively invariant with latitude as expected.