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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Climatology of plasma density depletions observed by DMSP in the dawn sector
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Climatology of plasma density depletions observed by DMSP in the dawn sector

机译：等离子体密度的气候学消逝黎明DMSP的部门

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摘要

Prior to the launch of the Communication/Navigation Outage Forecasting System (C/NOFS) satellite, equatorial plasma bubbles (EPBs) were regarded as postsunset phenomena. However, during this recent solar minimum the planar Langmuir probe (PLP) on the C/NOFS satellite has detected very few EPBs after sunset; most plasma density depletions have been observed between local midnight and dawn. We take advantage of the long history of plasma density measurements by a similar sensor on Defense Meteorological Satellite Program (DMSP) spacecraft to determine whether this change is typical of solar minima in general or unique to the present extended quiet time. In 2008 and 2009 the DMSP occurrence rates of topside plasma depletions in the dawn sector were unexpectedly high around the June and December solstices and extremely low near the March and September equinoxes. Dawn sector measurements from solar minimum years 1996-1997 exhibit similar seasonal and longitudinal distributions, but occurrence rates are significantly lower. While our analysis suggests that prevailing low levels of solar EUV flux and driving electric fields establish conditions favorable for the growth of postmidnight depletions, the primary causes of observed seasonal-longitudinal distributions remain unresolved.
机译：前推出的通信/导航故障预测系统(C / nof)卫星,赤道等离子体泡沫(epb)视为postsunset现象。最小的平面朗缪尔探针(PLP)C / nof卫星发现很少环境保护局日落;观察当地午夜和黎明之间。利用等离子体密度的悠久历史类似的传感器测量的防守气象卫星计划(DMSP)飞船,以确定这种变化是否典型的太阳能最小值或独特现在安静的时间延长。DMSP发生上部的等离子体消逝在黎明部门是出人意料的在6月和12月二至点和高极低的在3月和9月春分和秋分。最低1996 - 1997年表现出类似的季节性和纵向分布,但发生率显著降低。表明,流行的低水平的太阳能EUV通量和驱动电场建立发展的有利条件postmidnight消逝,的主要原因观察seasonal-longitudinal分布仍然没有解决。

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