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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A statistical study of the response of the dayside equatorial F_2 layer to the main phase of intense geomagnetic storms as an indicator of penetration electric field
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A statistical study of the response of the dayside equatorial F_2 layer to the main phase of intense geomagnetic storms as an indicator of penetration electric field

机译：统计研究的光面的反应赤道₂层强烈的主要阶段渗透的地磁风暴作为指标电场

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The response of the dayside equatorial F_2 layer to the main phases of the22 intense geomagnetic storms (Dst < —150 nT) in 1998-2008 is investigated usingthe digital ionosonde data from the equatorial stations in Brazilian, Indian, and Australian longitudes together with equatorial electrojet strength and IMF Bz; the storms include 15 superstorms (Dst < —200 nT). The observations show that there is a period during all MPs when the F_2 layer peak rises (and falls) rapidly with large peak electron density (Nmax) reduction, the rise velocity strongly correlates with the intensity (Dst) of the storms, and the duration of the Nmax reduction corresponds to that of strong eastward electrojet when IMF B_z remains highly negative. The observations indicate the occurrence of strong eastward prompt penetration electric fields (PPEF) during the rapid F_2 layer response. The PPEF drives the F_2 layer peak rapidly upward, which reduces Nmax due to vertical expansion and diffusion. The results therefore suggest that the rapid F_2 layer response (rapid rise (and fall) of peak height (hmax) with large Nmax reduction) observed by ionosondes can be used to detect the occurrence of the daytime eastward PPEF during intense geomagnetic storms irrespective of season and level of solar activity. The data also show two rare events of strong daytime westward electric fields due to disturbance dynamo and/or prompt penetration. The results are important when radars are not available to monitor the occurrence of the PPEF.
机译：的反应的光面赤道₂层the22强烈地磁的主要阶段风暴(Dst < -150元)在1998 - 2008年运用数字ionosonde数据调查赤道站在巴西、印度和澳大利亚经度与赤道电喷流强度和IMF Bz;include 15 superstorms(等等<—200 nT)。观测表明,有一个时期所有议员当₂层峰值上升(下降)迅速与大型电子密度峰值(Nmax)减少,上升速度强烈相关强度(Dst)的风暴,和对应于Nmax持续时间减少强东电喷流当国际货币基金组织的说是仍然是高度负面的。表明向东发生强烈的提示渗透电场(PPEF)期间快速₂层反应。层峰迅速上升,从而降低Nmax纵向扩张和扩散。因此建议快速₂层响应(峰高的快速上升(下降)(hmax)与大Nmax减少)观察到ionosondes可以用来检测发生白天的向东PPEF在激烈不分季节和地磁风暴太阳活动水平。强烈的白天西电气的罕见事件领域由于扰动发电机和/或提示渗透。雷达没有监控PPEF的发生。

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