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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >On the Pre-Magnetic Storm Signatures in NmF2 in Some Equatorial, Low- and Mid-Latitude Stations
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On the Pre-Magnetic Storm Signatures in NmF2 in Some Equatorial, Low- and Mid-Latitude Stations

机译：在NmF2 Pre-Magnetic风暴签名一些赤道,低收入和中纬度站

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In this paper, the ionospheric quiet-time disturbances otherwise known as Pre-Magnetic Storm Signatures (PMS) have been studied using the F2-layer peak electron density (NmF2) data obtained from 12 Digisonde/ionosonde stations distributed across equatorial, low and mid-latitudes. The datasets used spans the years 2010-2012. Results from this study reveals strong PMS in NmF2 with percentage deviations (ΔNmF2) ranging from ?91% to 500% at the equatorial, low and mid-latitudes, with maxima occurring at the equatorial region. Significant effects on the peak height of the F2-layer (hmF2) were also observed, and they are correlated with the variations in NmF2 particularly at the equatorial station during the PMS. The duration of a PMS is found to be 12-48 h. Although, it was difficult to state clearly the connection between the PMS and the geomagnetic storm that usually follows within 24-48 h; but the NmF2 and hmF2 responses during the PMS were quite similar to those observed during geomagnetic storms. A slight increase in the Solar-wind-plasma speed (>20 km/s) was also observed during PMS. The PMS occur under a southward IMF-Bz, moderate aurora activity (AE ranging from 114 to 560 nT) and quiet ring current (Dst >?10 nT). Therefore, it is pertinent to consider a certain threshold of the aurora indices (AE, AL, and AU) in addition to the Dst, ap, and Kp in the definition of a geomagnetically quiet day. This may eliminate the ambiguity in explaining the ionospheric variability that occurs few days before Sudden Storm Commencement (SSC).
机译：在这篇文章中,电离层安静的时间干扰或称为Pre-Magnetic风暴签名(PMS)研究了使用F2-layer峰电子密度(NmF2)数据获得12 Digisonde / ionosonde站分布在赤道,低中纬度地区。2010 - 2012。经前综合症在NmF2百分比偏差(ΔNmF2)在赤道的? 91%到500%不等,低和中纬度,最大值发生在赤道地区。峰高的F2-layer (hmF2)也观察到,它们是相关的NmF2特别是在赤道的变化站在经前综合症。发现12-48 h。尽管如此,它是困难的国家明确经前综合症之间的连接和的磁暴将随之而来在24 - 48 h;在经前综合症很类似在磁暴期间观察到的。增加太阳风等离子体速度(> 20公里/秒)也观察到在经前综合症。南IMF-Bz,温和的极光活动(AE从114到560元)安静的环电流(Dst > ?是相关的考虑某一阈值的极光指数(AE,艾尔,AU)除了Dst,美联社,Kp的定义眼睛安静的一天。歧义在解释电离层前几天突然变化风暴毕业典礼(SSC)。

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