Abstract

The Latitudinal dependence in the response of the Ionospheric F2-layer electron density (NmF2) and peak height (hmF2) to three geomagnetic storms of May and August 2010 has been examined. The data-sets used for the study were obtained from Ilorin, Nigeria (1.87° S/76.67° E), San Vito, Italy (34.68° N/90.38° E), Hermanus, South Africa (42.34° S/82.15° E), and Pruhonice, Czech Republic (45.66° N/90.38° E) geomagnetic coordinates. The quiet time result shows that the rise in NmF2 began earlier at San Vito, followed by Pruhonice. The rate of ionization was observed to be highest in Ilorin, while, the rate of decay in NmF2 is faster at Hermanus. For disturbed NmF2 condition, remarkable similarities in the NmF2 responses during geomagnetic storms were recorded from Hermanus in the mid-latitude and Ilorin, an equatorial station. NmF2 enhancements (>6 hours) that is consistent with the increase in hmF2 were observed at all the mid-latitude stations during the main phase of the 02 May, 2010 storm, without any noticeable change over ILN. Similarly, 12 hours of positive phase was observed at ILN and HMN, with 30 hours of NmF2 depletions at PRN and SVT during the recovery phase. ILN is in the equatorial Trough, so most of the NmF2 produced at this region is lifted to the higher latitudes by the fountain effect during the main phase. The suppression of the zonal electric field at ILN is responsible for the NmF2 enhancement during the recovery phase, while the mid-latitude responses have been attributed to the effect of the thermospheric winds and neutral composition changes.

中文翻译：

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低太阳活动期间电离层响应某些地磁风暴的纬度依赖性

摘要

已经研究了电离层F 2 层电子密度 ( NmF 2) 和峰值高度 ( hmF 2 ) 对 2010 年 5 月和 8 月的三个地磁暴的响应的纬度依赖性。用于研究的数据集来自尼日利亚伊洛林 (1.87° S/76.67° E)、意大利圣维托 (34.68° N/90.38° E)、南非赫曼努斯 (42.34° S/82.15° E) ) 和捷克共和国普鲁霍尼采 (45.66° N/90.38° E) 地磁坐标。安静时间结果表明 NmF2 的上升在圣维托较早开始，其次是 Pruhonice。观察到 Ilorin 的电离速率最高，而Hermanus 的NmF 2衰变速率更快。对于扰动的NmF 2 条件，在中纬度的赫曼努斯和赤道站伊洛林记录了地磁风暴期间的NmF 2 响应。在 2010 年 5 月 2 日风暴的主要阶段，在所有中纬度台站都观察到了与hmF 2增加一致的NmF 2 增强（>6 小时），而 ILN 没有任何明显变化。类似地，在 ILN 和HMN观察到 12 小时的正相，在恢复阶段在 PRN 和 SVT 处观察到 30 小时的NmF 2 消耗。ILN位于赤道槽内，因此该区域产生的NmF 2大部分在主相期间被喷泉效应提升到高纬度地区。ILN 区域电场的抑制是造成NmF 的原因2 在恢复阶段增强，而中纬度响应归因于热层风和中性成分变化的影响。