Abstract

The behaviour of the ionospheric F₂-layer during geomagnetic storm is studied using the critical frequency parameter f_oF₂. The magnetic storms of 2nd October 2013 and 22nd June 2015 are considered. The variations of f_oF₂ at Millstone Hill (42.6° N, 288.5° E), Ramey (18.5° N, 292.9° E), Boa Vista (2.8° N, 299.3° E) and Port Stanley (51.6° S, 302.1° E) along the longitude of about 300° E are analysed. The main observations of this study are (1) strong and short term positive storm effects are observed at the beginning of recovery phase for the moderate storm at all the stations and during the main phase for the intense storm at Millstone Hill and Port Stanley, (2) long term negative phase is observed at the northern hemispheric stations for the intense storm and (3) the southern winter hemisphere station Port Stanley recorded positive storm effects during the main and recovery phases of the intense storm on 22-06-2015. The observed deviations in f_oF₂ are discussed in terms of Prompt Penetration Electric Fields, Disturbance Dynamo Electric Fields, Disturbance neutral winds and Travelling Atmospheric Disturbance.

中文翻译：

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地磁风暴对东经300°中低纬度电离层F 2层的影响

摘要

利用临界频率参数f _o F ₂研究了电离层F ₂层在地磁风暴中的行为。考虑了2013年10月2日和2015年6月22日的磁暴。f _o F ₂的变化沿经度在磨石山（北纬42.6°，东经288.5°），拉米（北纬18.5°，南纬292.9°），博阿维斯塔（北纬2.8°，北纬299.3°）和斯坦利港（南纬51.6°，东经302.1°）分析大约300°E。这项研究的主要观察结果是：（1）在恢复期开始时，在所有站点的中度暴风雨期间，以及在密尔斯顿山和史丹利港的强暴风雨的主要阶段，都观察到了强短期短期风暴效应，（ 2）在北半球站观测到强风暴的长期负相位，（3）在冬季南半球站斯坦利港在2015年6月22日的强风暴的主要阶段和恢复阶段记录了积极的风暴效应。在f _o F _2中观察到的偏差 根据瞬态穿透电场，扰动发电机电场，扰动中性风和行进大气扰动对它们进行了讨论。