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Ionospheric Disturbances Over the Indian Sector During 8 September 2017 Geomagnetic Storm: Plasma Structuring and Propagation
Space Weather ( IF 4.288 ) Pub Date : 2021-02-23 , DOI: 10.1029/2020sw002607
L. Alfonsi 1 , C. Cesaroni 1 , L. Spogli 1 , M. Regi 1 , A. Paul 2 , S. Ray 2 , S. Lepidi 1 , D. Di Mauro 1 , H. Haralambous 3 , C. Oikonomou 3 , P. R. Shreedevi 4 , A. K. Sinha 5
Affiliation  

The series of X and M class flares and associated coronal mass ejections that occurred on the first days of September 2017 induced significant perturbations on the low‐latitude ionospheric electrodynamics. On 8 September in the Indian sector, the storm caused a severe modification of the equatorial electrojet (EEJ) with a consequent variation of the ionospheric structuring and dynamics. In our analysis, we propose an original method to isolate and identify EEJ variations from geomagnetic data and we detect the presence of equatorial plasma bubbles (EPB) from L‐band total electron content (TEC) data in order to understand their movement. Our results provide evidence of independent EPBs appearance freshly generated and inherited from a migrating plasma structure. The EPB (or EPBs) occurring in the south of India is/are freshly generated just above the magnetic equator, and is/are likely triggered by the sudden increase of EEJ just before the local sunset, acting as a pre‐reversal enhancement. The EPB appearing in the North‐East Indian region is associated with a migrating structure, resulting in a northward movement with a velocity of about 650 m/s, possibly testifying the passage of a large‐scale traveling ionospheric disturbance. The occurrence of severe post‐sunset scintillations in the northeastern sector suggests a possible cascade process forming small‐scale irregularities from the migrating EPB.

中文翻译:

2017年9月8日印度地区的电离层扰动地磁风暴:等离子体的构造和传播

2017年9月的头几天发生的一系列X级和M级耀斑以及相关的日冕物质抛射引起了低纬度电离层电动力学的显着扰动。9月8日,印度地区的暴风雨对赤道电喷(EEJ)进行了严重改造,从而改变了电离层的结构和动力学。在我们的分析中,我们提出了一种从地磁数据中分离和识别EEJ变化的原始方法,并从L带总电子含量(TEC)数据中检测出赤道等离子体气泡(EPB)的存在,以了解其运动。我们的结果提供了独立的EPB外观的证据,这些外观是新生成并从迁移的血浆结构继承而来的。印度南部的EPB(一个或多个EPB)是刚在磁赤道上方产生的,很可能是由于当地日落之前EEJ突然增加而触发的,起到了逆转前的增强作用。东北印度地区出现的EPB与一种迁移结构有关,导致向北移动的速度约为650 m / s,这可能证明了大规模电离层扰动的通过。东北地区发生严重的日落后闪烁现象,表明可能有级联过程,这是由于迁移的EPB形成了小规模的不规则现象。东北印度地区出现的EPB与一个迁移结构有关,导致以约650 m / s的速度向北移动,这可能证明了大规模电离层扰动的通过。东北地区发生严重的日落后闪烁现象,表明可能有级联过程,这是由于迁移的EPB形成了小规模的不规则现象。东北印度地区出现的EPB与一个迁移结构有关,导致以约650 m / s的速度向北移动,这可能证明了大规模电离层扰动的通过。东北地区发生严重的日落后闪烁现象,表明可能有级联过程,这是由于迁移的EPB形成了小规模的不规则现象。
更新日期:2021-03-16
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