论文标题
在阿根廷EIA南部峰值附近的地磁风暴期间的传播-F发生
Spread-F occurrence during geomagnetic storms near the southern crest of the EIA in Argentina
论文作者
论文摘要
这项工作首次介绍了在Tucumán-Argentina在地磁风暴期间的电离层不规则发生的分析，这是南美延长纵向部门的一个低纬度站（26.9°S，294.6°E； 294.6°E；磁性纬度15.5°S），在南部的Crest of Southern crest of Equiacation somiate iianiate anomiate Inomation anom san anom anom san anom anom anom anom san anom anom anom anom anom anom anom anom an。 2017年5月27日发生了三场地磁风暴（差异率低的一个月），2016年10月12日（从低率到高现象的过渡率）和2017年11月7日（使用全球定位系统（GPS）接收机和Ionosondes分析了差异率为F的高现象率）。总计总电子含量（TEC）指数（ROTI），GPS电离层L波段闪烁，F层底部（H'F）的虚拟高度和F2层（FOF2）的临界频率的变化速率。此外，每个离子图都需要手动检查是否存在扩散F签名。结果表明，对于所研究的三个事件，地磁活动为启动电离层不规则性创造了有利的条件，这表现为电离图扩散F和TEC波动。由于存在向东干扰发电场（DDEF），因此在午夜后的不规则性发生了。对于五月的暴风雨，向东的过度屏蔽及时穿透电场（PPEF）也在表演。将此PPEF添加到DDEF中，并产生有助于触发不规则性的F区域的提升。更重要的是，在10月和11月，观察到强大的GPS L带闪烁与强范围扩散F（SSF）相关，即不规则性29从底部延伸到F区域的顶部。
This work presents, for the first time, the analysis of the occurrence of ionospheric irregularities during geomagnetic storms at Tucumán-Argentina, a low latitude station in the Southern American longitudinal sector ( 26.9 ° S, 294.6 ° E; magnetic latitude 15.5 ° S), near the southern crest of the equatorial ionization anomaly (EIA). Three geomagnetic storms occurred on May 27, 2017 (a month of low occurrence rates of spread-F), October 12, 2016 (a month of transition from low to high occurrence rates of spread-F) and November 7, 2017 (a month of high occurrence rates of spread-F) are analyzed using Global Positioning System (GPS) receivers and ionosondes. The rate of change of total electron content (TEC) Index (ROTI), GPS Ionospheric L-band scintillation, the virtual height of the F-layer bottom side (h'F) and the critical frequency of the F2 layer (foF2) are considered. Furthermore, each ionogram is manually examined for the presence of spread-F signatures. The results show that, for the three events studied, geomagnetic activity creates favorable conditions for the initiation of ionospheric irregularities, manifested by ionogram spread-F and TEC fluctuation. Post-midnight irregularities are developed due to the presence of eastward disturbance dynamo electric fields (DDEF). For the storm of May, an eastward over-shielding prompt penetration electric field (PPEF) is also acting. This PPEF is added to the DDEF and produces the uplifting of the F region that helps trigger the irregularities. What is more, during October and November, strong GPS L band scintillation is observed associated with strong range spread-F (SSF), that is, irregularities29 extending from the bottom-side to the topside of the F region.
