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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Different Sporadic-E (Es) Layer Types Development During the August 2018 Geomagnetic Storm: Evidence of Auroral Type (Es_a) Over the SAMA Region
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Different Sporadic-E (Es) Layer Types Development During the August 2018 Geomagnetic Storm: Evidence of Auroral Type (Es_a) Over the SAMA Region

机译：不同的分散e (Es)层类型发展2018年8月磁暴期间:极光的证据类型(Es_a)央行地区

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摘要

Sporadic-E (Es) layers are investigated over five Digisonde stations located inside (Santa Maria and Cachoeira Paulista), boundary (S?o Luís), and outside (Millstone Hill and Port Stanley) the South American Magnetic Anomaly (SAMA) in the course of the 25 August 2018, geomagnetic storm. Data from Digisondes and ground-based magnetometer and a numerical model of the E-region (MIRE) are analyzed to search the roles of neutral winds and electric fields as physical processes responsible for the generation of Es layers. Moreover, it is observed for the first time over Santa Maria a type of Es layer that resembles the Esa detected in the auroral region. The characterization of such signatures in ionograms and the investigations of its formation mechanism are the main focus of this study. Hiss waves activities detected by the Van Allen Probe-B data provide evidence that energetic particle precipitations are the most likely process responsible for this type of Es layer inside the SAMA in the night hours during the geomagnetic storm recovery phase. An attempt is also made to explain the presence of Esq over S?o Luís in terms of the expansion of the Equatorial Electrojet to higher latitudes. Finally, the results bring a new observational and modeling indication of a concomitant action of multiple formation mechanisms in the Es layers development in the American sector during the 25 August 2018, geomagnetic storm.
机译：分散e (Es)调查在5层Digisonde站坐落在圣玛利亚外部(磨石希尔和斯坦利港)南美磁异常(央行)2018年8月25日的地磁风暴。数据从Digisondes和地面磁强计的数值模型E-region(沼泽)分析了搜索的角色中性风和电场物理流程负责代Es层。时间在圣玛利亚的Es层类型像欧洲航天局发现极光的地区。这种签名的特征电离图和其形成的调查机制是本研究的重点。范-艾伦检测到的波活动探测器b数据提供的证据表明,精力充沛过粒子降雨是最有可能的过程负责这种类型的Es层在央行在夜间磁暴复苏阶段。也使得解释收/ S的存在吗?路易斯在赤道的扩张电喷流高纬度地区。结果带来一个新的观察和建模多个相应行动的暗示Es层发展的形成机制在美国部门在2018年8月25日,地磁风暴。

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