Статья

GPS TEC response to the 22 July 2009 total solar eclipse in East Asia

Feng DingBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaWeixing WanBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaBaiqi NingBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaLibo LiuBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaHuijun LeBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaGuirong XuInstitute of Heavy Rain China Meteorological Administration Wuhan ChinaMin WangInstitute of Earthquake Science China Earthquake Administration Beijing ChinaGuozhu LiBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaYiding ChenBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaZhipeng RenBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaBo XiongBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaLianhuan HuBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaXinan YueBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaBiqiang ZhaoBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaLi FengQinBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaMin YangBeijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

2010en

ABI

Аннотация

The longest total solar eclipse of this century occurred in East and South Asia on 22 July 2009. The eclipse was accompanied with a medium magnetic storm, whose main phase onset occurred ∼27 min after the passage of the Moon's umbral shadow. Using TEC data from 60 GPS stations, we construct differential TEC maps to investigate the ionosphere response to the solar eclipse in central China in the range of 26°N–36°N, 108°E–118°E (i.e., the magnetic latitude 15°N–25°N). During the eclipse's totality, a “shadow” in the ionosphere shown as TEC depletion area was formed ∼100 km south of the Moon's umbral path with a maximum decrease of 5 TECU. The TEC depletion area moved eastward, following the movement of the totality area with a time lag of ∼10 min. Enhancements of TEC due to the storm are observed after the main phase onset. The relative drop of TEC due to the solar eclipse is evidently larger at lower latitudes than that at higher ones and around noontime than that in the morning. By modeling work, we find that the latitudinal dependence of the TEC response may result from latitudinal variation of magnetic inclination, which influences the diffusion of ionization among different layers. Besides, the local time dependence of TEC response is closely related to the local time variation of background atmosphere density, which affects the electron loss efficiency in the ionosphere.

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Идентификаторы

DOI: 10.1029/2009ja015113

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar