The Response of Geomagnetic Daily Variation and Ionospheric Currents to the Annular Solar Eclipse on 21 June 2020

Liu，Xiaocan1; Chen，Junjie2; Han，Peng3; Lei，Jiuhou2; Dang，Tong2; Huang，Fuqing2; Chen，Huaran1; Jiao，Liguo1; Ma，Xinxin1; Tu，Jiyao1; Lei，Yu1,4; Zhao，Junhao1

2022-06-01

10.1029/2022JA030494

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS   Impact Factor & Quartile

2169-9380

2169-9402

In this study, we examined the response of geomagnetic daily variation and ionospheric currents to the solar annular eclipse that passed through China at 10:00–17:30 LT on 21 June 2020. We utilized geomagnetic field data obtained from the Geomagnetic Network Center of China, Institute of Geophysics, China Earthquake Administration and International Real-time Magnetic Observatory Network, which extend from middle latitudes to equatorial regions in China and surrounding areas. It is found that the eclipse obscuration reduces the intensity of geomagnetic daily variation at most stations as compared with the 5-quiet-day average. The response of geomagnetic daily variation to the solar eclipse depends on local time and latitude. In most shadowed areas of the eclipse, there is a reduction of northward (southward) component of the meridional magnetic daily field (ΔX) below (above) ∼30° magnetic latitudes. The solar eclipse can also induce a decrease of the zonal magnetic field variation (ΔY). Meanwhile, we observed that the solar eclipse reduces the intensity of vertical geomagnetic component (ΔZ) at the stations around the early afternoon aside the eclipse totality. In general, these geomagnetic responses imply that the solar eclipse can reduce the ionospheric solar quiet (Sq) current system. These ionospheric currents and ground geomagnetic field disturbances during the solar eclipse are also verified by a global physical model. The simulation demonstrates that the ionospheric currents in the southern hemisphere, where the solar eclipse does not cover, also have a weak response. Overall, the ionospheric current disturbance induced by the solar eclipse shows a counter-Sq pattern.

annular solar eclipse geomagnetic daily variation ionospheric currents

SCI

English

Others

China Postdoctoral Science Foundation[2018M642525];National Natural Science Foundation of China[41831070];National Natural Science Foundation of China[41904138];National Natural Science Foundation of China[41974083];National Natural Science Foundation of China[42004136];National Natural Science Foundation of China[42174198];National Natural Science Foundation of China[42188101];National Postdoctoral Program for Innovative Talents[BX20180286];

WOS:000805022100001

SPACE SCIENCE

2-s2.0-85132901685

Scopus

1.The Institute of Geophysics,China Earthquake Administration,Beijing,China
2.School of Earth and Space Sciences,CAS Key Laboratory of Geospace Environment,University of Science and Technology of China,Hefei,China
3.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,China
4.School of Earth and Space Sciences,Peking University,Beijing,China

Liu，Xiaocan,Chen，Junjie,Han，Peng,et al. The Response of Geomagnetic Daily Variation and Ionospheric Currents to the Annular Solar Eclipse on 21 June 2020[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2022,127(6).

Liu，Xiaocan.,Chen，Junjie.,Han，Peng.,Lei，Jiuhou.,Dang，Tong.,...&Zhao，Junhao.(2022).The Response of Geomagnetic Daily Variation and Ionospheric Currents to the Annular Solar Eclipse on 21 June 2020.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,127(6).

Liu，Xiaocan,et al."The Response of Geomagnetic Daily Variation and Ionospheric Currents to the Annular Solar Eclipse on 21 June 2020".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 127.6(2022).