21 Sep 2022
21 Sep 2022
Status: this preprint is currently under review for the journal ACP.

Latitudinal Dependence of the Geomagnetic and Solar Activity Effect on Sporadic-E layer

Qiong Tang1, Chen Zhou2, Huixin Liu3, Yi Liu2, Jiaqi Zhao1, Zhibin Yu1, Zhengyu Zhao1, and Xueshang Feng1 Qiong Tang et al.
  • 1Institute of Space Science and Applied Technology, Harbin Institute of Technology, Shenzhen, 518500, China
  • 2Department of Space Physics, Wuhan University, Wuhan, 430072, China
  • 3Department of Earth and Planetary Science, Kyushu University, Fukuoka, 819-0395, Japan

Abstract. Based on the global COSMIC occultation data, the latitudinal dependence of the geomagnetic and solar activity effect on the sporadic-E (Es) layer is investigated. Statistical results demonstrate that the relationship between Es layer occurrence rate and geomagnetic activity shows no correlation in low geomagnetic latitudes, a negative correlation in middle geomagnetic latitudes, and a positive correlation in high geomagnetic latitudes. The decrease in Es layer occurrence rate during geomagnetic activity in middle geomagnetic latitudes may be due to the descending meteor rate caused by the atmospheric density change during the geomagnetic storm. While the increase in Es layer occurrence rate in high geomagnetic latitudes is mostly related to the ionospheric electric field change driven by the international magnetic field (IMF) embedded within the solar wind. Solar activity effect on the Es layer also presents latitudinal dependence, with negative correlation in low and middle geomagnetic latitudes and positive correlation in high geomagnetic latitudes. The negative correlation may be owing to the negative correlation between meteor rate and solar activity revealed by many previous studies. The positive correlation in high geomagnetic latitudes is mostly related to the enhanced IMF during solar maximum.

Qiong Tang et al.

Status: open (until 02 Nov 2022)

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Qiong Tang et al.

Qiong Tang et al.


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Short summary
The geomagnetic and solar effect on Es is studied. The negative correlation between Es and geomagnetic activity at mid-latitude is related to the decreased meteor rate during storm period. The increased Es occurrence in high latitude relates to the changing electric field. The positive correlation between Es and solar activity at high latitude is due to the enhanced IMF in solar maximum. The negative correlation in mid and low latitudes relates to the decreased meteor rate during solar activity.