Evidence of impact of earthquakes on geomagnetic and ionospheric activity during spotless sun

---

作者

Tamara Gulyaeva¹

1. IZMIRAN

会议/活动

5th ISEE Symposium, Toward the Future of Space–Earth Environmental Research, November 2022 (Nagoya, Japan)

海报摘要

We investigate the geomagnetic and ionospheric effects of seismic activity during 1810 Sun spotless days (SSL) from 1995 to 2020. Newly developed 1h geomagnetic index Hpo and the ionospheric Weq index are used for the comparisons with the daily peak earthquake Mw. The ionosphere Weq index is derived at the EQ epicenter from JPL GIM-TEC map. Superposed epoch analysis is used with the zero epoch time t0 taken at EQ. It is found that the magnitude of Hpo(t0) is always less that the both peaks of Hpo(preEQ) and Hpo(afterEQ). Similar effect is observed with the peak of the absolute values of |W(preEQ)| and |W(afterEQ)| the both exceeding |WEQ|. The seismic activity tends to increase towards the solar minimum when SSLs occur. Our results provide evidence that EQ-related geomagnetic and ionospheric activities experience decline of intensity at the time of EQ under SSL.

关键词

Earthquake, Geomagnetic index, Ionospheric index, Sun spotless days

研究领域

Earth Sciences, Astronomy and Planetary Sciences

参考文献

1. Yamazaki, Y., Matzka, J., Stolle, C., Kervalishvili, G., Rauberg, J., Bronkalla, O., Morschhauser, A., Bruinsma, S., Shprits, Y.Y., Jackson, D.R., 2022. Geomagnetic activity index Hpo. Geophysical Research Letters, 49, e2022GL098860, https://doi.org/10.1029/2022GL098860
2. Gulyaeva, T.L., Haralambous, H., Stanislawska, I. 2021. Persistent perturbations of ionosphere at diminution of solar and geomagnetic activity during 21-24 solar cycles. J. Atmos. Solar-Terr. Phys., 221, 105706, https://doi.org/10.1016/j.jastp.2021.105706
3. Gulyaeva, T.L. 2022. Decline of geomagnetic and ionospheric activity at earthquake during spotless Sun. Adv. Space Res. https://doi.org/10.1016/j.asr.2022.10.069 •

基金

暂无数据

补充材料

暂无数据

附加信息

利益冲突

No competing interests were disclosed.

数据可用性声明

The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.

知识共享许可协议

Copyright © 2022 Gulyaeva. This is an open access work distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.