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

PUBLISHED November 09, 2022 (DOI: https://doi.org/10.54985/peeref.2211p5343774)



Tamara Gulyaeva1

Conference / event

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

Poster summary

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.


Earthquake, Geomagnetic index, Ionospheric index, Sun spotless days

Research areas

Earth Sciences, Astronomy and Planetary Sciences


  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 •


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Additional information

Competing interests
No competing interests were disclosed.
Data availability statement
The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.
Creative Commons license
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.
Gulyaeva, T. Evidence of impact of earthquakes on geomagnetic and ionospheric activity during spotless sun [not peer reviewed]. Peeref 2022 (poster).
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