Abstract—In their paper published in Izvestiya, Physics of the Solid Earth, G.A. Sobolev et al. (2020) discussed the results of their study. Firstly, it is noted that the most important element of the magnetic storm affecting seismicity is the Pc5 geomagnetic pulsations. In the context of magnetohydrodynamics, Pc5 are interpreted as standing Alfvén waves. It is perhaps the Alfvén waves that induce oscillations recorded by the authors of the cited paper. Secondly, it is hypothesized that the Pc5 spectrum is contributed by solar 5-min oscillations known in helioseismology. Thus, it is likely that there is yet another channel through which the Sun may affect the Earth and, inter alia, the Earth’s seismicity. Special focus is placed on the question of instrumental noise.
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ACKNOWLEDGMENTS
We are grateful to B.I. Klain and N.A. Kurazhkovskaya for their discussing the impact of the varying geomagnetic field on seismicity. We thank A.S. Potapov for discussing the influence of helioseismic oscillations on the oscillations of the magnetosphere in the Pc5 band. We are also grateful to the reviewers for their valuable comments, in particular, for noting the need to consider the questions concerning instrumental noise.
Funding
The work was supported by the Russian Foundation for basic Research under projects nos. 18-05-00096 and 19-05-00574 and in partial fulfillment of state contracts of Schmidt Institute of Physics o the Earth of the Russian Academy of Sciences.
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Guglielmi, A.V., Zotov, O.D. On Geoseismic Noise and Helioseismic Oscillations. Izv., Phys. Solid Earth 57, 567–572 (2021). https://doi.org/10.1134/S1069351321040054
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DOI: https://doi.org/10.1134/S1069351321040054