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Wave Disturbances in the Near-Surface Atmosphere during Magnetic Storms

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Abstract

The results of data analysis of instrumental observations of microbaric variations in the atmospheric pressure carried out at the Mikhnevo Geophysical Observatory and at the Center for Geophysical Monitoring in Moscow of Sadovsky Institute of Geosphere Dynamics of Russian Academy of Sciences (IDG RAS) during periods of strong geomagnetic disturbances are presented. It was shown from the example of 57 events that, during magnetic storms (index of geomagnetic activity Kр ≥ 5), increased microbaric variations with amplitudes from 2 to 20 Pa in the range of periods of 20–80 min and frequencies close to the Brunt–Väisälä frequency have been observed. It is shown that the spectrum of microbaric variations caused by magnetic storms contains several quasi-harmonic components. The maximum amplitudes of acoustic vibrations fall in the range from 2 to 20 Pa with the maximum amplitudes of the magnetic disturbance from 15 to 200 nT.

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Notes

  1. Coordinates: x is north–south, y is east–west, z is vertically down.

  2. Depending on the significance of the selection at the background level, the lower limit of the recorded frequency range is: for 25 dB—0.00083 Hz, for 5 dB—0.0002 Hz.

  3. In this study we used the complex Morlet wavelet.

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Funding

This study was supported by a State Assignment, project no. AAAA-A-19-119021890067-0.

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Authors and Affiliations

  1. Sadovsky Institute of Geosphere Dynamics, Russian Academy of Sciences, 119334, Moscow, Russia

    A. A. Spivak, Yu. S. Rybnov, S. A. Riabova & V. A. Kharlamov

Authors
  1. A. A. Spivak
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  2. Yu. S. Rybnov
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  3. S. A. Riabova
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  4. V. A. Kharlamov
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Corresponding author

Correspondence to A. A. Spivak.

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Translated by E. Morozov

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Spivak, A.A., Rybnov, Y.S., Riabova, S.A. et al. Wave Disturbances in the Near-Surface Atmosphere during Magnetic Storms. Dokl. Earth Sc. 498, 487–490 (2021). https://doi.org/10.1134/S1028334X21060167

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  • DOI: https://doi.org/10.1134/S1028334X21060167

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