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A Detailed Analysis of the Behavior of the F2-Layer Critical Frequency Prior to Magnetic Storms

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Abstract

A detailed analysis of the dependence of the number of events (deviations of the critical frequency foF2 on the prestorm days from foF2 for quiet geomagnetic conditions) and their intensity on the intensity of the coming storm and solar activity is presented. In order to separate the effects of dependence on different parameters, the solar activity dependence was considered for narrow intervals of the Dst index, which characterizes the storm intensity, whereas the dependence on the storm intensity was considered for narrow intervals of the F10.7 index, which characterizes solar activity. The conclusions on the decrease in the number of these events at an increase in the negative values of Dst (intensification of the storm) and F10.7 (solar activity increase) have been confirmed. It has been found that for the vast majority of situations an increase in the intensity of the considered events at a storm intensification and a decrease at an increase in F10.7 are observed. The analysis of the dependence of the number of foF2 disturbances on the prestorm days with a separation of the effects of different days confirms the results of similar analysis performed by the authors earlier without the data separation on days. Moreover, it has been found that both the number of events (foF2 deviations) and their intensities decrease with distance from the time of the storm onset (with a transition from the zero day to other days).

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  1. Institute of Applied Geophysics, Moscow, Russia

    A. D. Danilov & A. V. Konstantinova

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  1. A. D. Danilov
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  2. A. V. Konstantinova
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Correspondence to A. D. Danilov.

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Translated by A. Danilov

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Danilov, A.D., Konstantinova, A.V. A Detailed Analysis of the Behavior of the F2-Layer Critical Frequency Prior to Magnetic Storms. Geomagn. Aeron. 62, 590–606 (2022). https://doi.org/10.1134/S0016793222050036

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  • DOI: https://doi.org/10.1134/S0016793222050036

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