Observations of large-scale plasma convection in the magnetosphere with respect to the geomagnetic activity level


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Abstract

The data of the ionospheric observations (the daily f plots) at the Yakutsk meridional chain of ionosondes (Yakutsk–Zhigansk–Batagai–Tixie Bay) with sharp decreases (breaks) in the critical frequency of the regular ionospheric F2 layer (foF2) are considered. The data for 1968–1983 were analyzed, and the statistics of the foF2 break observations, which indicate that these breaks are mainly registered in equinoctial months and in afternoon and evening hours under moderately disturbed geomagnetic conditions, are presented. Calculations performed using the prognostic model of the high-latitude ionosphere indicate that the critical frequency break position coincides with the equatorial boundary of large-scale plasma convection in the dusk MLT sector.

About the authors

A. E. Stepanov

Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch

Author for correspondence.
Email: a_e_stepanov@ikfia.sbras.ru
Russian Federation, pr. Lenina 31, Yakutsk, 677007

V. L. Khalipov

Space Research Institute

Email: a_e_stepanov@ikfia.sbras.ru
Russian Federation, Profsoyuznaya ul. 84/32, Moscow, 117997

G. A. Kotova

Space Research Institute

Email: a_e_stepanov@ikfia.sbras.ru
Russian Federation, Profsoyuznaya ul. 84/32, Moscow, 117997

M. S. Zabolotskii

Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch

Email: a_e_stepanov@ikfia.sbras.ru
Russian Federation, pr. Lenina 31, Yakutsk, 677007

I. A. Golikov

Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch

Email: a_e_stepanov@ikfia.sbras.ru
Russian Federation, pr. Lenina 31, Yakutsk, 677007

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