Vol. 20, issue 12, article # 14

pdf Romanova E. B., Tashchcilin A. V., Pirog O. M., Polekh N. M., Shi D., Wang X. Manifestation of intensive geomagnetic storms in the ionosphere of East Asia. // Atmospheric and oceanic optics. 2007. V. 20. No. 12. P. 1027-1032.
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This paper describes the intensive geomagnetic storms with the index Dst < (-200 - -300 nT) observed during the period of two last cycles of solar activity. The analysis of variations of ionospheric parameters is based on the use of the measurement data from a network of ionospheric stations located at different latitudes in the longitudinal sector from 60 to 150°E. The results of numerical simulation of ionospheric parameters during the geomagnetic storm in April 2000 are also presented, which show a good agreement of calculations and measurements of critical frequencies in the F2 layer. Long-term negative ionospheric disturbances, observed during geomagnetic storms, may be produced by the change of thermosphere composition.