Title: Effect of solar activity on the Earth's environment
Author: O.A. Sheiner
Affil: Radiophysical Research Institute
Email: rfj@nirfi.sci-nnov.ru
Authors: V.M. Fridman, N.D. Krupenya, E.E. Mityakova, and A.V. Rakhlin
Affils: Radiophysical Research Institute
Abstract: Possible connection between manifestation of solar activity, parameters of upper solar and Earth's atmosphere is studied. The proposed study is based on the data of vertical ionospheric sounding obtained at Ionospheric Observatory "Zimenki" (near Nizhny Novgorod) during periods of XX and XXI cycles of solar activity. There were used a planetary K_p index as parameter of magnetic activity and a deviation of critical frequency of ionospheric layer F2 (f0F2) as parameter of ionospheric diturbances. During the period of high solar activity ionospheric disturbances are grouped for 5-10 days, amplitudes are up to 2.5-3 MHz, whereas during the periods of low solar activity phenomenon of grouped is faint, amplitudes are no more than 1-1.5MHz. Anticorrelation in temporal behaviour of f0F2 and K_p index is observed during the period of high solar activity only. Amplitude of f0F2 deviation is strongly dependent on the velocity value for Coronal Mass Ejections (Loop). In addition, there is a negative derivative in temporal behaviour of f0F2 deviation after CME (Loop) onset and no changes after other types of CME. This work is supported by Russian Foundation for Fundamental Research and the Russian Federal Programme ``Astronomy".