Effect of geomagnetic disturbances on the spectral and spatial characteristics of VHF scintillation in the north-east of Russia

摘要

Results of measurement of spectra, heights of distribution and the effective sizes of auroral small-scale heterogeneities, received by a method of ionosphere radio scintillations by the signals of orbital artificial satellite at the frequency 150 MHz in the north-east of Russia are given. It was determined, that change of the K-index of magnetic activity is accompanied by the increase of effective height of heterogeneity location and to its appreciable variations. In magnetically disturbed periods we observed the tendency of increase of the effective sizes of heterogeneities at 57 ° - 63 ° N in the afternoon and the general reduction of observation interval (more than 66 ° N) at the northern latitudes. The law of decrease of spectral density of small-scale heterogeneity formations is exponential with the exponent varying from 1,5 up to 6 depending on the disturbance of ionosphere and time of a day.