Relative amplitude of the total electron content variations depending on geomagnetic activity

Details Relative amplitude of the total electron content variations depending on geomagnetic activity Relative amplitude of the total electron content variations depending on geomagnetic activity

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008adspr..42.1231a&link_type=abstract

Advances in Space Research, Volume 42, Issue 7, p. 1231-1237.

Mathematics

Probability

Scientific paper

We developed a method of estimation of a relative amplitude dI/I of the total electron content (TEC) variations in the ionosphere as deduced from the data of the global GPS receivers network. To obtain statistically significant results we picked out three latitudinal belts provided in the Internet by the maximum number of GPS sites. They are high-latitudinal belt (50 80°N, 200 300°E; 59 sites), mid latitude belt (20 50°N, 200 300°E; 817 sites), and equatorial belt (±20°N, 0 360°E; 76 sites). The results of the analysis of the diurnal and latitudinal dependencies of dI/I and dI/I distribution probability for 52 days with different levels of geomagnetic activity are presented. It was found that on average the relative amplitude of the TEC variations varies within the range 0 10% proportionally to the value of the Kp geomagnetic index. In quiet conditions the relative amplitude dI/I of the TEC variations at night significantly exceeds the daytime relative amplitude. At high levels of magnetic field disturbances, the geomagnetic control of the amplitude of TEC variations at high and middle latitudes is much more significant than the regular diurnal variations. At the equatorial belt, on average, the amplitude of TEC variations in quiet and disturbed periods almost does not differ. The obtained results may be useful for development of the theory of ionospheric irregularities.

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