Abstract
Abstract We obtained that according to the GPS data at altitudes of the topside ionosphere (h >300 km) a flare is able to cause a decrease of the electron content. Using the theoretical model it is shown that the intense transport of O+ ions into the above-situated plasma caused by a sharp increase in the ion production rate and thermal expansion of the ionospheric plasma is a cause of the formation of the negative disturbance in the electron concentration in the topside ionosphere.
Highlights
We obtained that according to the GPS data at altitudes of the topside ionosphere (h > 300 km) a flare is able to cause a decrease of the electron content
Using the theoretical model it is shown that the intense transport of O+ ions into the above-situated plasma caused by a sharp increase in the ion production rate and thermal expansion of the ionospheric plasma is a cause of the formation of the negative disturbance in the electron concentration in the topside ionosphere
The response of the ionosphere to a solar flare is studied on the basis of the observational data and results of theoretical modeling
Summary
We obtained that according to the GPS data at altitudes of the topside ionosphere (h > 300 km) a flare is able to cause a decrease of the electron content. At the ray crossing the shadow region at a height of 240 km (Fig. 1(c)), the TEC grow begins some time after the flare beginning in the soft X-ray range. 1(d)– 1(e)) a decrease in the electron content above the h0 level occurs after the flare beginning (1012 UT) and lasts till 1024 UT, i.e., till the moment of the flare maximum in the soft X-ray range. Copyright c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB
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