Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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THE X-RAY PULSE FROM SOLAR FLARE AS SOURCE FOR ACTIVE EXPERIMENT IN THE IONOSPHERE
Ruzhin Yu., Sinelnikov V., Kanonidi Kh., Shagimuratov I., Kanonidi K.,

For active space experiments are always known precisely both localization and amplitude of an entered disturbance (whether at a beam particles or mass injection, whether at heating of an ionosphere by EM wave radiation). The nuclear explosion in atmosphere was the maiden active experiment, but the action source was instant and very multicomponent (shock wave, energetic particles and EM radiation with a broadband spectrum) or, in other words, effect was too complex. The solar flare exert mixed action on near Earth space too, but it is clear separated in time (the short pulse of electromagnetic radiation reaches the Earth behind some minutes, then the solar cosmic rays and after one day (or two) the high-velocity flow of plasma arrives) and at space of each components action: ionosphere, polar cap or magnitosphere. Analysis of form and dynamics of the X-ray pulse radiation (data of GOES satellites) from a solar flare (class X17) 28.10.03 shows, that there are all basis to consider it as reference source for active experiment in an ionosphere. For this short pulse of EM radiation the investigation of disturbances (SFE, SID or Crochet) of ionosphere Sq currents system and dynamics of the integral plasma ionosphere contents (or TEC, the data of GPS constellation) for a network of Europe midlatitude stations (IGS and INTERMAGNET) are conducted. The availability of a maximum gradient (up to 15 A/km) of loop currents and sharp increase in TEC on a narrow range of Sun zenith angles (Z0=60?-75?) are shown. It is discussed the observed spatial dependence of such localized disturbance that generated in an ionosphere by short X-ray pulse from a solar flare.





Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004