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Quantification of solar wind parameters from measurments by SOHO and DSCOVR spacecraft s during series of Interplanetary Coronal Mass Ejections in the helioactive period September 2-15, 2017. Tassev Y., P.I.Y. Velinov , D. Tomova * , A . M ish ev **
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Quantification of solar wind parameters from measurments by SOHO and DSCOVR spacecrafts during series of Interplanetary Coronal Mass Ejections in the helioactive period September 2-15, 2017 • Tassev Y., P.I.Y. Velinov, D. Tomova*, A. Mishev** • Institute for Space Research and Technology, Bulgarian Academy of Sciences • * Sofia University, Faculty of Mathematics and Informatics, Sofia, Bulgaria • ** Space Climate Research Unit, University of Oulu, Finland
a b c Fig.1 a) and b) : Development of sunspot groups - Active Regions AR12673 and AR12674 for 24 hours -on September 2 and September 3. c) Visualization by the NLIL - NOAA (WSA) model of the first shock wave from CME and the second shock wave from the CME on September 6, from the sunspot group 2673 spreading to Earth.
Fig. 2 a) The event on September 10, 2017 in the interplanetary space and the third CME, accompanied by: b) powerful X-ray eruption class X8.2 at 16:06 UTC and c) radiation flux of high energy protons >= 10 MeV, >= 50 MeV and >= 100 MeV. a b c
Fig. 3 a) Impact on Earth and its magnetosphere; Kp indexes during the G4 Severe geomagnetic storm on September 7-8, 2017 b) Forbush decrease of Galactic Cosmic Rays caused by September 7th CME and Solar Cosmic Ray increase – i.e. the Ground Level Event № 72 (GLE72) caused by September 10th flare X8.2. c) GLE 72 by NM data
Fig. 4. Calculations of the solar wind parameters from measurments by SOHO and DSCOVR : the kinetic (dynamic) energy density Ek, thermal energy density Et and magnetic energy density Em during the investigated period September 2-15, 2017
