On the relation of the Forbush decreases detected by ASEC monitors during the 23rd solar activity cycle with ICME parameters

Details On the relation of the Forbush decreases detected by ASEC monitors during the 23rd solar activity cycle with ICME parameters On the relation of the Forbush decreases detected by ASEC monitors during the 23rd solar activity cycle with ICME parameters

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010adspr..45..614c&link_type=abstract

Advances in Space Research, Volume 45, Issue 5, p. 614-621.

Physics

3

Scientific paper

To improve the physical understanding of the Forbush decreases (FD) and to explore the Space Weather drivers, we need to measure as much geospace parameter as possible, including the changing fluxes of secondary cosmic rays. At the Aragats Space Environmental Center (ASEC) are routinely measured the neutral and charged fluxes of secondary cosmic rays. Each of species has different most probable energy of primary “parent” proton/nuclei. Therefore, the energy range of the Galactic Cosmic Rays (GCR) affected by Interplanetary Coronal Mass Ejection (ICME) can be effectively estimated using data of the ASEC monitors. We presented relations of the magnitude of FD observed in different secondary particle fluxes to the most probable energy of the primary protons. We investigate the correlations between the magnitude of FD with the size, speed, density and magnetic field of the ICME. We demonstrate that the attenuation of the GCR flux incident on the Earth’s atmosphere due to passing of the ICME is dependent on the speed and size of the ICME and the magnetic field strength.

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