Solarwind Transient flows and Associated Forbush Decrease

Details Solarwind Transient flows and Associated Forbush Decrease Solarwind Transient flows and Associated Forbush Decrease

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh13b1980k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH13B-1980

Physics

[2104] Interplanetary Physics / Cosmic Rays, [2164] Interplanetary Physics / Solar Wind Plasma, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [7954] Space Weather / Magnetic Storms

Scientific paper

In this study we discuss the behavior of cosmic rays during the phase of highly intense or ultra intense geomagnetic storms, as shocks driven by energetic coronal mass ejections (CME's) and other interplanetary (IP) transients are mainly responsible for initiating large and intense geomagnetic storms. Observational results indicate that galactic cosmic rays (CR) coming from deep surface interact with these abnormal solar and IP conditions and suffer modulation effects. In this paper a systematic study has been performed to analyze the CRI variation during super storms i.e. very intense geomagnetic storms with Dst index ≥ -100 nT. The neutron monitor data of three stations Oulu (Rc = 0.77 GV), Climax (Rc = 2.97 GV) and Huancayo (Rc = 13.01 GV) well distributed over different latitudes and hourly values of IMF parameters derived from satellite observations near Earth IP medium from OMNI Data base is used for the period spanning over solar cycles 20, 21, 22 and 23. It is found that AP and AE indices show rise before the forward turnings of IMF, while the Dst index shows a classic storm time decrease. The analysis indicates that the magnitude of all the responses depends on BZ component of IMF being well correlated with solar maximum and minimum periods. Transient decrease in CRI with slow recovery is observed during the storm phase duration.

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