Study of Forbush Decrease Event and Associated Geomagnetic Field Variation during Space Radiation Storm

Details Study of Forbush Decrease Event and Associated Geomagnetic Field Variation during Space Radiation Storm Study of Forbush Decrease Event and Associated Geomagnetic Field Variation during Space Radiation Storm

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3597m&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

Transient decrease in cosmic ray intensity followed by a slow recovery typically lasting for several days is identified as Forbush decrease (Fd) event. Such Fd has been recorded by the world grid of neutron monitoring stations. The event was the result of a powerful explosion from sunspot region 9077, which sparked an X-5 class, one of the most powerful solar flare of the ascending phase of solar cycle 23. As a result the geomagentic index Dst decreased upto -300 nT, indicating a large geomagnetic storm and the % Fd decrease has gone to 16% giving rise a cosmic ray storm. Both events coincided with interplanetary conditions. Therefore, a systematic study has been performed to investigate the variation of cosmic ray intensity alongwith the interplanetary and geomagnetic disturbances. Results indicate a strong relationship between geomagnetic activity and Forbush decrease on shortterm basis. 2. Introduction Forbush decrease events (Fds) are transient and rapid decreases in cosmic ray intensity followed by a slow recovery typically lasting for several days. Soon after the discovery of such decreases in cosmic ray intensity by Forbush in 1938 [3], investigators have been searching for the cause of these decreases in the fields and flows emitted from the Sun, as well as their possible correlation with the geomagnetic activity [1,2,6]. It was reported that the high magnetic field regions (blobs) in the interplanetary space are associated with Forbush decrease [1]. Further it has been demonstrated that cosmic ray decreases are not related to the turbulence or random motions in the field, while only the regions of high field strength in interplanetary space are found responsible for causing Forbush decrease. These regions consist of interplanetary magnetic loops (or blobs)/ clouds of ordered field top ology, ejected from active solar regions, interplanetary shocks having comparatively ordered field structure, the turbulent fields in the environ-

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