The G index of Interplanetary Scintillation Data and its relation to Forbush Decreases During 1991-1994

Details The G index of Interplanetary Scintillation Data and its relation to Forbush Decreases During 1991-1994 The G index of Interplanetary Scintillation Data and its relation to Forbush Decreases During 1991-1994

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh51c1235p&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH51C-1235

Physics

2101 Coronal Mass Ejections (7513), 2104 Cosmic Rays, 2134 Interplanetary Magnetic Fields

Scientific paper

Cosmic ray modulation in the interplanetary medium is a phenomenon being studied for several decades with the aid of plasma and magnetic field data obtained by Satellite close to the Earth. The interplanetary scintillation is a tool that measures the perturbations that the emission of stellar sources suffer when passing through the solar wind close to the Sun, the internal heliosphere, to probe for the passage of large density structures, as well as to measure the turbulence of the medium. The purpose of this work is to analyze a global index of interplanetary scintillation, G, obtained from the g-maps of Cambridge Observatory, UK, and associate it with the occurrence of sudden decreases of the cosmic radiation, known as Forbush decreases, to determine their possible relation. For this purpose we perform a superposed epoch analysis of the G index, with respect to the occurrence of Forbush decreases, registered at Oulu station, Finland, for the period 1991-1994. We found an increase in the value of G coinciding with the occurrence of the Forbush, especially for those events with a fall greater than 10that the G index is representative of the inner structure of the heliosphere, so that it can be useful in studies of cosmic ray modulation.

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