Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh31b1667j&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH31B-1667
Physics
2101 Coronal Mass Ejections (7513), 2104 Cosmic Rays, 2109 Discontinuities (7811), 2134 Interplanetary Magnetic Fields, 2139 Interplanetary Shocks
Scientific paper
The drivers of Forbush decreases in galactic cosmic ray (GCR) fluxes are thought to be magnetic turbulence in the sheath of an interplanetary coronal mass ejection (ICME) and the closed magnetic field lines in the ICME itself. This model, however, is the result of studies utilizing hourly or longer time averaging. Such averaging can smooth over important correlations between variabilities in the GCR flux and those in the interplanetary medium. To test the validity of the current model of Forbush decreases, we analyze a number of Forbush decreases using high time resolution GCR data from the High Sensitivity Telescope (HIST) on Polar and the Spectrometer for INTEGRAL (SPI). We seek causal correlations between the onset of the decrease and structures in the solar wind plasma and interplanetary magnetic field, as measured concurrently with ACE and/or Wind. We find evidence that planar magnetic structures in the sheath preceding the ICME may be a factor in driving the decrease in at least one event.
Bernard Blake J.
Jordan Peter A.
Mulligan Tamitha Lynne
Shaul Diana N.
Spence Harlan E.
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