Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh21b1510j&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH21B-1510
Physics
[2104] Interplanetary Physics / Cosmic Rays, [2109] Interplanetary Physics / Discontinuities, [2111] Interplanetary Physics / Ejecta, Driver Gases, And Magnetic Clouds, [2134] Interplanetary Physics / Interplanetary Magnetic Fields
Scientific paper
We interpret galactic cosmic ray (GCR) variations near Earth within a diffusive context. The variations occur on time-/size-scales ranging from Forbush decreases (Fds), to substructure embedded within Fds, to smaller amplitude and shorter duration variations during relatively benign interplanetary conditions. We use high time resolution GCR observations from the High Sensitivity Telescope (HIST) on Polar and from the Spectrometer for INTEGRAL (SPI) and also use solar wind plasma and magnetic field observations from ACE and/or Wind. To calculate the coefficient of diffusion, we combine these datasets with a simple convection-diffusion model for relativistic charged particles in a magnetic field. We find reasonable agreement between our and previous estimates of the coefficient. We also show whether changes in the coefficient of diffusion are sufficient to explain the above GCR variations.
Bernard Blake J.
Jordan Alfons
Shaul D. A.
Spence Harlan E.
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