Transient IP Structures Associated with Short-Period Variations in the Solar Energetic Particle and Galactic Cosmic Ray Flux

Details Transient IP Structures Associated with Short-Period Variations in the Solar Energetic Particle and Galactic Cosmic Ray Flux Transient IP Structures Associated with Short-Period Variations in the Solar Energetic Particle and Galactic Cosmic Ray Flux

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh54a..06m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH54A-06

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2114 Energetic Particles (7514), 2139 Interplanetary Shocks, 7513 Coronal Mass Ejections (2101), 7519 Flares

Scientific paper

Short-period variations in the integral SEP ( > 10 MeV) and GCR fluence ( > 100 MeV), often observed in neutron monitor data have also been seen by the High Sensitivity Telescope (HIST) aboard the Polar Spacecraft. Although HIST was designed to measure radiation-belt electrons, it makes clean measurements of the integral SEP and GCR fluence when Polar is outside the radiation belts. These measurements show variability on a variety of timescales including 0.1~mHz - 1~mHz. We examine these variations from Polar and compare them with IMF and plasma solar wind conditions at L1 using ACE data. We find coherent short-term variability occurs when Earth is in close proximity to the HCS and when Earth is either inside an ICME or when an ICME has just transited the Earth. Also, when a flux rope ICME signature is present, the rope axis is nearly parallel to the radial direction and the HCS. The launch of STEREO will enable detailed 3-D analyses of such solar wind disturbances along spatial scales on the same order of typical SEP and GCR proton gyroradii, which are needed to elucidate the mechanism behind this short-period variability.

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