Correlation of magnetohydrodynamic fast shock Mach number with solar energetic particle flux

Details Correlation of magnetohydrodynamic fast shock Mach number with solar energetic particle flux Correlation of magnetohydrodynamic fast shock Mach number with solar energetic particle flux

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh23a1940l&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH23A-1940

Physics

[2114] Interplanetary Physics / Energetic Particles, [2139] Interplanetary Physics / Interplanetary Shocks

Scientific paper

Gradual flux-enhancements of solar energetic particles (SEPs) are associated with interplanetary (IP) shocks driven by coronal mass ejections. Testing of theories/models that are built around shock acceleration mechanisms is difficult due to the complex intensity spectral of SEPs acquired by single-point measurements. In this study, we correlate fast-mode shock Mach numbers derived from a 1.5D magnetohydrodynamics simulation model with the intensity of solar energetic He++ particles acquired by the Solar Isotope Spectrometer on-board the ACE spacecraft during a series of solar flares and coronal mass ejections in 2003 (October 23 - November 2). We found a high positive correlation between the fast-mode shock Mach number (M, for the event with M > 5.0) and SEP flux for higher energy of He++ (E >13.6 MeV) particles. There is an anti-correlation between fast-mode shock's Mach number (M > 5.0) and SEP flux for lower energy of He++ particles (E < 8.13 MeV). This result not only bolsters the causal relationship between IP fast shocks and high-energy SEPs, but also suggests that the Mach number of IP shocks is one of the major controlling parameters for the intensity of high-energy SEPs measured in the near-Earth space.

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