The effects of adiabatic cooling on the rigidity-dependent mean free path of gradual SEP events

Details The effects of adiabatic cooling on the rigidity-dependent mean free path of gradual SEP events The effects of adiabatic cooling on the rigidity-dependent mean free path of gradual SEP events

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh11b0262q&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH11B-0262

Physics

7514 Energetic Particles (2114), 7807 Charged Particle Motion And Acceleration, 7859 Transport Processes

Scientific paper

Solar energetic particles (SEP) experience the effect of adiabatic cooling because of the differential solar wind convection. To study the influence of the adiabatic cooling effect on rigidity, we fit gradual SEP events measured by COSPIN instruments onboard Ulysses spacecraft. We find that the adiabatic energy loss contributes significantly to the interplanetary transport of SEPs, and that the mean free path obtained by fitting energetic particle's transport equation with energy loss is systematically lower than the mean free path without energy loss. We think such adiabatic cooling effect helps to partly correct the mean free path's 'too low' problem discussed by Bieber et al 1994.

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