Formation of Power Law Tail with Spectral Index-5 Inside and Beyond the Heliosphere

Details Formation of Power Law Tail with Spectral Index-5 Inside and Beyond the Heliosphere Formation of Power Law Tail with Spectral Index-5 Inside and Beyond the Heliosphere

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1039..367g&link_type=abstract

PARTICLE ACCELERATION AND TRANSPORT IN THE HELIOSPHERE AND BEYOND: 7th Annual International Astrophysics Conference. AIP Confer

Astronomy and Astrophysics

Astrophysics

6

Astronomical Observations, Composition, Energy Spectra And Interactions, Particle Acceleration, Flares, Heliopause And Solar Wind Termination, Interplanetary Magnetic Fields

Scientific paper

Suprathermal power law tails, with the unique spectral index of -5, on the velocity distributions (or equivalently of -1.5 on differential intensity) of solar wind and pickup ions are commonly observed in the heliosphere as well as the heliosheath. Here we present additional observations of velocity distributions and differential energy spectra of protons and heavier ions in the heliosheath, and in the heliosphere both during quiet times and in Corotating Ion Events. In particular we examine the energy range where the suprathermal tails roll over and find good agreement with the measured tails using isotropic solar wind frame differential spectra of the form E-1.5 exp[-(m/q)γ•(E/Ec)(1+γ)/2], with only two free parameters that depend on ambient solar wind conditions. We apply these concepts to particle acceleration in the heliosheath and show that the unmodulated Anomalous Cosmic Ray spectra near the heliopause are consistent with being E-1.5(ν-5) tails with a roll-over at Ec = 25 MeV/nucleon.

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