Evidence of a Two-Temperature Source Region in the 3He-Rich Solar Energetic Particle Event of 2000 May 1

Details Evidence of a Two-Temperature Source Region in the 3He-Rich Solar Energetic Particle Event of 2000 May 1 Evidence of a Two-Temperature Source Region in the 3He-Rich Solar Energetic Particle Event of 2000 May 1

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...671..947k&link_type=abstract

The Astrophysical Journal, Volume 671, Issue 1, pp. 947-954.

Astronomy and Astrophysics

Astronomy

10

Acceleration Of Particles, Interplanetary Medium, Sun: Flares, Sun: Particle Emission

Scientific paper

Using instruments on the ACE and Wind spacecraft, we investigate the temporal evolution, spectra, and ionization states of solar energetic particle (SEP) Fe in the impulsive event of 2000 May 1. Proton and electron intensities and anisotropies were used to help constrain the characteristics of the interplanetary propagation, taking into account focusing, pitch-angle scattering, adiabatic deceleration, and convection. We find that the event was nearly scatter-free, with an interplanetary scattering mean free path larger than 1 AU. The Fe spectrum spectral form is consistent with stochastic acceleration, but the observed increase of the ionization state of Fe between 200-600 keV nucleon-1 is larger than can be explained using a single temperature source even after including the effect of adiabatic deceleration in the solar wind. A two-temperature source region is required to fit the observed range of Fe charge states, with the bulk (>80%) of the particles coming from a T~106 K region, and the remainder from a region with T~1.6×107 K.

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