Joint Fitting of the Gamma-Ray Spectrum and Neutron-Capture Line Decay Profile to Constrain Ion Acceleration in Large Flares

Details Joint Fitting of the Gamma-Ray Spectrum and Neutron-Capture Line Decay Profile to Constrain Ion Acceleration in Large Flares Joint Fitting of the Gamma-Ray Spectrum and Neutron-Capture Line Decay Profile to Constrain Ion Acceleration in Large Flares

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh41a0307n&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH41A-0307

Physics

7514 Energetic Particles (2114), 7519 Flares, 7554 X-Rays, Gamma Rays, And Neutrinos, 7594 Instruments And Techniques

Scientific paper

We use the RHESSI (Reuven Ramaty High Energy Solar Spectroscopic Imager) to study solar flare gamma rays that are signatures of the accelerated ions. Specifically, we analyze the prominent 2.2 MeV line due to neutron capture whose time profile depends on the ambient 3He/H ratio, accelerated ion spectral index and incident ion angular distribution. For the first time we fit the 2.2 MeV time profile jointly with a full spectral fit to find a minimum in the total chi-square. This allows for self-consistent constraints on many of the flaring environment parameters, including the energetic particle spectral index, degree of pitch angle scattering, ambient abundances including 3He, accelerated abundances, magnetic field convergence, and the effective angle of the flare. The temporal model consists of a kernel (the response to a delta-function particle injection) convolved with the observed 4-7MeV flux, dominated by prompt nuclear emission. The spectral fitting includes a recently improved model of the nuclear de-excitation continuum.

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