Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh33b..03z&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH33B-03
Physics
7807 Charged Particle Motion And Acceleration, 2451 Particle Acceleration, 2455 Particle Precipitation, 2723 Magnetic Reconnection (7526, 7835)
Scientific paper
Electron and proton acceleration by a super-Dreicer electric field is investigated in a non-neutral reconnecting current sheet (RCS) with a variable plasma density. The tangential Bz and transverse magnetic field components Bx are assumed to vary exponentially with distances x and z from the X nullpoint; the longitudinal component (a 'guiding field') is accepted constant. Particles are found to gain a bulk of their energy in a thin region close to the X nullpoint where the RCS density increases with z exponentially with the index lambda and the tangential magnetic field Bx also increases with z exponentially with the index alpha. Our simulations show that the spectral indices of accelerated particles gamma are dependent on the indices of transversal field variations alpha and density variations lambda leading to a wide variety (1.5-10) of particle spectral indices deduced from the observations of hard X-rays and gamma-rays in solar flares. This diagnostic tool can be used for the investigation of magnetic field variations in solar flares.
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