Hard X-ray spectral indices in solar flares as probes of the variations of magnetic field topology during a solar cycle.

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Scientific paper

Electron and proton acceleration by a super-Dricer electric field is further investigated in the non-neutral reconnecting current sheet (RCS) with the tangential B_z and transverse magnetic field components Bx varying linearly and exponentially with the distances x and z from the X null-point, respectively. We present semi-analytical estimations of the particle distributions in energy gained at acceleration in an RCS with a strong or weak guiding field By. The accelerated particle spectral indices and their the lower cutoff energies are shown to be dependent on the ratio of the magnetic field components By/Bx and on the exponent index of the transversal magnetic field variations with distance z. This is used for a statistical diagnostics of preferential magnetic field topologies in solar flares in the eras of SMM and RHESSI.

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