Proton transport in a magnetic loop and Hα impact line linear polarization.

Details Proton transport in a magnetic loop and Hα impact line linear polarization. Proton transport in a magnetic loop and Hα impact line linear polarization.

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...310..629k&link_type=abstract

Astronomy and Astrophysics, v.310, p.629-634

Astronomy and Astrophysics

Astrophysics

7

Sun: Flares, Particle Emission, Transition Region, Mhd

Scientific paper

Using a 1-D test particle model with 350000 numerical protons, we study the evolution of the proton distribution function in a magnetic loop. A continuous injection of low-energy 200-1500keV protons with a distribution function proportional to a E^-3^ power-law is considered. The acceleration region is assumed to be at the top of a flare loop where the protons are injected into a cone of pitch angles centered along the loop axis. The computations are made for a static loop of length 20880km with the parameters in the chromosphere corresponding to the VAL-C model of the solar atmosphere. Coulomb collisions, mirroring, and Alfven wave scattering in an intermediate regime (W_a_^tot^=10^-1^erg/cm^3^) relative to prior analyses corresponding to saturated scattering are taken into consideration. The proton distribution function in the chromosphere at the Hα formation layer is computed. The resulting anisotropy of the proton distribution function in a quasi-stationary state of proton bombardment is analyzed from the point of view of its expected effects on the impact linear polarization of chromospheric lines.

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