Solar flare Hα impact polarization from high energy electrons?

Fletcher, L. and Brown, J. (1995) Solar flare Hα impact polarization from high energy electrons? Archives of Disease in Childhood, 294, pp. 260-269.

Fletcher, L. and Brown, J. (1995) Solar flare Hα impact polarization from high energy electrons? Archives of Disease in Childhood, 294, pp. 260-269.

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Abstract

In this paper we investigate the possibility of obtaining Hα line linear polarization in solar flares following the excitation of neutral hydrogen by energetic electron beams with a large initial pitch angle. We compare the factors affecting the sign, magnitude and intensity of polarized radiation collisionally excited by electron and proton beams and present a calculation of the polarization which could be observed from an electron beam, using a stochastic simulation to solve the Fokker-Planck evolution equation for the electron beam in the collisionally thick chromosphere, in the presence of a converging magnetic field. We find that polarization from electron beams is possible but requires extreme energy fluxes which are unlikely to be present for any length of time during solar flares.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Fletcher, Professor Lyndsay and Brown, Professor John
Authors: Fletcher, L., and Brown, J.
Subjects:Q Science > QB Astronomy
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Astronomy and Astrophysics
Journal Name:Archives of Disease in Childhood
Journal Abbr.:Astron. Astrophys.
Publisher:B M J Group
ISSN:0003-9888
ISSN (Online):1468-2044

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