Non-thermal hydrogen line emission caused by an oblique incident proton beam through charge exchange

Details Non-thermal hydrogen line emission caused by an oblique incident proton beam through charge exchange Non-thermal hydrogen line emission caused by an oblique incident proton beam through charge exchange

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...330..351z&link_type=abstract

Astronomy and Astrophysics, v.330, p.351-358 (1998)

Astronomy and Astrophysics

Astrophysics

10

Line: Profiles, Atomic Processes, Sun: Flares

Scientific paper

In this paper, formulae are given for computing the non-thermal emission of superthermal hydrogen atoms generated through charge exchange by the bombardment of the solar atmosphere by an oblique incident proton beam with a given pitch angle. Specifically, we discuss the non-thermal emission of hydrogen in Lyalpha , Lybeta , and Hα lines and find that the profiles of these lines are quite different from the ones caused by bombardment by a proton beam moving vertically. The intensity and the asymmetry of the non-thermal emission profiles strongly depend on the beam pitch angle alpha and on the angle theta between the direction of magnetic field and the line of sight. By computing the thermal emission under the semi-empirical flare atmospheric models F1, F2, and the quiet-Sun atmospheric model C, we compare the relative importance of thermal and non-thermal emission. For the Hα line, the non-thermal emission, with the proton flux used, is too small to be detectable; for the Lyalpha line, the contribution of non-thermal emission to the line wings is smaller than the one of a vertical beam; while for the Lybeta line, line wing enhancement and broadening are significant. Thus, Lybeta line is a good diagnostic tool for non-thermal proton beam bombardment.

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