Interpretation of H-alpha contrast profiles of active region loops

Details Interpretation of H-alpha contrast profiles of active region loops Interpretation of H-alpha contrast profiles of active region loops

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..830c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. 830-835.

Other

11

Chromosphere, H Alpha Line, Solar Activity, Solar Prominences, Solar Spectra, Spectral Line Width, Doppler Effect, Incoherent Scattering, Optical Thickness, Stellar Models

Scientific paper

It has been shown recently that the observed H-alpha contrast profiles of an active region loop can be matched by theoretical contrast profiles based on a 'cloud' model with four free parameters: optical depth, Doppler width, source function, and line-of-sight velocity. On the other hand, the non-LTE theory of the formation of H-alpha by noncoherent scattering implies that one of these parameters, the source function, can be deduced from the others, provided certain auxiliary quantities are known. This paper examines the consistency between values of the source function inferred by an application of the cloud model and those calculated using non-LTE theory. Of the seven points measured on the loop, satisfactory agreement is found at five, although there is clear disagreement at the other two.

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