High-resolution photography of the solar chromosphere. XVI H-alpha contrast profiles of active region loops

Details High-resolution photography of the solar chromosphere. XVI H-alpha contrast profiles of active region loops High-resolution photography of the solar chromosphere. XVI H-alpha contrast profiles of active region loops

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...85..131b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 85, May 1983, p. 131-140.

Physics

13

Astronomical Photography, Chromosphere, Solar Atmosphere, Coronal Loops, Filtergrams, Flow Velocity, H Alpha Line, High Resolution, Line Of Sight, Mass Flow

Scientific paper

High-resolution filtergrams of an active region loop taken at seven wavelengths in Hα have been used to derive the constrast at eleven locations along its length as a function of wavelength. With an appropriate choice of parameters, theoretical curves calculated on the basis of the "cloud" model give a reasonable fit to the observed contrast profiles. The inferred line-of-sight components of the mass velocity range from 27 km s-1 upward to 78 km s-1 downward. However, more accurate profiles and a more rigorous theory are needed to confirm the validity of this application of the cloud model.

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