On the nature of bright rims of filaments

Details On the nature of bright rims of filaments On the nature of bright rims of filaments

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995soph..160...19h&link_type=abstract

Solar Physics, Volume 160, Issue 1, pp.19-28

Physics

12

Scientific paper

A filament with a very bright rim was observed in the Hα line on May 11, 1989, using the Meudon spectroheliograph. Absolute calibration of the spectroheliogram allows us to express the intensities in particular sites of the filament, in its bright rim and inside the surrounding chromosphere. From a large number of photometric scans, we obtained a histogram of the intensity excess of the bright rim relative to the quiet chromosphere. The mean value of this excess amounts to about 4%. We present a theoretical explanation of bright rims, based on the nature of Hα radiative diffusion in the filaments. Computed NLTE model of the filament leads to a rim intensity excess which is in good agreement with our observations.

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