Physics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...44...41d&link_type=abstract
Solar Physics, vol. 44, Sept. 1975, p. 41-53.
Physics
8
Astronomical Spectroscopy, Chromosphere, Cloud Physics, Solar Atmosphere, Astronomical Models, Atmospheric Models, Doppler Effect, Hydrogen Clouds, Optical Thickness, Velocity Distribution
Scientific paper
The cloud model employed in analysis of chromospheric contrast profiles is subject to two criticisms: the source function in the cloud may not be varied independently of the Doppler width in the case of H-alpha and the radiative coupling between the cloud and the underlying atmosphere cannot be ignored. These criticisms are investigated quantitatively with two simple extreme models. It is found that by taking account of both effects, the cloud model may be reinstated. Observed chromospheric features may be understood in terms of clouds of varying parameters embedded in the uppermost regions of a generally undisturbed homogeneous atmosphere. The variable cloud parameters are the optical thickness, Doppler width, bulk velocity, and angular size viewed from the line-forming regions of the underlying atmosphere.
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