On the continuous radiation and inhomogeneity in the low chromosphere.
Abstract
It is noted that a simple homogeneous chromospheric model cannot consistently explain both the high intensities in the Balmer and visible continua observed just outside the limb during total solar eclipses and the disk intensities in the far IR and EUV. The present paper obtains a first-order approximation of the inhomogeneous atmosphere that simultaneously explains the eclipse, far-IR, and UV observations; this model assumes that the chromosphere is divided into supergranulation-boundary and inner-cell regions. Existing homogeneous models are compared with observations, and the eclipse data are analyzed to determine the physical parameters of the proposed regions. The results indicate that the volume fraction of the boundary region is about 10% in the lower chromosphere and that the boundary region is at least 700 K hotter than the inner-cell region. Two tentative two-component models are evaluated, with attention given to the intensity excess of the hot component in white light and evidence for the presence of cold absorbing matter.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- 1976
- Bibcode:
- 1976PASJ...28..141N
- Keywords:
-
- Atmospheric Models;
- Chromosphere;
- Continuous Radiation;
- Solar Atmosphere;
- Stellar Models;
- Brightness Temperature;
- Infrared Radiation;
- Inhomogeneity;
- Solar Eclipses;
- Solar Limb;
- Ultraviolet Radiation;
- Solar Physics