Extreme Ultraviolet Solar Emission Lines and the Transition Layer between the Chromosphere and the Corona
Year: 1963
Type: article
Abstract: Models of the solar transition layer between the chromosphere and the corona are constructed to give a reasonable explanation for the rocket- and eclipse observations and also for radio emission. Models for the undisturbed sun, both at the sunspot maximum and Jllinimum, and for the active region are proposed in the present investigation. The lower and the higher parts of models for the undisturbed sun are consistent, respectively, with the spicule and the interspicule models previously given by several authors. It is estimated that, at the phase of sunspot maximum, the total area occupied by the active regions is 10 ~ 20 per cent of the whole solar surface, and some 90 per cent of the extreme ultraviolet flux originates in such restricted active regions.
DOI: 10.1093/pasj/15.1.15
Author: Shin Koyama
Institutions: Kagawa University, Kyoto University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W178105848