Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rspta.281..391j&link_type=abstract
(Royal Society, Discussion on the Physics of the Solar Atmosphere, London, England, Jan. 14, 15, 1975.) Royal Society (London),
Physics
51
Solar Activity, Solar X-Rays, Ultraviolet Spectra, X Ray Spectra, Ion Acoustic Waves, Magnetohydrodynamic Waves, Solar Temperature
Scientific paper
The interpretation of emission measures calculated from EUV and X-ray line intensities is discussed. A general method for deriving the temperature and density structure and energy balance in either the quiet sun or active regions is given. In particular, simple relations are found between the coronal temperature, the pressure in the chromosphere-corona transition region, the conductive flux at that pressure, the mechanical energy dissipated above it, and the radiation losses above it. A range of models for quiet and active regions is given. The rate of change of the mechanical-energy deposition as a function of height is used to find empirical damping lengths which are compared with those expected from either the conduction damping of sound waves or the viscous damping of Alfven waves. The wave frequencies and peak amplitude velocities required to satisfy both the empirical and theoretical damping lengths and energy deposition rates are discussed
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