The seven components of H alpha and the 9873 MHz line

Details The seven components of H alpha and the 9873 MHz line The seven components of H alpha and the 9873 MHz line

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...58...17z&link_type=abstract

Solar Physics, vol. 58, June 1978, p. 17-29.

Physics

1

Chromosphere, H Alpha Line, Line Spectra, Microwave Emission, Microwave Spectra, Solar Spectra, Stellar Models, Atmospheric Models, Atmospheric Stratification, Photoionization, Radiative Transfer, Recombination Reactions, Solar Physics

Scientific paper

An attempt is made to show in the first approximation that a hypothesis concerning redistribution of populations among the substates of the n 2 and n 3 states of hydrogen according to their degree of degeneracy is justified for conditions pertaining to the chromospheric layers where the H-alpha line core originates. The validation of this hypothesis demonstrates that the photons of the seven H-alpha lines share a common depth scale and source function. The radiation fields given by solutions for a five-level model atom are used to evaluate the radiative rates in the components, and the steady-state equations are solved on the basis of these rates. The results indicate that the population of the 2S(1/2) metastable substate remains equal to half the population of the 2P(3/2) substate at least up to the middle of the upper chromosphere. It is concluded that in the framework of one-component plane-parallel chromospheric models the 9873-MHz (3.04-cm) line will not be observable in the quiet-sun radio spectrum.

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