Radio and EUV studies of coronal holes

Details Radio and EUV studies of coronal holes Radio and EUV studies of coronal holes

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978raf....20.1331s&link_type=abstract

(Radiofizika, vol. 20, no. 9, 1977, p. 1331-1337.) Radiophysics and Quantum Electronics, vol. 20, no. 9, Mar. 20, 1978, p. 917-9

Astronomy and Astrophysics

Astronomy

Solar Corona, Solar Radio Emission, Spectroheliographs, Ultraviolet Astronomy, Electron Density (Concentration), Far Ultraviolet Radiation, Heliometers, Satellite-Borne Instruments, Skylab Program, Stellar Models

Scientific paper

Results of coronal-hole observations carried out in the far-UV with a spectro-heliometer aboard Skylab are compared with corresponding results of ground-based radioheliograph measurements performed at frequencies of 80 and 160 MHz. It is found that the electron density derived from the far-UV observations for the transition region and lower corona is nearly three times greater than the value computed on the basis of the radio data. Unsuccessful attempts are made to eliminate this discrepancy by recalibrating the radio data and by recalculating the ionization equilibrium. A substantial local enhancement of the heavy-element abundance in certain parts of the transition region and inner chromosphere is considered as a possible cause of the discrepancy.

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