The observation and interpretation of the profile of C IV lambda-1548 emitted from a quiet region of the sun

Details The observation and interpretation of the profile of C IV lambda-1548 emitted from a quiet region of the sun The observation and interpretation of the profile of C IV lambda-1548 emitted from a quiet region of the sun

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..557b&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 557-569.

Computer Science

Sound

25

Chromosphere, Conductive Heat Transfer, Oso-8, Solar Corona, Ultraviolet Spectrometers, Angular Resolution, Contrast, Line Spectra, Solar Radiation, Sound Waves, Spectral Resolution, Ultraviolet Photometry

Scientific paper

The average properties of the quiet chromospheric network as seen in the transition region line of C IV at 1548 A have been investigated. Line profile data for the study were taken with the OSO 8 High Resolution Ultraviolet Spectrometer, which has moderate angular resolution, high spectral resolution, and good relative photometric accuracy. The profiles, when classified and averaged according to their intensities, were found to be symmetric and Gaussian in shape at all intensity levels. A marginally significant increase in line width with line intensity was detected but the average relative redshift in the network that has been a feature of other OSO 8 studies was not found. The network-to-cell contrast ratio was of the order of 13:1 with the extreme extending to 50.1. The measured average width of 0.22 A (FWHM) is in good agreement with earlier work. Finally, a theoretical interpretation is presented, based on both the line width measurement and consideration of the profile symmetry properties. It is concluded that acoustic waves alone cannot supply enough energy to balance the radiative and conductive losses from the corona. The data are, however, consistent with heating by Alfven waves.

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