The systematic radial downflow in the transition region of the quiet sun from limb-to-limb observations of the C IV resonance lines

Details The systematic radial downflow in the transition region of the quiet sun from limb-to-limb observations of the C IV resonance lines The systematic radial downflow in the transition region of the quiet sun from limb-to-limb observations of the C IV resonance lines

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..693r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. 693-697.

Computer Science

Sound

27

Line Spectra, Resonance Lines, Rocket Sounding, Solar Corona, Solar Limb, Carbon, Line Of Sight, Solar Rotation, Ultraviolet Spectra, Velocity Distribution, Wavelengths

Scientific paper

This paper presents absolute velocities of C IV 1548, 1550 nm measured as a function of position along the solar equator, which was free of both active regions and coronal holes, and uniformly representative of the quiet sun. These observations were made with moderate spatial resolution (18 arcsec) using an EUV spectrometer dedicated to measuring absolute wavelengths (velocities) by direct comparison with a platinum spectrum generated on board the sounding rocket. On the assumption that systematic horizontal motions cancel statistically so that the line-of-sight velocities approach zero at the limb, a net radial downflow of 7.5 + or - 1.0 km/sec was found. The assumption was tested using the wavelength reference and found to be valid within the absolute accuracy of the rest wavelengths of the C IV lines.

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