Doppler Shifts and Nonthermal Broadening in the Quiet Solar Transition Region: O VI

Details Doppler Shifts and Nonthermal Broadening in the Quiet Solar Transition Region: O VI Doppler Shifts and Nonthermal Broadening in the Quiet Solar Transition Region: O VI

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spd....28.0117w&link_type=abstract

American Astronomical Society, SPD meeting #28, #01.17; Bulletin of the American Astronomical Society, Vol. 29, p.882

Astronomy and Astrophysics

Astronomy

Scientific paper

Using observations from the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) experiment flown on the Solar and Heliospheric Observatory (SOHO ) spacecraft, we have measured Doppler wavelength shifts and nonthermal broadening in the 1032 and 1038 Angstroms emission lines of Ovi and the 1036 and 1037 Angstroms emission lines of Cii. Near Sun center the Cii lines exhibit an average redshift of 2+/-3km s(-1) , consistent with earlier observations in this temperature range. The Ovi emission lines exhibit average Doppler velocities of 5+/-3km s(-1) suggesting the presence of redshifted material at 2.9*E(5) K. For the Ovi lines, the average nonthermal component of the observed line width is 34+/-3km s(-1) . These observations indicate a tendency for brighter regions to have larger average redshifts and line widths than faint features although the relationship is very weak. Preliminary analysis of observations at the limb suggests that the Doppler velocities for Ovi do not approach zero as would be expected for predominately radial motions.

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