Eclipse observations of coronal emission lines. I - Forbidden Fe X 6374 A profiles at the eclipse of 16 February 1980

Details Eclipse observations of coronal emission lines. I - Forbidden Fe X 6374 A profiles at the eclipse of 16 February 1980 Eclipse observations of coronal emission lines. I - Forbidden Fe X 6374 A profiles at the eclipse of 16 February 1980

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982japa....3..249s&link_type=abstract

Journal of Astrophysics and Astronomy, vol. 3, Sept. 1982, p. 249-266.

Astronomy and Astrophysics

Astrophysics

13

Radial Velocity, Solar Corona, Solar Eclipses, Solar Rotation, Solar Spectra, Spectral Line Width, Coronal Holes, Emission Spectra, Forbidden Bands, High Dispersion Spectrographs, Iron, Solar Temperature, Spectral Energy Distribution, Sunlight

Scientific paper

Coronal spectra during the total solar eclipse of February 16, 1980, obtained in the 6374 A (forbidden Fe X) line using a multislit spectrograph are discussed. The dispersion of these spectra is 2.5 A/mm. The observed line profiles from 1.1 to 1.7 earth radii, with a spatial resolution of 10 x 22 sq arcsec, yield half-widths that vary from 0.6 A to 2.4 A. A large number of locations are found to have half-widths around 1.3 A, corresponding to a temperature of 4.6 x 10 to the 6th K. If temperatures of the order of 1.3 x 10 to the 6th K are typical of the regions that emit in the forbidden Fe X, then turbulent velocities of approximately 30 km/s are required for the enhanced line broadening. The line-of-sight velocities measured are found to range from +14 km/sec to -17 km/sec. The velocities of most of the locations are less than + or - 5 km/s. It is concluded that the corona does not show any localized differential mass motion and that it co-rotates with the photospheric layers deeper down.

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