Physics – Optics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..383s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 2, Feb. 1987, p. 383-388.
Physics
Optics
10
Fabry-Perot Interferometers, Interstellar Matter, Radial Velocity, Radii, Solar Corona, Stellar Spectrophotometry, Fiber Optics, Interplanetary Dust
Scientific paper
During the July 31, 1981 eclipse, F-corona interferograms were obtained near the 5184-A Mg I line covering the 3-7 solar radius region. A Fabry-Perot etalon in the exit pupil and a contact fiber-optic intensifier were used, the instrumental FWHM being 0.5 A = about 30 km/s. Radial velocities of interplanetary dust were obtained measuring Doppler shift of absorption lines. A prograde Keplerian velocity component was found, giving after averaging Vr = (5.4 + or - 0.7)R/solar radius + (5 + or - 4) km/s, as well as a retrograde motion. At 6-7 solar radius near the north coronal hole, a local stream with Vr = +130 km/s was observed. Although at large distances from the sun the sky brightness exceeds that of the F-corona, absorption lines are absent, so the sky brightness continuous component is predominant, and the K-corona scattered light may be its main source.
Aimanov A. K.
Shcheglov Petr V.
Shestakova L. I.
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