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Interferometric Observation of the F-Corona Radial Velocities Field Between 3 and 7 R⊚

Published online by Cambridge University Press:  12 April 2016

P.V. Shcheglov ,
L.I. Shestakova  and
A.K. Ajmanov
P.V. Shcheglov
Affiliation:
Sternberg Astronomical Institute, 117234 Moscow USSR
L.I. Shestakova
Affiliation:
Astrophysical Institute, 480068 Alma-Ata USSR
A.K. Ajmanov
Affiliation:
Astrophysical Institute, 480068 Alma-Ata USSR

Abstract

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During the July 31, 1981 solar eclipse, F-corona interferograms near MgI λ 5184 Å were obtained using a Fabry-Perot etalon (FPE) with an FWHM of 0.5 Å (corresponding to 30 km/sec) and an image tube. Radial velocities Vr of the interplanetary dust (i.d.) were measured in different directions.

Both prograde and retrograde motions of i.d. in the ecliptic region is discovered. Most of velocity values do not exceed 50 km/sec. A negative velocity component appears after averaging all Vr for all directions. Its average increases to − 20 km/sec toward the Sun. Some ejections are observed. The strongest (+ 130 km/sec) is located at the north ecliptic pole at a distance of 6 to 7 R⊙.

From the lack of unshifted Fraunhofer lines in the scattered sky light, we conclude that the sky brightness continuous component is predominant and its source is K-corona scattered light in the Earth’ s atmosphere.

Type
I. Zodiacal Light and F-Corona: Observations
Information
International Astronomical Union Colloquium , Volume 85: Properties and Interactions of Interplanetary Dust , 1985 , pp. 77 - 80
Copyright
Copyright © Reidel 1985

References

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