CAOSP abstracts, Volume: 28, No.: 3, year: 1999
- Author(s): GULYAEV, R. A.; SHCHEGLOV, P. V.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 28, no. 3, p. 237-242.
- Date: 03/1999
- Title: Interferometric observations of emission features in the F-corona
- Keyword(s): SOLAR ECLIPSE, SOLAR CORONA, INTERPLANETARY DUST
- Pages: 237 -- 242
Abstract:
We are solving the problem of detection of the resonance emissions of Ca II
ions created by the interplanetary dust sublimation. To this end, a suitable
technique was developed for interferometric observations of the eclipsed sky
around the Sun. Successful observations have been carried out during the
eclipse of February 26, 1998 in Guadeloupe. On the negative obtained, all the
field is covered by an interference pattern adequate to a daytime sky
interferogram. Such a pattern must be due to the double scattering of the
sunlight in the Earth's atmosphere. There is a number of emission features on
the above background. Unshifted K-line of Ca II is seen up to about 10 solar
radii. This is consistent with other evidences on the occurrence of the H and K
emission lines in the coronal spectrum. The most important features on the
photograph are Doppler-shifted K-emissions in the SW-quadrant of the
circumsolar space within the range of 5 to 20 solar radii. The sign of the
Doppler shift corresponds to direction of the planetary orbital motions. That
is why, we suppose that these features just represent the emission associated
with the sublimating dust. If so, it will be said about the discovery of a new
component of the solar corona, namely the `S-corona' (from `sublimation').
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