CAOSP abstracts, Volume: 28, No.: 3, year: 1999

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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