Computer Science – Performance
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471..753k&link_type=abstract
The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 753-756 (1999).
Computer Science
Performance
Eclipses, Transits, And Occultations, Visible
Scientific paper
Eclipse line profiles of the E-corona (emission line corona) can provide direct data about velocity field in the range 2-4Rsolar which seems to be the most interesting in sense of searching the regions of the solar wind acceleration. As a rule, totality sky brightness is significantly reduced resulting in imitation of space-borne conditions. This allows to record line profiles at far distances. Eclipse ``green'' line (Fe XIV 5303 Å) Fabry-Perot interferograms obtained in 1981 and 1994 revealed fringes at distances of 1.1-1.5Rsolar. Traces of faint emission is seen up to 1.8 Rsolar for the 1981 corona. Reliable profiles corrected for the input of the white-light corona and instrumental effects were selected for analysis of distributions of the line full width at half maximum (FWHM). Both monotone and multimodal distributions are found for the whole corona for maximum and declining phases of solar activity. Hower, different coronal structures show similar quasi-monotone distributions. Average FWHM of 0.8 Å, 0.9 Å, and 1.0 Å are found for streamers above active regions, helmets, and hole respectively. Performances of a portable eclipse instrumentation to get direct spectra in the range 1.5-4Rsolar are presented.
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