Physics – Optics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aspc..205...69k&link_type=abstract
Last Total Solar Eclipse of the Millennium, ASP Conference Series, Vol. 205. Edited by W. Livingston and A. Özgüç. ISBN: 1-58
Physics
Optics
2
Scientific paper
Significantly reduced sky brightness at totality results in an imitation of space conditions. This allows attempts to record spectra of the emission line corona (E-corona) at far distances from the Sun. An instant multi-slit emission line spectrum can provide a record of the coronal velocity field in the range 1.5-3 Rsun, and allows the study the possible regions of the solar wind acceleration. Comparison of grating and Fabry-Perot interferometer eclipse observations is given. Reliability of grating observations followed by a reference spectrum is noted. Concordance of parameters of feeding optics and Fabry-Perot interferometer, simultaneous exposures of a reference spectrum and the coronal one, and correction for the input of the white light corona and instrumental effects are required to get an unambigious interpretation of coronal Fabry-Perot interferograms. Summary of data reduction methods of eclipse "green" line (Fe XIV 5303 r{A}) Fabry-Perot interferograms is presented for the line width (FWHM - full width at half maximum), Doppler shifts and coronal rotation. 95% of profiles have Doppler shifts < 20 km/s-1. Doppler shifts < 40 km/s-1 are not detected. Average FWHM of 0.8 r{A}, 0.9 r{A}, and 1.0 r{A} are found for streamers above active regions, large-scale helmets, and regions with reduced intensity respectively. Prospects for direct coronal rotation researches are discussed.
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