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Using eclipse observations to search large-scale velocity field in the range2–4R⊙.

 

作者: Iraida S. Kim,  

 

期刊: AIP Conference Proceedings  (AIP Available online 1999)
卷期: Volume 471, issue 1  

页码: 753-756

 

ISSN:0094-243X

 

年代: 1999

 

DOI:10.1063/1.58802

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Eclipse line profiles of the E-corona (emission line corona) can provide direct data about velocity field in the range2–4R⊙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 (FeXIV5303 Å) Fabry-Perot interferograms obtained in 1981 and 1994 revealed fringes at distances of1.1–1.5R⊙.Traces of faint emission is seen up to 1.8R⊙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. AverageFWHMof 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 range1.5–4R⊙are presented. ©1999 American Institute of Physics.

 

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