On the Lyman alpha and O VI line profiles in streamers and coronal holes

The profiles of the Ly[a] line at 1215.6 A and of the O VI doublet at 1031.9 A and 1037.6 A in the extended solar corona have been analyzed vs. latitude and radial direction, performing observations with the Ultraviolet Coronagraph Spectrometer (UVCS) on board the ESA-NASA solar satellite SOHO (Sola...

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Bibliographic Details
Published in:Space science reviews 1999-01, Vol.87 (1-2), p.349-352
Main Authors: Zangrilli, L, Nicolosi, P, Poletto, G, Noci, G
Format: Article
Language:English
Online Access:Get full text
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Summary:The profiles of the Ly[a] line at 1215.6 A and of the O VI doublet at 1031.9 A and 1037.6 A in the extended solar corona have been analyzed vs. latitude and radial direction, performing observations with the Ultraviolet Coronagraph Spectrometer (UVCS) on board the ESA-NASA solar satellite SOHO (Solar and Heliospheric Observatory). The results show that these lines behave differently with latitude: the H I Ly[a] line has larger full width at half maximum (FWHM) values in the streamer region and narrower values towards the pole, while the FWHM of O VI lines has a minimum at the center of the streamer and slightly increases towards the polar regions. We briefly discuss the impact of the results on coronal heating theories.
ISSN:0038-6308
DOI:10.1023/a:1005174601876