On the Lyman α and O VI Line Profiles in Streamers and Coronal Holes

Details On the Lyman α and O VI Line Profiles in Streamers and Coronal Holes On the Lyman α and O VI Line Profiles in Streamers and Coronal Holes

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ssrv...87..349z&link_type=abstract

Space Science Reviews, v. 87, Issue 1/2, p. 349-352 (1999).

Physics

1

Sun: Corona, Sun: Uv Radiation, Line Profiles, Sun: Solar Wind

Scientific paper

The profiles of the Lyα line at 1215.6 Å and of the O VI doublet at 1031.9 Å and 1037.6 Å 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 α 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.

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