Details

Autor(en) / Beteiligte

• Zangrilli, L
• Nicolosi, P
• Poletto, G
• Noci, G

Titel

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

Ist Teil von

• Space science reviews, 1999-01, Vol.87 (1-2), p.349-352

Erscheinungsjahr

1999

Quelle

SpringerLINK Contemporary (Konsortium Baden-Württemberg)

Beschreibungen/Notizen

• 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.