On the Lyman α and O VI Line Profiles in Streamers and Coronal Holes |
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Authors: | L Zangrilli P Nicolosi G Poletto G Noci |
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Institution: | (1) Dipartimento di Ingegneria Elettronica ed Informatica, Università degli Studi di Padova, I-35131 Padova, Italy;(2) Istituto Nazionale per la Fisica della Materia, Unità di Padova, Italy;(3) Osservatorio Astrofisico di Arcetri, I-50125 Firenze, Italy;(4) Università di Firenze, I-50125 Firenze, Italy |
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Abstract: | 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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Keywords: | Sun: corona Sun: UV radiation line profiles Sun: solar wind |
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