Premium
Does the ion cyclotron exist in the inner corona?
Author(s) -
Raouafi N.E.
Publication year - 2003
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200310120
Subject(s) - physics , solar wind , doppler effect , polarization (electrochemistry) , ion , coronal hole , polar , atomic physics , astrophysics , computational physics , corona (planetary geology) , outflow , anisotropy , polar wind , isotropy , linear polarization , scattering , astronomy , plasma , coronal mass ejection , optics , meteorology , nuclear physics , chemistry , laser , quantum mechanics , astrobiology , venus
The present work is about the interpretation of the linear polarization of the O VI D 2 ( λ 1032) coronal line observed by SUMER/SoHO. We take into account the effect of the Doppler redistribution due to the scattering ions motion. We consider the cases of isotropic and anisotropic velocity field distributions. The latter can be interpreted by the ioncyclotron effect that affects heavy ions in the solar corona. The comparison of the numerical results with the observations yields constraints on the solar wind outflow speed and on the velocity field distribution of the O 5+ ions at low coronal altitudes in the polar holes.