Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh22e01o&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH22E-01
Physics
7511 Coronal Holes, 7827 Kinetic And Mhd Theory, 7839 Nonlinear Phenomena, 7843 Numerical Simulation Studies, 7867 Wave/Particle Interactions
Scientific paper
Recent SOHO Ultraviolet Coronagraph Spectrometer (UVCS) observations show that protons and minor ions are hot (Tp>106 K, Ti>107 K) and anisotropic in coronal holes. A possible cause of the large perpendicular motions is unresolved Alfvénic fluctuations in the solar wind. Using the three-fluid 2.5D MHD model we have shown that the unresolved Alfvénic fluctuations lead to apparent proton temperature and anisotropy consistent with UVCS observations. However, \Alfven waves with realistic amplitudes can not reproduce the O5+ perpendicular temperature and anisotropy deduced from UVCS observations. We use the hybrid model to investigate constrains on the anisotropy of the minor ions. Our results suggests that the minor ions are heated and accelerated by high-frequency waves ( ~103 Hz), while proton heating occurs by low frequency waves ( ~10-3 Hz).
Davila Jose Manuel
Ofman Leon
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