Wave dissipation by ion cyclotron resonance in the solar corona
نویسندگان
چکیده
منابع مشابه
Ion Cyclotron Wave Dissipation in the Solar Corona: the Summed Effect of More than 2000 Ion Species
In this paper the dissipation of ion cyclotron resonant waves in the extended solar corona is Alfve n examined in detail. For the Ðrst time, the wave damping arising from more than 2000 low-abundance ion species is taken into account. Useful approximations for the computation of coronal ionization equilibria for elements heavier than nickel are presented. Also, the Sobolev approximation from t...
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The solar corona is the hot, ionized outer atmosphere of the Sun. Coronal plasma expands into interplanetary space as a supersonic bulk outflow known as the solar wind. This tenuous and unbounded medium is a unique laboratory for the study of kinetic theory in a nearly collisionless plasma, as well as magnetohydrodynamic waves, shocks, and jets. Particle velocity distributions in the solar wind...
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This paper concisely summarizes and critically reviews recent work by the authors on models of the heating of the solar corona by resonance of ions with high-frequency waves (up to the proton cyclotron frequency). The quasilinear theory of pitch angle diffusion is presented in connection with relevant solar wind proton observations. Hybrid fluid-kinetic model equations, which include wave-parti...
متن کاملThe Impact of Uvcs/soho Observations on Models of Ion-cyclotron Resonance Heating of the Solar Corona
We examine the compatibility between theoretical models and observations of the temperatures and anisotropic velocity distributions of hydrogen and minor ions in the solar corona. The UVCS instrument on board SOHO has measured hydrogen kinetic temperatures along lines of sight in coronal holes in excess of 3 10 6 K, and O +5 ion kinetic temperatures of at least 2 10 8 K. In addition, the veloci...
متن کاملIon Cyclotron Diffusion of Velocity Distributions in the Extended Solar Corona
The Ultraviolet Coronagraph Spectrometer (UVCS) aboard the Solar and Heliospheric Observatory (SOHO) has revealed strong kinetic anisotropies and extremely large perpendicular temperatures of heavy ions in the extended solar corona. These observations have revived interest in the idea that the high-speed solar wind is heated and accelerated by the dissipation of ion cyclotron resonant Alfvén wa...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2001
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20010019