A neutral current sheet with flows: Tearing and stratification modes and modeling of coronal structures

Physics

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Current Sheets, Fine Structure, Magnetohydrodynamic Flow, Solar Corona, Tearing Modes (Plasmas), Solar Activity, Solar Wind, Stellar Structure

Scientific paper

The nature of the solar corona fine structure is studied using a model of a neutral current sheet submerged into the solar wind plasma flow. In the vicinity of the sheet the particle distribution function is a bimaxwellian one and describes a double-velocity flow with a relative velocity less than or = 1. A relation between free parameters (sheet thickness, particle gyroradius, velocity, and pressure in a high-velocity flow) is dependent on r and determines anisotropy in the system. The system is unstable due to excitation of large-scale Weibel-type electromagnetic modes. A tearing mode and a stratification one are observed. The first and the second modes determine islands and rays respectively. Under stable conditions, sheet thickness rapidly decreases in the lower corona with an increase of r, but then in the interplanetary space its value smoothly grows.

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