科研之友
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摘要
Some mechanisms for Joule dissipation of electric currents flowing in partially ionized hydrogen plasmas are analyzed in a three-fluid approximation. It is shown that ambipolar diffusion can be responsible for the annihilation of magnetic flux during collisions of ions with neutral atoms. The relative influences of the electron conductivity and the Cowling conductivity on the magnetic-field annihilation rate are examined in the frameworks of the Sweet-Parker reconnection model. The escape of plasma is an efficient mechanism for cooling current sheets with thicknesses of hundreds of kilometers in the solar chromosphere. The origin of the solar chromospheric jets observed by the Hinode spacecraft is discussed.
- 出版日期2012-2
