首页|Dreicer Electric Field Definition and Runaway Electrons in Solar Flares
Dreicer Electric Field Definition and Runaway Electrons in Solar Flares
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
维普
We analyze electron acceleration by a large-scale electric field E in a collisional hydrogen plasma under the solar flare coronal conditions based on approaches proposed by Dreicer and Spitzer for the dynamic friction force of electrons.The Dreicer electric field EDr is determined as a critical electric field at which the entire electron population runs away.Two regimes of strong(E ≤ EDr)and weak(E≤EDr)electric field are discussed.It is shown that the commonly used formal definition of the Dreicer field leads to an overestimation of its value by about five times.The critical velocity at which the electrons of the"tail"of the Maxwell distribution become runaway under the action of the sub-Dreiser electric fields tums out to be underestimated by √3 times in some works because the Coulomb collisions between runaway and thermal electrons are not taken into account.The electron acceleration by sub-Dreicer electric fields generated in the solar corona faces difficulties.
acceleration of particlesSun:flaresPhysical Data and Processes
Yu.T.Tsap、A.V.Stepanov、Yu.G.Kopylova
展开 >
Crimean Astrophysical Observatory of the Russian Academy of Sciences,Nauchny,298409,Russia
Pulkovo Observatory of the Russian Academy of Sciences,Pulkovskoje Shosse,65/1,St.Petersburg,196140,Russia
Russian Foundation for Basic ResearchCzech Science FoundationRussian Science Foundation
万方数据
维普
