标题：The Acceleration of Electrons at a Spherical Coronal Shock in a Streamer-like Coronal Field
作者：Kong, Xiangliang; Chen, Yao; Guo, Fan
作者机构：[Kong, Xiangliang; Chen, Yao] Shandong Univ, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Shandong, Peoples R China.; [Kong, Xi 更多
会议名称：14th International Solar Wind Conference (Solar Wind)
会议日期：JUN 22-26, 2015
来源：PROCEEDINGS OF THE FOURTEENTH INTERNATIONAL SOLAR WIND CONFERENCE (SOLAR WIND 14)
摘要：We study the effect of large-scale coronal magnetic field on the electron acceleration at a spherical coronal shock using a test-particle method. The coronal field is approximated by an analytical solution with a streamer-like magnetic field featured by partially open magnetic field and a current sheet at the equator atop the closed region. It shows that the closed field plays the role of a trapping agency of shock-accelerated electrons, allowing for repetitive reflection and acceleration, therefore can greatly enhance the shock-electron acceleration efficiency. It is found that, with an ad hoc pitch-angle scattering, electron injected in the open field at the shock flank can be accelerated to high energies as well. In addition, if the shock is faster or stronger, a relatively harder electron energy spectrum and a larger maximum energy can be achieved.