暗条上升运动与电场直接加速  

The Ascending Motion of the Filament and the Direct Electric Field Acceleration

作　　者：吴桂平[1] 许敖敖[2] 

机构地区：[1]南京铁道医学院物理教研室,南京210009 [2]南京大学天文系,南京210093

出　　处：《天文学进展》2000年第1期29-37,共9页Progress In Astronomy

基　　金：国家自然科学基金!19791090

摘　　要：位于活动区磁中性线上方的暗条，随着活动区光球物质运动和磁结构演化，其上升运动规律呈多样性。根据暗条上升运动的特征，一般将其分为两类；第一类为缓慢上升（速度为ｋｍ·ｓ－１量级），在暗条上升过程中，亚电场加速电子能量为几十～１００ｋｅＶ量级（Ｅ ＜＜ ＥＤ，Ｅ为暗条表面电场强度，ＥＤ为经典Ｄｒｅｃｉｅｒ场）；第二类为快速上升（速度为几十～几百ｋｍ·ｓ－１量级），因暗条快速上升在其下方形成Ｘ型中性点，暗条回路能量不断传输给电流片口路，通过磁重联产生的强电场加速电子和离子（Ｅ ＞＞ ＥＤ， Ｅ为１０３Ｖ· ｍ－１量级），加速粒子的最大能量取决于重联区域的磁结构。The filaments, which locate above the magnetic neutral line in the active regions, have the different properties of the ascending motion with the motion of the optical matter and the evolution of the magnetic structure. The ascending motion may be ciassified into two sorts. One rises slowly(the velocity of the order 1km's-1). In the ascending process of the filament, subelectric fields energize the electron to the energy around 10 to 100keV(E << ED, E is the electric field inside the surface of the filament, ED is the classical Drecier field). Another rises fast(the velocity of the order around the several decades to several hundreds km's-1) . The neutral poillt is formed below the fast ascending filament. The energy is transferred from the filament circuit to the curreds sheet circuit. The strong electric field induced by the magnetic reconnection accelerates the electrons and the ions(E>>ED, E of the order 103V· m-1). The maximum energy of the particles is decided by the magnetic structure of the reconnection regions.

关 键 词：太阳 暗条 上升运动 耀斑 电场加速 

分 类 号：P182.9[天文地球—天文学] P182.52