太阳射电观测对日冕磁场和高能电子的诊断

Almost all the solar burst activities are closely related with the magnetic field, they are the results of the interaction of solar atmosphere plasma with magnetic field in essence. Energetic electrons which accelerated during these burst activities will produce various radio emissions and correlated phenomena at the other frequency bands. The observations and comparisons of the radio radiation can supply information about the magnetic field of source area, the electron acceleration, flare energy release process, and the background plasma parameters. Measurement of the coronal magnetic field, in addition to the extrapolation of photosphere magnetic field, radio diagnosis is an important means. The radio diagnosis depends on the emission mechanism, due to the complexity of the mechanism of radio emission and absorption, radio diagnosis method remains to be developed and perfect. Electron cyclotron maser emission (ECME) is an important mechanism of radio radiation. It has been widely used to explain the various phenomena of non-thermal radio radiation. On the basis of theoretical research of ECME, this project we will establish the radio diagnosis model based on cyclotron maser emission mechanism. Furthermore, we will abstract the magnetic field of radiation source and parameters of energetic electrons with the solar radio bursts.

太阳上几乎所有的爆发活动都与磁场密切相关，其本质都是太阳大气等离子体与磁场相互作用的结果。爆发过程中被加速的高能电子会产生各种射电辐射现象，包括其他波段共生现象。对这些射电辐射的观测研究，不仅可以得到辐射源区的磁场信息，还可以给出有关电子加速、耀斑能量释放过程及背景等离子体参数等相关信息。日冕磁场的测量，除了光球磁场的外推，射电诊断是获得日冕磁场信息的重要手段。射电诊断依赖于辐射机制，由于射电辐射和吸收机制的复杂性，日冕磁场的射电诊断方法还有待于发展和完善。电子回旋脉泽辐射作为天体射电辐射的一个重要机制，被广泛应用于解释各种非热射电辐射现象。在前期电子回旋脉泽辐射理论研究的基础上，本项目我们将建立一个基于回旋脉泽辐射机制的射电诊断模型，进一步发展和完善日冕磁场和高能电子相关参数的射电诊断方法，并在此模型下，结合射电爆发观测，反演辐射源区磁场和高能电子相关参数信息。

太阳上几乎所有的爆发活动都与磁场密切相关，爆发过程中产生的高能电子与背景等离子体相互作用，产生各种射电辐射现象。而这些射电辐射现象，不仅携带辐射源区的磁场信息，还包涵有关电子加速、能量释放以及背景等离子体参数等相关信息。基于前期电子回旋脉泽辐射理论研究的基础上，我们将建立日冕磁场射电诊断模型，结合具体射电爆发事件，反演源区磁场及等离子体参数信息。我们研究了电子束从耀斑环顶向下运动时的能量损失及其能谱演化，进而研究其对回旋脉泽辐射的影响，完善其辐射理论。同时，结合尖峰及纤维射电精细结构观测，分析其物理过程及其参数演化特征，探讨射电爆发的辐射机制并反演源区相关参量。