太阳射电尖峰爆与电子回旋共振吸收

SOLAR RADIO SPIKE BURSTS AND ELECTRON CYCLOTRON RESONANCE ABSORPTION

本文采用等离子体动力学方法，研究了日冕条件下磁化非相对论热等离子体对太阳射电辐射产生的电子回旋共振吸收，并在辐射频率等于电子回旋谐波频率时求得ｎ≥２谐波吸收率的近似表示式，以及其对等离子体温度，出射角度和谐波数的变化规律。在应用部分，讨论了电子回旋共振吸收对于太阳射电尖峰爆发的影响．认为目前观测到的尖峰爆，大多数高能电子束来自日冕的内层。

The electron cyclotron resonance absorption of magnetized thermal plasma using kinetic theory for solar radio emission in coronal condition is described in detail in this paper. An approximate expression for the absorption rate, in the condition of the radio frequency closed to the electron cyclotron harmonic frequency (n≥2) is obtained. Its changing rule with emission angle,plasma temperature and harmonic number n are also found. The influence of the electron cyclotron absorption on the solar radio spike bursts is described as an application example.It is suggested that for the most of recently observated events of spike bursts their energetic electrons are coming from coronal interior layer.