空间科学学报2011，Vol.31Issue(6)：716-724,9.
厘米-分米波段Ⅲ型爆发的统计分析
Statistical Analysis of Type Ⅲ Bursts in the Centimetric-Decimetric Wavelength Region
摘要
Abstract
A statistical analysis of multi-band type Ⅲ bursts observed with the spectrographes in the ranges of 625-150（MHz, 2600N3800MHz and 5200-7600MHz during the 23rd solar cycle （from July 2000 to September 2004） is carried out in the paper. The main statistical results, e.g., distribution of type Ⅲ bursts, duration, frequency drift rate （normal and reverse slopes）, degree of polarization and frequency bandwidth are given. The results indicate that the average values of the frequency drift rates and frequency bandwidths increase with the frequency. The average values of the durations and degrees of polarization are neither constant nor uniform varying over broad frequency extent. Most of type Ⅲ bursts are distributed within the range from 625 to 3800 MHz, and decrease with the increase in frequency. This distribution result means that the places of electron acceleration and energy release are mainly within the decimetric range, and the characteristic of frequency range is possibly related with the magnetic configuration on decimetric wavelengths, and the position of the electron acceleration in the reconnection region of magnetic field nearby the place of the main flare. However, there are large number type Ⅲ bursts in the range of 5200-7600MHz. This diagnostic means that the place of electron acceleration is in the broad range of the corona. The radiation mechanisms of type Ⅲ bursts on centimetric-decimetric wavelengths most probably include the coherent plasma radiation or the emission processes of electron cyclotron maser.关键词
太阳射电辐射/多波段Ⅲ型爆发/统计分析Key words
Solar radio radiation/Multi-band type Ⅲ burst/Statistical analysis分类
天文与地球科学引用本文复制引用
马媛,谢瑞祥,郑向民,汪敏,颜毅华..厘米-分米波段Ⅲ型爆发的统计分析[J].空间科学学报,2011,31(6):716-724,9.基金项目
致谢李祝莲博士对本文提供了帮助. （）
