In solar radiophysics,many theories for type Ⅲ bursts have been proposed during the past 60 years.Almost all these theories are based on the plasma hypothesis,which assumes that(i)the radiation is mainly generated by...In solar radiophysics,many theories for type Ⅲ bursts have been proposed during the past 60 years.Almost all these theories are based on the plasma hypothesis,which assumes that(i)the radiation is mainly generated by Langmuir waves via nonlinear processes and(ii)the radiation has frequencies close to the local plasma frequency and/or its second harmonic in the source region. We feel strongly that it is time to advocate an alternative approach without recourse to the plasma hypothesis.This brief discussion explains why.展开更多
I.INTRODUCTION In recent years, the observational technique of solar radio radiation has been developed to a level capable of measuring the position of Type Ⅲ burst in the range of 0.03—1 AU (2 MHz to 30 kHz). The p...I.INTRODUCTION In recent years, the observational technique of solar radio radiation has been developed to a level capable of measuring the position of Type Ⅲ burst in the range of 0.03—1 AU (2 MHz to 30 kHz). The pioneers in this field are Dulk et al. In the period of 1980—1981, they used the radio astronomy receiver on展开更多
The solar radio spectra of the gyro-synchrotron radiation without absorption from mildly relativistic non-thermal electron have been presented using the model with the spherical symmetric nonhomogeneity.These spectra ...The solar radio spectra of the gyro-synchrotron radiation without absorption from mildly relativistic non-thermal electron have been presented using the model with the spherical symmetric nonhomogeneity.These spectra have the following features: (i) Twists and turns of the spectra,which appear at the joint between the medium and high frequencies,(ii) Flux density drop at the lower frequencies.Even if there are no absorption in the radio sources,flux density drop at the lower frequencies is still present because of magnetic nonhomogeneity.(iii) These theoretical spectra belong to C type.This provides us a new interpretation for the observed solar burst C type spectra.展开更多
对第23太阳周的太阳高能粒子、米波段和DH波段Ⅱ型射电暴的爆发时间和高度进行了统计分析。结果表明:耀斑和日冕物质抛射(coronal mass ejection,CME)产生后,先后爆发米波、DH波Ⅱ型射电暴和高能粒子事件,它们爆发的高度也由低到高。米...对第23太阳周的太阳高能粒子、米波段和DH波段Ⅱ型射电暴的爆发时间和高度进行了统计分析。结果表明:耀斑和日冕物质抛射(coronal mass ejection,CME)产生后,先后爆发米波、DH波Ⅱ型射电暴和高能粒子事件,它们爆发的高度也由低到高。米波、DH波Ⅱ型射电暴的爆发时间和高度同太阳高能粒子事件是否发生并无明显关系,但伴随米波段和DH波段Ⅱ型射电暴的CME有更高的产生太阳高能粒子事件的概率。展开更多
基金supported by the National Natural Science Foundation of China(10973043and41074107)the National Basic Research Program of China(2011CB811402)supported in part by the National Central University in Taiwan,China
文摘In solar radiophysics,many theories for type Ⅲ bursts have been proposed during the past 60 years.Almost all these theories are based on the plasma hypothesis,which assumes that(i)the radiation is mainly generated by Langmuir waves via nonlinear processes and(ii)the radiation has frequencies close to the local plasma frequency and/or its second harmonic in the source region. We feel strongly that it is time to advocate an alternative approach without recourse to the plasma hypothesis.This brief discussion explains why.
文摘I.INTRODUCTION In recent years, the observational technique of solar radio radiation has been developed to a level capable of measuring the position of Type Ⅲ burst in the range of 0.03—1 AU (2 MHz to 30 kHz). The pioneers in this field are Dulk et al. In the period of 1980—1981, they used the radio astronomy receiver on
基金Project supported by the National Natural Science Foundation of China.
文摘The solar radio spectra of the gyro-synchrotron radiation without absorption from mildly relativistic non-thermal electron have been presented using the model with the spherical symmetric nonhomogeneity.These spectra have the following features: (i) Twists and turns of the spectra,which appear at the joint between the medium and high frequencies,(ii) Flux density drop at the lower frequencies.Even if there are no absorption in the radio sources,flux density drop at the lower frequencies is still present because of magnetic nonhomogeneity.(iii) These theoretical spectra belong to C type.This provides us a new interpretation for the observed solar burst C type spectra.
文摘对第23太阳周的太阳高能粒子、米波段和DH波段Ⅱ型射电暴的爆发时间和高度进行了统计分析。结果表明:耀斑和日冕物质抛射(coronal mass ejection,CME)产生后,先后爆发米波、DH波Ⅱ型射电暴和高能粒子事件,它们爆发的高度也由低到高。米波、DH波Ⅱ型射电暴的爆发时间和高度同太阳高能粒子事件是否发生并无明显关系,但伴随米波段和DH波段Ⅱ型射电暴的CME有更高的产生太阳高能粒子事件的概率。
