PMO OpenIR  > 太阳活动的多波段观测研究团组
Flare-plasma diagnostics from millisecond pulsations of the solar radio emission
Melnikov, VF ; Fleishman, GD ; Fu, QJ ; Huang, GL
2002
Source PublicationASTRONOMY REPORTS
ISSN1063-7729
Volume46Issue:6Pages:497—514
AbstractTwo solar radio bursts exhibiting narrow-band millisecond Pulsations in intensity and polarization are analyzed. There were considerable time delays between the left- and right-circularly polarized components of the radio emission. The observed oscillations of the degree of polarization are due to the different group velocities of the ordinary and extraordinary modes in their propagation from the source to the observer; the frequency dependence of the delay is in excellent agreement with the theoretically calculated group delay in a magnetoactive plasma. It unambiguously follows that the pulsed radio emission is generated near the double upper hybrid frequency by the nonlinear plasma mechanism, since the source emission has a low degree of polarization. In addition to dispersion effects, a Fourier analysis also reveals effects associated with the source inhomogeneity. We detected a frequency drift Of Pulsations (autodelays) with different signs for different polarization components. This drift suggests that, apart from the dispersion effects, there are also the effects related to inhomogeneity of the radio source. It is shown, in particular, that the upper hybrid modes (generating the radio emission) are unstable in regions with enhanced gradients of the plasma density and/or magnetic field. (C) 2002 MAIK "Nauka/Interperiodica".
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7907
Collection太阳活动的多波段观测研究团组
Recommended Citation
GB/T 7714
Melnikov, VF,Fleishman, GD,Fu, QJ,et al. Flare-plasma diagnostics from millisecond pulsations of the solar radio emission[J]. ASTRONOMY REPORTS,2002,46(6):497—514.
APA Melnikov, VF,Fleishman, GD,Fu, QJ,&Huang, GL.(2002).Flare-plasma diagnostics from millisecond pulsations of the solar radio emission.ASTRONOMY REPORTS,46(6),497—514.
MLA Melnikov, VF,et al."Flare-plasma diagnostics from millisecond pulsations of the solar radio emission".ASTRONOMY REPORTS 46.6(2002):497—514.
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