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A study of non-thermal radio emission features using fine spectral BAO and high-sensitivity RATAN observations of a solar active region
Yasnov, LV; Bogod, VM; Fu, Q; Yan, Y
2003-08-01
发表期刊SOLAR PHYSICS
卷号215期号:2页码:343-355
摘要Based on spectral observations of active region NOAA 8545 on 19 May 1999, we describe the processes responsible for non-thermal long-lasting radio emission and for narrow-band non-drifting bursts observed at the same time. Non-thermal long-lasting radio emission consisted of two components: short-duration (1 - 2 s) microbursts with fluxes about 0.001 s. f. u. and continuum emission with growing spectrum in the range of 1000 - 2000 MHz. Energetic electrons continuously existed in the active region for more than 2.2 hours. The nature and parameters of microbursts were discussed by Bogod, Mercier, and Yasnov (2001). Here we consider the continuum source nature. It is shown that the model, taking into account the cyclotron loss-cone instability of hot electrons and the generation of plasma waves at the upper hybrid frequency, may explain the observed continuum source parameters. For the narrow-band non-drifting bursts we consider two models: the first taking into account an excitation of weak shock waves across the magnetic field and the second with an excitation of the upper hybrid waves under the double plasma resonance. Continuum source parameters are close to the last model. Our estimations for the magnetic field strength are as follows: H = 120 - 126 G, which is valid for the region where the electron density of background plasmas n = (1.4 - 1.9) x 10(9) cm(-3); H = 180 - 190 G for the region where n = (3.0 - 4.3) x 10(9) cm(-3); H = 290 G for the region where n(e) = 2.5 x 10(10) cm(-3); and H = 350 G for the region where n(e) = 3.5 x 10(10) cm(-3). The speed of the fast electrons is about 0.10 - 0.14 c.
收录类别SCI
语种英语
WOS记录号WOS:000185229800010
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被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8418
专题太阳物理研究部
作者单位1.St Petersburg State Univ, Radiophys Res Inst, St Petersburg 198504, Russia
2.Chinese Acad Sci, Beijing Astron Observ, Natl Astron Observ, Beijing 100012, Peoples R China
3.Russian Acad Sci, Special Astrophys Observ, St Petersburg 196140, Russia
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Yasnov, LV,Bogod, VM,Fu, Q,et al. A study of non-thermal radio emission features using fine spectral BAO and high-sensitivity RATAN observations of a solar active region[J]. SOLAR PHYSICS,2003,215(2):343-355.
APA Yasnov, LV,Bogod, VM,Fu, Q,&Yan, Y.(2003).A study of non-thermal radio emission features using fine spectral BAO and high-sensitivity RATAN observations of a solar active region.SOLAR PHYSICS,215(2),343-355.
MLA Yasnov, LV,et al."A study of non-thermal radio emission features using fine spectral BAO and high-sensitivity RATAN observations of a solar active region".SOLAR PHYSICS 215.2(2003):343-355.
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