We report ground-based, low-frequency (100?MHz) radio imaging, spectral, and polarimeter observations of the type?II radio burst associated with the solar coronal mass ejection (CME) that occurred on 2013 May 2. The spectral observations indicate that the burst has fundamental (F) and harmonic (H) emission components with split-band and herringbone structures. The imaging observations at 80?MHz indicate that the H component of the burst was located close to leading edge of the CME at a radial distance of r ≈ 2 R ☉ in the solar atmosphere. The polarimeter observations of the type?II burst, also at 80?MHz, indicate that the peak degree of circular polarization (dcp) corresponding to the emission generated in the corona ahead of and behind the associated MHD shock front are ≈0.05 ± 0.02 and ≈0.1 ± 0.01, respectively. We calculated the magnetic field B in the above two coronal regions by adopting the empirical relationship between the dcp and B for the harmonic plasma emission and the values are ≈(0.7-1.4) ± 0.2 G and ≈(1.4-2.8) ± 0.1 G, respectively.
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机译:我们报告了与2013年5月2日发生的太阳日冕物质抛射(CME)相关的II型无线电爆发的地面,低频(<100?MHz)无线电成像,光谱和旋光仪观测结果。表示该脉冲串具有基带(F)和谐波(H)发射分量,并具有裂带和人字形结构。在80?MHz处的成像观测结果表明,在太阳大气中,突发的H分量位于径向距离r≈2 R to处靠近CME的前沿。 II型猝发的旋光仪观测结果也是在80MHz上,表明圆极化(dcp)的峰值程度对应于相关MHD激波前沿前后的日冕中产生的发射,其≈0.05±0.02和分别为≈0.1±0.01。我们采用dcp和B之间的经验关系来计算上述两个日冕区域中的磁场B,谐波等离子体发射的值分别为≈(0.7-1.4)±0.2 G和≈(1.4-2.8)±0.1 G , 分别。
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