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Center-to-Limb Variation of Solar Microwave Bursts

机译：太阳微波爆发的中心到边缘的变化

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Statistical studies of hard X-ray flares position on the solar disk have shown that the more energetic hard X-rays have a tendency to be more concentrated near the limb rather than at disk center, whereas lower-energy hard X-ray emission seems isotropic. Since the high-frequency radio emission is believed to be produced by the same energetic electron population responsible for the high-energy hard X-rays, we searched the microwave/millimeter emitting bursts for center-to-limb variation in their emission. A total of 499 bursts observed by the radio telescopes in Bern at the frequencies of 3.1, 5.2, 8.4, 11.8, 19.6, 35.0, and 50.0 GHz were analyzed. Simultaneous Hα flares were used for determination of the radio burst position on the solar disk. For each of the 7 frequencies, the peak flux and duration were studied as a function of heliocentric position. For 312 bursts, spectral parameters such as spectral index, peak frequency, and flux at spectral maximum were analyzed. For a subset of 43 bursts with emission at all frequencies, the emission and spectral parameters were analyzed. Center-to-limb variations of the spectral parameters for all bursts were sought. In order to interpret the observational results, we have performed a numerical simulation of gyrosynchrotron spectra. We find that high-frequency events, which are also the more energetic ones, have larger center-to-limb variations in their parameters than do the overall flares. Moreover, this behavior agrees with theoretical predictions.
机译：对太阳圆盘上硬X射线耀斑位置的统计研究表明，能量较高的硬X射线倾向于更集中在肢体附近而不是在盘中心，而能量较低的硬X射线似乎是各向同性的。由于高频无线电发射被认为是由负责高能硬X射线的相同高能电子群体产生的，因此我们搜索了微波/毫米波发射脉冲串，以了解其发射中心到边缘的变化。由伯尔尼的射电望远镜在3.1、5.2、8.4、11.8、19.6、35.0和50.0 GHz的频率下总共观测到499个突发。同时使用Hα耀斑确定太阳盘上的无线电脉冲串位置。对于这7个频率中的每个频率，研究了峰值通量和持续时间与日心位置的关系。对于312个突发，分析了频谱参数，例如频谱指数，峰值频率和频谱最大值处的通量。对于在所有频率下都有发射的43个突发的子集，分析了发射和频谱参数。寻找所有突发的频谱参数的中心到边缘的变化。为了解释观测结果，我们对陀螺回旋加速器光谱进行了数值模拟。我们发现，高频事件也是更活跃的事件，其参数的中心到边缘变化比总耀斑更大。此外，这种行为与理论预测相符。

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  • 来源
    《Solar Physics》 |2002年第1期|177-188|共12页
  • 作者

    Adriana V.R. Silva; Marcelo M. Valente;

  • 作者单位

    CRAAM Universidade Presbiteriana Mackenzie;

    Instituto de Fí sica Universidade de São Paulo;

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  • 正文语种 eng
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