ELECTRON ENERGY AND MAGNETIC FIELD DERIVED FROM SOLAR MICROWAVE BURST SPECTRA
ELECTRON ENERGY AND MAGNETIC FIELD DERIVED FROM SOLAR MICROWAVE BURST SPECTRA
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DOI：
10.1088/0004-637x/696/1/274
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发表时间：
2009-05
期刊：
影响因子：
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通讯作者：
Jeongwoo Lee;G. Nita;D. Gary
中科院分区：
文献类型：
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作者：
Jeongwoo Lee;G. Nita;D. Gary
太阳耀斑期间的微波爆发对高能电子和磁场敏感，这两者都是太阳耀斑物理的重要组成部分。本文介绍了欧文斯谷太阳能电池阵测量的412个耀斑的微波爆发的信息。我们假设这些爆发主要是由于回旋同步辐射的非热电子在一个单一的幂律能量分布，使用简化的公式回旋同步辐射的数据分析。第二个主要的假设是，从这个微波数据库中得到的耀斑电子的统计特性应该与早些时候基于太阳峰期使命任务的硬X射线爆发光谱仪的结果一致。磁场信息是以平均磁场与总源面积之间的标度律的形式获得的，其结果是在10400 G附近的窄分布。导出的非热电子能量与峰值通量、峰值频率和谱指数之间的关系，通过多步回归拟合，可用于空间积分微波谱观测非热电子能量的快速估算。
Microwave bursts during solar flares are known to be sensitive to high-energy electrons and magnetic field, both of which are important ingredients of solar flare physics. This paper presents such information derived from the microwave bursts of the 412 flares that were measured with the Owens Valley Solar Array. We assumed that these bursts are predominantly due to gyrosynchrotron radiation by nonthermal electrons in a single power-law energy distribution to use the simplified formulae for gyrosynchrotron radiation in the data analysis. A second major assumption was that statistical properties of flare electrons derived from this microwave database should agree with an earlier result based on the hard X-ray burst spectrometer on Solar Maximum Mission. Magnetic field information was obtained in the form of a scaling law between the average magnetic field and the total source area, which turns out to be a narrow distribution around ∼400 G. The derived nonthermal electron energy is related to the peak flux, peak frequency, and spectral index, through a multistep regression fit, which can be used for a quick estimate for the nonthermal electron energy from spatially integrated microwave spectral observations.