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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Measurements of Coronal and Chromospheric Magnetic Fields Using Polarization Observations by the Nobeyama Radioheliograph
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Measurements of Coronal and Chromospheric Magnetic Fields Using Polarization Observations by the Nobeyama Radioheliograph

机译：野山电子辐射仪利用极化观测测量日冕和大球磁场

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摘要

Coronal and chromospheric magnetic fields are derived from polarization and spectral observations of the thermal free-free emission using the Nobeyama Radioheliograph (NoRH). In magnetized plasma, the ordinary and extraordinary modes of free-free emission have different optical depths. This creates a circularly polarized component in an atmosphere with a temperature gradient. We observed an active region on 2012 April 13 to derive its coronal and chromospheric magnetic fields. The observed degree of circular polarization was between 0.5% and 1.7%. The radio circular polarization images were compared with ultraviolet images observed by the Atmospheric Imaging Assembly and the photospheric magnetic field observed by the Helioseismic and Magnetic Imager, both on board the Solar Dynamic Observatory. At the edge of the active region, the radio circular polarization was emitted mainly from coronal loops, and the coronal magnetic field was derived to be about 70 G. At the center of the active region, the chromospheric and coronal components cannot be separated. The derived magnetic field is about 20% to 50% of the corresponding photospheric magnetic field, which is an emission-measure-weighted average of the coronal and chromospheric magnetic fields.
机译：日冕和色球磁场是通过使用Nobeyama Radioheliograph（NoRH）进行的热自由发射的极化和光谱观察得出的。在磁化等离子体中，自由自由发射的常规模式和非常规模式具有不同的光学深度。这在具有温度梯度的气氛中产生圆极化分量。我们在2012年4月13日观察到一个活动区域，以导出其日冕和色球磁场。观察到的圆极化度在0.5％至1.7％之间。在太阳动力天文台上，将无线电圆偏振图像与通过大气成像组件观察到的紫外线图像以及通过太阳地震和磁成像仪观察到的光球磁场进行了比较。在活动区域​​的边缘，主要从冕环发射了无线电圆极化，并且得出的冕磁场约为70G。在活动区域​​的中心，色球层和冕状部分无法分离。导出的磁场约为相应光球磁场的20％到50％，这是日冕和色球磁场的发射测量加权平均值。

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