Record-breaking Coronal Magnetic Field in Solar Active Region 12673
Record-breaking Coronal Magnetic Field in Solar Active Region 12673
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DOI：
10.3847/2041-8213/ab3042
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
S. Anfinogentov;A. Stupishin;I. Mysh’yakov;G. Fleishman
中科院分区：
文献类型：
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作者：
S. Anfinogentov;A. Stupishin;I. Mysh’yakov;G. Fleishman
太阳上最强的磁场通常是在暗太阳黑子处探测到的。磁场的大小通常约为3000 G，只有少数例外报告磁场超过5000 G。由于磁场在太阳大气层中随高度的增加而减弱，因此从未有超过2000 G的日冕磁场被报道。在这里，我们提出了2017年9月6日在太阳活动区NOAA 12673的日冕底部约4000 G的异常强磁场的成像微波观测。结合光球矢量测量的磁场和日冕探测，我们创建和验证了一个非线性无力场日冕模型，我们量化了创纪录的日冕磁场在不同的日冕高度。
The strongest magnetic fields on the Sun are routinely detected at dark sunspots. The magnitude of the field is typically about 3000 G, with only a few exceptions that reported the magnetic field in excess of 5000 G. Given that the magnetic field decreases with height in the solar atmosphere, no coronal magnetic field above ∼2000 G has ever been reported. Here, we present imaging microwave observations of anomalously strong magnetic field of about 4000 G at the base of the corona in solar active region NOAA 12673 on 2017 September 6. Combining the photospheric vector measurements of the magnetic field and the coronal probing, we created and validated a nonlinear force-free field coronal model, with which we quantify the record-breaking coronal magnetic field at various coronal heights.