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Microwave diagnostics of magnetic field strengths in solar flaring loops

         

摘要

We have performed microwave diagnostics of the magnetic field strengths in solar flaring loops based on the theory of gyrosynchrotron emission.From Nobeyama Radioheliograph observations of three flare events at 17 and 34 GHz,we obtained the degree of circular polarization and the spectral index of microwave flux density,which were then used to map the magnetic field strengths in post-flare loops.Our results show that the magnetic field strength typically decreases from ~800 G near the loop footpoints to~100 G at a height of 10-25 Mm.Comparison of our results with magnetic field modeling using a flux rope insertion method is also discussed.Our study demonstrates the potential of microwave imaging observations,even at only two frequencies,in diagnosing the coronal magnetic field of flaring regions.

著录项

  • 来源
    《中国科学》 |2021年第1期|P.169-178|共10页
  • 作者单位

    School of Earth and Space Sciences Peking University Beijing 100871 China;

    Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 ChinaSchool of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 100049 China;

    Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 ChinaSchool of Astronomy and Space Science University of Science and Technology of China Hefei 230026 China;

    School of Earth and Space Sciences Peking University Beijing 100871 ChinaKey Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China;

    School of Astronomy and Space Science Nanjing University Nanjing 210023 China;

    Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China;

    Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China;

    School of Earth and Space Sciences Peking University Beijing 100871 China;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 太阳系;
  • 关键词

    solar magnetic field; solar flare; microwave observation; gyrosynchrotron emission;

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