Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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Dynamic Formation and Associated Heating of a Magnetic Loop on the Sun. II. A Characteristic of an Emerging Magnetic Loop with the Effective Footpoint Heating Source

  • Tetsuya Magara (Department of Astronomy and Space Science, Kyung Hee University) ;
  • Yeonwoo Jang (School of Space Research, Kyung Hee University) ;
  • Donghui Son (School of Space Research, Kyung Hee University)
  • Received : 2023.09.19
  • Accepted : 2023.11.14
  • Published : 2023.12.30
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Abstract

We investigated an emerging magnetic loop dynamically formed on the Sun, which has the effective footpoint heating source that may play a key role in heating a solar atmosphere with free magnetic energy in it. It is suggested that the heating source could be related to local compression of a plasma in the emerging loop by means of Lorentz force, which converts the magnetic energy to the internal energy of the plasma that is used to reaccelerate a decelerated downflow along the loop, eventually generating the source when the kinetic energy of the downflow is thermalized. By analyzing very high-cadense data obtained from a magnetohydrodynamic simulation, we demonstrate how the local compression is activated to trigger the generation of the heating source. This reveals a characteristic of the emerging loop that experiences a dynamic loop-loop interaction, which causes the local compression and makes the plasma gain the internal energy converted from the magnetic energy in the atmosphere. What determines the characteristic that could distinguish an illuminated emerging loop from a nonilluminated one is discussed.

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Acknowledgement

The authors deeply appreciate valuable comments provided by the referee. They wish to thank the Kyung Hee University for general support of this work. This work was financially supported by a research program (NRF-2021R1A2C1010310, PI: T. M.) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology.

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