Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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OBSERVATIONS OF EUV RECURRING JETS IN AN ACTIVE REGION CONFINED BY CORONAL LOOPS

  • Zheng, Yan-Fang (National Astronomical Observatories, Yunnan Astronomical Observatory, Chinese Academy of Sciences) ;
  • Wang, Feng (Computer Technology Application Key Lab of Yunnan Province, Kunming University of Science and Technology) ;
  • Ji, Kai Fan (Computer Technology Application Key Lab of Yunnan Province, Kunming University of Science and Technology) ;
  • Deng, Hui (Computer Technology Application Key Lab of Yunnan Province, Kunming University of Science and Technology)
  • Received : 2013.05.14
  • Accepted : 2013.08.12
  • Published : 2013.10.31
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Abstract

Recurring jets, which are jets ejected from the same site, are a peculiar type among various solar jet phenomena. We report such recurring jets ejecting from the same site above an active region on January 22, 2012 with high-resolution multi-wavelength observations from Solar Dynamics Observatory(SDO). We found that the recurring jets had velocities, lengths and lifetimes, but had similar directions. The visible brightening appeared at the jet base before each jet erupted. All the plasma produced by the recurring jets could not overcome the large coronal loops. It seemed that the plasma ejecting from the jet base was confined and guided by preexisting coronal loops, but their directions were not along the paths of the loops. Two of the jets formed crossing structures with the same preexisting filament. We also examined the photospheric magnetic field at the jet base, and observed a visible flux emergence, convergence and cancellation. The four recurring jets all were associated with the impulsive cancellation between two opposite polarities occurring at the jet base during each eruption. In addition, we suggest that the fluxes, flowing out of the active region, might supply the energy for the recurring jets by examining the SDO/Helioseismic and Magnetic Imager (HMI) successive images. The observational results support the magnetic reconnection model of jets.

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References

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