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The Triggering Mechanism of Quiet-Region Coronal Jet Eruptions: Flux CancelationCoronal jets are frequent transient features on the Sun, observed in EUV and X-ray emissions. They occur in active regions, quiet Sun and coronal holes, and appear as a bright spire with base brightenings. Recent studies show that many coronal jets are driven by the eruption of a minifilament. Here we investigate the magnetic cause of jet-driving minifilament eruptions. We study ten randomly-found on-disk quiet-region coronal jets using SDO/AIA intensity images and SDO/HMI magnetograms. For all ten events, we track the evolution of photospheric magnetic flux in the jet-base region in EUV images and find that (a) a cool (transition-region temperature) minifilament is present prior to each jet eruption; (b) the pre-eruption minifilament resides above the polarity-inversion line between majority-polarity and minority-polarity magnetic flux patches; (c) the opposite-polarity flux patches converge and cancel with each other; (d) the cancelation between the majority-polarity and minority-polarity flux patches eventually destabilizes the field holding the minifilament to erupt outwards; (e) the envelope of the erupting field barges into ambient oppositely-directed far-reaching field and undergoes external reconnection (interchange reconnection); (f) the external reconnection opens the envelope field and the minifilament field inside, allowing reconnected-heated hot material and cool minifilament material to escape along the far-reaching field, producing the jet spire. In summary, we found that each of our ten jets resulted from a minifilament eruption following flux cancelation at the magnetic neutral line under the pre-eruption minifilament. These observations show that flux cancelation is usually the trigger of quiet-region coronal jet eruptions.
Document ID
20170004881
Acquisition Source
Marshall Space Flight Center
Document Type
Presentation
Authors
Panesar, Navdeep K. (Universities Space Research Association Huntsville, AL, United States)
Sterling, Alphonse C. (NASA Marshall Space Flight Center Huntsville, AL United States)
Moore, Ronald L. (Alabama Univ. Huntsville, AL, United States)
Date Acquired
June 1, 2017
Publication Date
May 30, 2017
Subject Category
Solar Physics
Report/Patent Number
MSFC-E-DAA-TN42596
Meeting Information
Meeting: Hinode-11/IRIS-8 Science Meeting
Location: Seattle, WA
Country: United States
Start Date: May 30, 2017
End Date: June 2, 2017
Sponsors: National Center for Atmospheric Research
Funding Number(s)
CONTRACT_GRANT: NNH15CO48B
CONTRACT_GRANT: NNM11AA01A
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
coronal jet
flux cancelation

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