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Magnetic Flux Cancellation as the Trigger Mechanism of Solar Coronal Jets
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Author and Affiliation:
McGlasson, Riley A.(MacAlester Coll., Saint Paul, MN, United States)
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)
Abstract: Coronal jets are narrow eruptions in the solar corona, and are often observed in extreme ultraviolet (EUV) and X-Ray images. They occur everywhere on the solar disk: in active regions, quiet regions, and coronal holes (Raouafi et al. 2016). Recent studies indicate that most coronal jets in quiet regions and coronal holes are driven by the eruption of a minifilament (Sterling et al. 2015), and that this eruption follows flux cancellation at the magnetic neutral line under the pre-eruption minifilament (Panesar et al. 2016). We confirm this picture for a large sample of jets in quiet regions and coronal holes using multithermal extreme ultraviolet (EUV) images from the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) and line-of-sight magnetograms from the SDO/Helioseismic and Magnetic Imager (HMI). We report observations of 60 randomly selected jet eruptions. We have analyzed the magnetic cause of these eruptions and measured the base size and the duration of each jet using routines in SolarSoft IDL. By examining the evolutionary changes in the magnetic field before, during, and after jet eruption, we found that each of these jets resulted from minifilament eruption triggered by flux cancellation at the neutral line. In agreement with the above studies, we found our jets to have an average base diameter of 7600 +/- 2700 km and an average jet-growth duration of 9.0 +/- 3.6 minutes. These observations confirm that minifilament eruption is the driver and that magnetic flux cancellation is the primary trigger mechanism for nearly all coronal hole and quiet region coronal jet eruptions.
Publication Date: Dec 11, 2017
Document ID:
(Acquired Dec 14, 2017)
Subject Category: SOLAR PHYSICS
Report/Patent Number: MSFC-E-DAA-TN50053
Document Type: Oral/Visual Presentation
Meeting Information: AGU Fall Meeting; 11-15 Dec. 2017; New Orleans, LA; United States
Meeting Sponsor: American Geophysical Union; Washington, DC, United States
Contract/Grant/Task Num: NNH15CO48B; NNM11AA01A; NSF AGS-1460767
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL, United States
National Science Foundation; Arlington, VA, United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Portions of the document may include copyright protected material
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Last Modified: December 14, 2017
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