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A CME-Producing Solar Eruption from the Interior of an Emerging Bipolar Active RegionIn a negative-polarity coronal hole, magnetic flux emergence, seen by the Solar Dynamics Observatory's {SDO) Helioseismic Magnetic lmager (HMI), begins at approximately 19:00 UT on March 3, 2016. The emerged magnetic field produced sunspots, which NOAA numbered 12514 two days later. The emerging magnetic field is largely bipolar with the opposite-polarity fluxes spreading apart overall, but there is simultaneously some convergence and cancellation of opposite-polarity flux at the polarity inversion line (PIL) inside the emerging bipole. In the first fifteen hours after emergence onset, three obvious eruptions occur, observed in the coronal EUV images from SDO's Atmospheric Imaging Assembly (AIA). The first two erupt from separate segments of the external PIL between the emerging positve-polarity flux and the extant surrounding negative-polarity flux, with the exploding magnetic field being prepared and triggered by flux cancellation at the external PIL. The emerging bipole shows obvious overall left-handed shear and/or twist in its magnetic field. The focus of th is poster is the third and largest eruption, which comes from inside the emerging bipole and blows it open to produce a CME observed by SOHO/LASCO. That eruption is preceded by flux cancellation at the emerging bipole's interior PIL, cancellation that plausibly builds a sheared and twisted flux rope above the interior PIL and finally triggers the blow-out eruption of the flux rope via photospheric-convection•driven slow tether-cutting reconnection of the legs of the sheared core field, low above the interior PIL, as proposed by van Ballegooijen & Martens (1989) and Moore & Roumeliotis (1992). The production of this eruption is a (perhaps rare) counterexample to solar eruptions that result from external collisional shearing between opposite polarities from two distinct emerging and/or emerged bipoles (Chintzoglou et al. 2019).
Document ID
20190026706
Acquisition Source
Marshall Space Flight Center
Document Type
Poster
Authors
Adams, M. L. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Moore, R. L. (Alabama Univ. Huntsville, AL, United States)
Panesar, N. K. (Bay Area Environmental Research Inst. Huntsville, AL, United States)
Falconer, D. A. (Alabama Univ. Huntsville, AL, United States)
Date Acquired
June 26, 2019
Publication Date
June 9, 2019
Subject Category
Space Sciences (General)
Report/Patent Number
MSFC-E-DAA-TN69285
Meeting Information
Meeting: Solar Physics Division of the American Astronomical Society
Location: St. Louis, MO
Country: United States
Start Date: June 9, 2019
End Date: June 13, 2019
Sponsors: American Astronomical Society
Funding Number(s)
CONTRACT_GRANT: NNM11AA01A
CONTRACT_GRANT: NNX17AL21G
Distribution Limits
Public
Copyright
Public Use Permitted.

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