Magnetic Flux Cancelation Leading to the Eruption of a Coronal Mass Ejection: Observations from Hinode, SOHO, TRACE, and STEREO

Details Magnetic Flux Cancelation Leading to the Eruption of a Coronal Mass Ejection: Observations from Hinode, SOHO, TRACE, and STEREO Magnetic Flux Cancelation Leading to the Eruption of a Coronal Mass Ejection: Observations from Hinode, SOHO, TRACE, and STEREO

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp23b..05s&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SP23B-05

Physics

7519 Flares, 7524 Magnetic Fields, 7531 Prominence Eruptions

Scientific paper

We study a solar eruption involving ejection of a filament on 2007 May 20, using instruments on Hinode, STEREO, TRACE, and SOHO. We observe the filament in EUV from TRACE and STEREO, and in H-alpha from SOT on Hinode. We also see the eruption in soft X-rays with XRT on Hinode, and in several EUV lines from EIS on Hinode. SOHO/MDI magnetograms show that converging motion between opposite-polarity sunspots in the region result in expansion of large-scale loops overlying the region's primary magnetic neutral line, along which sits filament material prior to its eruption. The source location of an EUV filament's surge-like ejection is a negative-polarity magnetic region that is north of the interacting spots, and patches of magnetic field flow at ~ 0.5 km/s from the positive converging spots into the negative region in the north. Apparently, repeated episodes of flux cancelation occur where the flowing positive flux collides with the northern negative flux, and the source of the EUV filament's ejection is near this cancelation site. Spectroscopic data from EIS are available for a portion of the active region that includes the northern cancelation site, and from these data we obtain bulk-flow velocities, line-broadening turbulent velocities, and densities of plasma in the region. The array of observations is consistent with the pre-eruption sheared-core magnetic arcade being gradually destabilized by evolutionary tether-cutting flux cancelation that was driven by converging photospheric flows.

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