SXT and EIT Observations of A Quiet Region Large-Scale Eruption: Implications for Eruption Theories

Details SXT and EIT Observations of A Quiet Region Large-Scale Eruption: Implications for Eruption Theories SXT and EIT Observations of A Quiet Region Large-Scale Eruption: Implications for Eruption Theories

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..165s&link_type=abstract

Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc

Physics

Scientific paper

We present Yohkoh/SXT and SOHO/EIT observations of a set of slow, large scale, quiet-region solar eruptions. In SXT data, these events seem to appear ``out of nothing,'' indicating that they are associated initially with weak magnetic fields and corresponding low heating rates. These events evolve relatively slowly, affording us an opportunity to examine in detail their development. We look for signatures of the start of the eruptions through intensity variations, physical motions, and dimming signatures in the SXT and EIT data. In particular, we look to see whether the earliest signatures are brightenings occurring in the ``core'' region (i.e., the location where the magnetic shear is strongest and the post-flare loops develop); such early brightenings in the core could be indicative of a ``tether-cutting'' process, whereby the eruption is instigated by magnetic reconnection among highly-sheared core fields. In our best-observed case, we find motions of the core fields beginning well before brightenings in the core. This is new evidence that tether-cutting is not the primary mechanism operating in solar eruptions. Rather, our observations are more consistent with the eruption process known as the ``breakout model'' (Antiochos et al. 1999), which holds that the eruption results from initial slow magnetic reconnections occurring high above (far from) the core region.

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