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Jiong Qiu   Submitted: 2010-12-01 12:47

We conduct a semi-quantitative analysis of two-ribbon flares to investigate the observational relationship between magnetic reconnection and energetics by revisiting the Bastille-day flare, particularly the UV and hard X-ray (HXR) observations. The analysis establishes that prominent UV emission is primarily produced by precipitating electrons that also produce HXRs. In addition, reconnection and subsequent energy release along adjacent field lines along the polarity inversion line (PIL) combined with elongated decay of UV emission may account for the observed extended UV ribbons whereas HXR sources with rapid decay appear mostly as compact kernels. Observations also show that HXR sources and UV brightenings exhibit an organized parallel motion along the magnetic PIL during the rise of the flare, and then the perpendicular expansion of UV ribbons dominate during the peak. With a 2.5 dimensional approximation with the assumed translational dimension along the PIL, we derive geometric properties of UV ribbons and infer the pattern of reconnection as with a varying magnetic guide field during reconnection. It is shown that HXR and UV emissions evolve in a similar way to reconnection rates determined by the perpendicular ''motion.'' The analysis suggests that a relatively strong guide field may be present during the rise of the flare, whereas particle acceleration and non-thermal energy release are probably more efficient with an enhanced reconnection rate with a relatively weak guide field. We discuss the role of the guide field in reconnection and particle energization, as well as novel observational experiments that may be conducted to shed new light on these issues.

Authors: Jiong Qiu, WenJuan Liu, Nicholas Hill and Maria Kazachenko
Projects: None

Publication Status: ApJ, 725, 319
Last Modified: 2010-12-01 12:55
Go to main E-Print page  Chromospheric Jet and Growing ''Loop'' Observed by Hinode: New Evidence of Fan-Spine Magnetic Topology Resulting From Flux Emergence  RHESSI Line and Continuum Observations of Super-hot Flare Plasma  Edit Entry  Download Preprint  Delete Entry 

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