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Temperature and Electron Density Diagnostics of a Candle-flame-shaped Flare View all abstracts by submitter

Silvina Guidoni   Submitted: 2015-02-10 08:20

Candle-flame-shaped flares are archetypical structures that provide indirect evidence of magnetic reconnection. A flare resembling Tsuneta's famous 1992 candle-flame flare occurred on 2011 January 28; we present its temperature and electron density diagnostics. This flare was observed with Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA), Hinode/X-Ray Telescope (XRT), and Solar Terrestrial Relations Observatory Ahead (STEREO-A)/Extreme Ultraviolet Imager, resulting in high-resolution, broad temperature coverage, and stereoscopic views of this iconic structure. The high-temperature images reveal a brightening that grows in size to form a tower-like structure at the top of the posteruption flare arcade, a feature that has been observed in other long-duration events. Despite the extensive work on the standard reconnection scenario, there is no complete agreement among models regarding the nature of this high-intensity elongated structure. Electron density maps reveal that reconnected loops that are successively connected at their tops to the tower develop a density asymmetry of about a factor of two between the two legs, giving the appearance of "half-loops." We calculate average temperatures with a new fast differential emission measure (DEM) method that uses SDO/AIA data and analyze the heating and cooling of salient features of the flare. Using STEREO observations, we show that the tower and the half-loop brightenings are not a line-of-sight projection effect of the type studied by Forbes & Acton. This conclusion opens the door for physics-based explanations of these puzzling, recurrent solar flare features, previously attributed to projection effects. We corroborate the results of our DEM analysis by comparing them with temperature analyses from Hinode/XRT.

Authors: S. E. Guidoni, D. E. McKenzie, D. W. Longcope, J. E. Plowman, and K. Yoshimura
Projects: Hinode/XRT,SDO-AIA,STEREO

Publication Status: ApJ, published
Last Modified: 2015-02-11 12:23
Go to main E-Print page  Relationship between EUV microflares and small-scale magnetic fields in the quiet Sun  Magnetic axis safety factor of finite beta spheromaks and transition from spheromaks to toroidal magnetic bubbles  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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