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Observations of Enhanced EUV Continua During An X-class Solar Flare Using SDO/EVE View all abstracts by submitter

Ryan Milligan   Submitted: 2012-01-25 03:19

Observations of extreme-ultraviolet (EUV) emission from an X-classsolar flare that occurred on2011 February 15 at 01:44 UT are presented, obtained using the EUVVariability Experiment (EVE)onboard the Solar Dynamics Observatory. The complete EVE spectralrange covers the free-boundcontinua of H I (Lyman continuum), He I, and He II, with recombinationedges at 91.2, 50.4, and22.8 nm, respectively. By fitting the wavelength ranges blue-ward ofeach recombination edge with anexponential function, lightcurves of each of the integrated continuawere generated over the course ofthe flare, as well as emission from the free-free continuum(6.5-3 7nm). The He II 30.4 nm and Lyman- α 121.6 nm lines, and soft X-ray (0.1-0.8 nm) emission from GOES are also included for comparison. Eachfree-bound continuum was found to have a rapid rise phase at the flareonset similar to that seenin the 25-50 keV lightcurves from RHESSI, suggesting that they wereformed by recombination withfree electrons in the chromosphere. However, the free-free emissionexhibited a slower rise phase seenalso in the soft X-ray emission from GOES, implying a predominantlycoronal origin. By integratingover the entire flare the total energy emitted via each process wasdetermined. We find that the flareenergy in the EVE spectral range amounts to at most a few per cent ofthe total flare energy, butEVE gives us a first comprehensive look at these diagnosticallyimportant continuum components.

Authors: Ryan O. Milligan, Phillip C. Chamberlin, Hugh S. Hudson, Thomas N. Woods, Mihalis Mathioudakis, Lyndsay Fletcher, Adam F. Kowalski, Francis P. Keenan
Projects: RHESSI,SDO-EVE

Publication Status: ApJL (Accepted)
Last Modified: 2012-01-25 08:42
Go to main E-Print page  The relationship between hard X-ray pulse timings and the locations of footpoint sources during solar flares  Solar Particle Acceleration at Reconnecting 3D Null Points   Edit Entry  Download Preprint  Delete Entry 

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