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The relationship between hard X-ray pulse timings and the locations of footpoint sources during solar flares View all abstracts by submitter

Andrew Inglis   Submitted: 2012-01-27 10:56

The cause of quasi-periodic pulsations (QPP) in solar flares remainsthe subject of debate.Recently, Nakariakov & Zimovets (2011) proposed a new model suggestingthat, in two-ribbonflares, such pulsations could be explained by propagating slow waves.These waves may travelobliquely to the magnetic field, reflect in the chromosphere andconstructively interfere at aspatially separate site in the corona, leading to quasi-periodicreconnection events progressingalong the flaring arcade. Such a slow wave regime would have certainobservational characteristics.We search for evidence of this phenomenon during a selection oftwo-ribbon flares observed byRHESSI, SOHO and TRACE; the flares of 2002 November 9, 2005 January 19and 2005 August22. We were not able to observe a clear correlation between hard X-rayfootpoint separationsand pulse timings during these events. Also, the motion of hard X-rayfootpoints is shown to becontinuous within the observational error, whereas a discontinuousmotion might be anticipatedin the slow wave model. Finally, we find that for a preferential slowwave propagation angle of25-28 degrees that is expected for the fastest waves, the velocitiesof the hard X-ray footpointslead to estimated pulse periods and ribbon lengths significantlylarger than the measured values.Hence, for the three events studied, we conclude that theobservational characteristics cannot beeasily explained via the Nakariakov & Zimovets (2011) propagating slowwave model when onlyangles of 25-28 degrees are considered. We provide suggested flareparameters to optimise futurestudies of this kind.

Authors: A. R. Inglis & B. R. Dennis

Publication Status: ApJ (accepted)
Last Modified: 2012-01-27 22:34
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