Computer Science
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...1e..36t&link_type=abstract
Cosmic Particle Acceleration, 26th meeting of the IAU, Joint Discussion 1, 16-17 August, 2006, Prague, Czech Republic, JD01, #36
Computer Science
Scientific paper
Introduction: The acceleration procrsses involved in powering large solar events remain enigmatic. We studied the evolution of three two-ribbon flares ( 2000 July 14, 2003 Oct. 28, and Oct. 29) and deduced the evolution of induced electric field. The action of the direct electric field acceleration in three GLE events is discussed Method: By using multi-wavelength data analysis(TRACE, SOHO/MDI, SOHO/ EIT,Yohkoh/HXT, REHSSI/HXT, GOES) , at first, using high cadence(~ 1 minute) 171 Å TRACE observations to measure the ribbon separation of the flares, to enhance the spatial structure especially of the flare ribbons, we apply a high-pass filter, by subtracting a smooth image from the original images. To overlay the positions of the flare ribbons on the active region magnetic field, we first rebin the TRACE WL image to the same pixel size as a close MDI continuum image, and cross-correlate the two images. This procedure returns a value of the offset between the TRACE and MDI images. Then the positions of the flare ribbons for each TRACE 171Å image are traced and overlaid on SOHO/MDI magnetogram. We also reconstruct hard X-ray images overlay them on MDI magnetogram. According to the flare standard model, the separation velocity of couple conjugated footpoints, where are chosen just around the area of the conjugated hard X-ray sources,the magnetic field that the footpoints sweep through and the inferred electric field are obtained. Result: The evolution of induced electric field E of three flares are all temporally correlated with the evolution of hard X-ray (or gammy-ray) and microwave . The maximun E is of ~13V/cm for the 2000 July 14 flare, ~40 V/cm for the 2003 Oct. 28 , and ~40V/cm for Oct. 29. These values are much larger than most of the results previously reported by a number of authors. Discussion: Acoording to Heerikhuisen, Litvinenko & Craig model (2002), the acceleration by reconnection electric field in powering large current sheet probably makes a critical contribution to the acceleration of relativistic particles and the impulsive component of the LGLE events.
Dai Yu
Li Chuan
Tang Yuhua
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