On the Temporal and Spatial Properties of Elementary Bursts |
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| Authors: | Jiong Qiu Haimin Wang |
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| Institution: | (1) Big Bear Solar Observatory, New Jersey Institute of Technology, 40386 N. Shore Ln, Big Bear City, CA, 92314-9672, U.S.A.;(2) Division of Physics, Mathematics, and Astronomy, California Institute of Technology, MS106-38, 1200 E. California Blvd., Pasadena, CA, 91125, U.S.A.;(3) Center for Solar Research, Physics Department, New Jersey Institute of Technology, 323 ML King Blvd., Newark, NJ, 07102-1982, U.S.A.;(4) Present address: Physics Department, Montana State University, Bozeman, MT, 59717-3840 |
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| Abstract: | “Elementary bursts” refer to fine time structures on scales of tens of milli-second to a few seconds in flare radiations.
In this paper, we investigate temporal and spatial properties of elementary bursts by exploiting high-cadence Hα (100 ms)
and hard X-ray (125 – 500 ms) observations of an impulsive flare on March 16, 2000. We find that the time scale of 2 – 3 s
is likely an upper limit of the elementary bursts in this event, at which hard X-ray emissions observed by different instruments
correlate, low energy (≤30 keV) hard X-rays and Hα flux correlate, and Hα emissions at conjugate flare kernels correlate.
From our methods, and also largely limited by instrument resolutions, there is a weak indication of existence of sub-second
structures. With the high-resolution Hα data, we also attempt to explore the spatial structure of “elementary bursts” by determining
the average spatial displacement of Hα peak emission between successive “elementary bursts” defined from hard X-ray light
curves. We find that, at the time scale of 3 s, the smallest spatial scale, as limited by the imaging resolution, is about
0.4″. We discuss these results with respect to mechanisms of fragmented magnetic energy release. |
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