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On the Temporal and Spatial Properties of Elementary Bursts

Qiu, Jiong and Wang, Haimin (2006) On the Temporal and Spatial Properties of Elementary Bursts. Solar Physics, 236 (2). pp. 293-311. ISSN 0038-0938. doi:10.1007/s11207-006-0050-4.

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“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.

Item Type:Article
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Wang, Haimin0000-0002-5233-565X
Additional Information:© 2006 Springer Science + Business Media, Inc. Received 17 August 2005; Accepted 08 May 2006. We are grateful to the BBSO staff and Yohkoh team for the data support. This work is supported by NASA grants NNG0-4GG21G and NNG0-6GA37G and NSF grant ATM-0603789.
Funding AgencyGrant Number
Subject Keywords:Current Sheet; Light Curve; Solar Phys; Light Curf; Magnetic Reconnection
Issue or Number:2
Record Number:CaltechAUTHORS:20200106-124440191
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Official Citation:Qiu, J. & Wang, H. Sol Phys (2006) 236: 293.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100530
Deposited By: Tony Diaz
Deposited On:08 Jan 2020 20:07
Last Modified:16 Nov 2021 17:54

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