Simultaneous observations of second and sub-second time structures in H
α
, radio and hard X-ray data due to the periodical particle acceleration and MHD waves in the November 1, 2004 flare |
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| Authors: | Huang Guangli Ji Haisheng |
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| Institution: | (1) Purple Mountain Observatory, Nanjing, 210008, China |
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| Abstract: | Second and sub-second structures were simultaneously detected in optical, radio and hard X-ray (HXR) band, respectively by
the GanYu Station of Purple Mountain Observatory, Nobeyama Radio Observatory, and RHESSI satellite in the November 1, 2004 flare (Ji et al., in Astrophys. J. 636:L173, 2006), which may be contributed to the energy transport of the continuous heat flux from the hot corona or chromosphere evaporation
and of the accelerated electrons. The linear correlations between the amplitudes of these fluctuations and their flare emissions,
and those between the cross-correlation coefficients of the fluctuations at two H
α
kernels, or two radio frequencies, or two X-ray energies and their flare emissions may support the causal relationship of
the flare and these time structures. While, the cross-correlations of the fluctuations at three different bands suggest that
the fluctuations are caused by the common thermal or nonthermal processes in the flare. Moreover, some new features of the
fluctuations are reported in the flare: (1) The sub-second fluctuations in radio and HXR bands have a same timescale, which
is evidently larger than that in H-alpha band. The difference may be explained by the downward movements of nonthermal electrons
or the upward motion of chromosphere evaporation. (2) The power-law distributions of the amplitudes of the second and the
sub-second structures are obtained at optical, radio and HXR bands with different indices. (3) The peak-to-peak correspondence
of Stokes I and V components in the sub-second structures at radio band suggests that they may be resulted from a periodical
particle acceleration and particle injection in this event. However, the second structures may be caused by the modulations
of Alfvén waves with an upward speed of 103 km/s. |
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| Keywords: | Solar radio Optical X-ray Flare Fluctuations |
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