The periodic variations of a white-light flare observed with ULTRACAM

Details The periodic variations of a white-light flare observed with ULTRACAM The periodic variations of a white-light flare observed with ULTRACAM

2006-05-08

arxiv.org/abs/astro-ph/0605196v1

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures, accepted for Astronomy Astrophysics

Scientific paper

10.1051/0004-6361:20054752

High time resolution observations of a white--light flare on the active star EQ PegB show evidence of intensity variations with a period of approximately 10 s. The period drifts to longer values during the decay phase of the flare. If the oscillation is interpreted as an impulsively--excited, standing--acoustic wave in a flare loop, the period implies a loop length of 1.7 Mm and 3.4 Mm for the case of the fundamental mode and the second harmonic, respectively. However, the small loop lengths imply a very high modulation depth making the acoustic interpretation unlikely. A more realistic interpretation may be that of a fast--MHD wave, with the modulation of the emission being due to the magnetic field. Alternatively, the variations could be due to a series of reconnection events. The periodic signature may then arise as a result of the lateral separation of individual flare loops or current sheets with oscillatory dynamics (i.e. periodic reconnection).

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