Observations of H alpha intensity oscillations in a flare ribbon

Francis Keenan, Shaun Bloomfield, Michail Mathioudakis, R.T.J. McAteer, A. Katsiyannis, P.T. Gallagher, D.S. Brown, R. Moore, D.R. Williams

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

High-cadence Halpha blue wing observations of a C9.6 solar flare obtained at Big Bear Solar Observatory using the Rapid Dual Imager are presented. Wavelet and time-distance methods were used to study oscillatory power along the ribbon, finding periods of 40 - 80 s during the impulsive phase of the flare. A parametric study found statistically significant intensity oscillations with amplitudes of 3% of the peak flare amplitude, periods of 69 s (14.5 mHz) and oscillation decay times of 500 s. These measured properties are consistent with the existence of flare-induced acoustic waves within the overlying loops.
Original languageEnglish
Pages (from-to)1101-1106
Number of pages6
JournalAstrophysical Journal
Volume620
Publication statusPublished - 2005

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