Observations of Hα Intensity Oscillations in a Flare Ribbon

Details Observations of Hα Intensity Oscillations in a Flare Ribbon Observations of Hα Intensity Oscillations in a Flare Ribbon

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...620.1101m&link_type=abstract

The Astrophysical Journal, Volume 620, Issue 2, pp. 1101-1106.

Astronomy and Astrophysics

Astronomy

10

Sun: Chromosphere, Sun: Flares, Sun: Magnetic Fields, Sun: Oscillations, Sun: Photosphere

Scientific paper

High-cadence Hα 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.

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