Optical Observations of Flare-Induced Oscillations

Details Optical Observations of Flare-Induced Oscillations Optical Observations of Flare-Induced Oscillations

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.9806m&link_type=abstract

American Astronomical Society Meeting 204, #98.06; Bulletin of the American Astronomical Society, Vol. 36, p.985

Astronomy and Astrophysics

Astronomy

Scientific paper

We present high-cadence H alpha blue wing observations of a C9.6 solar flare. Oscillations (period 40-80s) are shown to be present in the post-flare section of lightcurves from a short-lived flare ribbon. Wavelet analysis is used to show the excellent agreement of oscillatory power at 52.4s with a distance-time plot along one half of the ribbon. A best-fit of an oscillation to the curve shows oscillatory amplitude ˜ 0.03% flare ampltiude, period ˜ 69s and decay time ˜ 500s. These parameters are in good agreement with the formation of a second harmonic acoustic wave. A study of loop lengths along the ribbon also agrees with the presence of a ˜ 50s period
JMA is funded by a NRC Research Associateship. Observations were carried out via a Leverhulme Trust Fellowship.

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