Abstract
Coherent power above the photospheric acoustic cut-off frequency (at v ~ 5.3mHz) is known to exist in solar helioseismic observations. The arrival of high quality velocity data with high temporal and spatial resolution from the Helioseismic & Magnetic Imager (HMI) on the Solar Dynamics Observatory (SDO) spacecraft allows the high frequency regime to be explored with greater precision than previously. We analyse mode frequencies, widths, and amplitudes from HMI ring diagrams at high frequencies, and compare them to earlier results.
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