FM17p.33 — Limb displacement and brightness seismology

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Aug 10th at 6:00 PM until 6:00 PM

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Author(s): Marcelo Emilio1, Ian Cunnyngham3, Jeff Kuhn3, Leandro Mehret1, Rock Bush2, Isabelle Scholl3

Institution(s): 1. PONTA GROSSA STATE UNIVERSITY, 2. Stanford University, 3. University of Hawaii

The Helioseismic and Magnetic Imager (HMI) abord the Solar Dynamics Observatory (SDO) has been used to obtain the most sensitive spectrally resolved observation of individual p-modes at the extreme solar limb. Such oscillation observations of the limb displacement and brightness for some spatial and temporal regimes are even competitive in signal-to-noise to full-disk doppler measurements of the p-mode spectrum. Limb measurements of 5-min p-modes, while having many similarities to full-disk doppler observations, have significantly different sensitivities to the solar rotation and the 5-min mode solar atmospheric structure. These may provide information about the solar structure which is complementary to full-disk measurements. In this work we present results from Individual spherical harmonic p-modes that were detected around solar limb with amplitudes at the micro-arcsecond level.