Enhanced p-Mode Absorption seen near the Sunspot Umbral-Penumbral Boundary

Details Enhanced p-Mode Absorption seen near the Sunspot Umbral-Penumbral Boundary Enhanced p-Mode Absorption seen near the Sunspot Umbral-Penumbral Boundary

2008-06-17

arxiv.org/abs/0806.2700v1

2008SoPh..251..515M

Astronomy and Astrophysics

Astrophysics

9 pages, 4 figures, Accepted for publication in Solar Physics

Scientific paper

10.1007/s11207-008-9246-0

We investigate p-mode absorption in a sunspot using SOHO/MDI high-resolution Doppler images. The Doppler power computed from a three and a half hour data set is used for studying the absorption in a sunspot. The result shows an enhancement in absorption near the umbral-penumbral boundary of the sunspot. We attempt to relate the observed absorption with the magnetic field structure of the sunspot. The transverse component of the potential field is computed using the observed SOHO/MDI line-of-sight magnetograms. A comparison of the power map and the computed potential field shows enhanced absorption near the umbral-penumbral boundary where the computed transverse field strength is higher.

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