Wave properties of a pore observed by SDO HMI and AIA on 2013 March 11
Tuesday, 2 September 2014
Regency Ballroom (Hyatt Regency)
Su-Chan Bong1,2, Kyung-Suk F Cho1,3, Eun-kyung Lim2, Il-Hyun Cho1,2, Yeon-Han Kim1,4 and Young-deuk Park5, (1)Korea University of Science and Technology, Daejeon, South Korea, (2)KASI Korea Astronomy and Space Science Institute, Daejeon, South Korea, (3)KASI, Daejeon, South Korea, (4)Korea Ast. & Sp. Sci. Ins., Daejeon, South Korea, (5)Korea Astronomy and Space Science Institute, Daejeon, South Korea
Abstract:
We report the wave properties of a pore observed by HMI (Helioseismic and Magnetic Imager) and AIA (Atmospheric Imaging Assembly) onboard SDO (Solar Dynamics Observatory) on 2013 March 11. The pore is about 5 arcsec in diameter and well isolated from the other pores or spots. We calculated the weighted mean values of intensity, line-of-sight magnetic field, and line-of-sight velocity inside the pore as well as the area. We found strong 4.5 min oscillation in the photospheric HMI intensity but could not find prominently enhanced power at the corresponding period in the magnetic field, velocity, and area. In AIA, we could see strong oscillation at 5.5 min period in the low chromospheric 160 nm and 170 nm intensity, and at 2.5 min period in the upper chromospheric 30.4 nm intensity. This is in contrast with the conventional cut-off frequency explanation that interior waves with frequencies higher than the cut-off frequency propagate through the upper atmosphere.
