Abstract
The method of acoustic imaging (Chang et al. 1997) is a useful tool in helioseismology. In the earlier studies (Chou et al. 1998; Chen et al. 1998; Braun et al. 1998) it has been used to analyze active regions. This technique is also applicable to the quiet Sun. Here we present the result using acoustic imaging tecnique to study the dissipation and emission of p-modes in quiet Sun. In acoustic imaging, the acoustic signal at a target point and target time is reconstructed by coherently summing the signals measured in an annular region centered at the target point based on the time-distance relation. The signal can be constructed with the inbound time-distance or outbound time-distance curve. The difference between the signals constructed with inbound and outbound time-distance relations provide information of dissipation and emission of p-modes. The acoustic signal can be reconstructed with multiple bounces time-distance curve. The variation of signals constructed with the time-distance curve of successive bounces also provide information of dissipation and emission of p-modes. We use the helioseismic data observed with the Taiwan Oscillation Network (TON). We select very quiet regions to minimize the intereferece of active regions. The data is filtered through narrow band-pass filter centered at 3, 4, 5, and 6 mHz to study the frequency dependency of dissipation and emission of solar p-mode.