Absorption emission of solar p-modes: Michelson Doppler Interferometer SOHO observations

We search for sources and sinks of solar p-mode waves by creating absorptio n maps from Dopplergrams taken by the Michelson Doppler Interferometer inst rument on board SOHO. Although the maps are noisy, we present evidence for sources and sinks, of duration similar to 0.5-1 hour or less, based on an a utocorrelation analysis of maps made from sequential intervals of data. Emi ssion and absorption nearly balance each other in the data. This may imply that emission and absorption are inverse processes of each other rather tha n fundamentally different in nature.