Acoustic Power Mapping for Active Regions from MDI, HLH, and TON Data Ladenkov, O. V. ; Hill, F. ; Egamberdiev, Sh. A. ; Chou, D. Y. Abstract Publication: Astronomy Letters Pub Date: June 2002 DOI: 10.1134/1.1484142 Bibcode: 2002AstL...28..411L