caa a22 4500 445345837 CHVBK 20180317142828.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s11207-010-9550-3 doi (NATIONALLICENCE)springer-10.1007/s11207-010-9550-3 Newly Identified Properties of Surface Acoustic Power [Elektronische Daten] [H. Schunker, D. Braun] The cause of enhanced acoustic power surrounding active regions, known as the acoustic halo, is not as yet understood. We explore the properties of the enhanced acoustic power observed near disk center from 21 to 27 January 2002, including AR 9787. We find that i)there exists a strong correlation of the enhanced high-frequency power with magnetic-field inclination, with greater power in more horizontal fields, ii)the frequency of the maximum enhancement increases along with magnetic-field strength, and iii)the oscillations contributing to the halos show modal ridges that are shifted to higher wavenumber at constant frequency in comparison to the ridges of modes in the quiet Sun. Springer Science+Business Media B.V., 2010 Helioseismology, observations nationallicence Active regions, magnetic fields nationallicence Velocity fields, photosphere nationallicence Schunker H. Max Planck Institute for Solar System Research, Max-Planck-Strasse 2, 37191, Katlenburg-Lindau, Germany aut Braun D. Colorado Research Associates Division, NorthWest Research Associates, Inc., 3380 Mitchell Lane, 80301, Boulder, CO, USA aut Solar Physics Springer Netherlands 268/2(2011-02-01), 349-362 0038-0938 268:2<349 2011 268 11207 https://doi.org/10.1007/s11207-010-9550-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-010-9550-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schunker H. Max Planck Institute for Solar System Research, Max-Planck-Strasse 2, 37191, Katlenburg-Lindau, Germany aut NATIONALLICENCE 700 1- Braun D. Colorado Research Associates Division, NorthWest Research Associates, Inc., 3380 Mitchell Lane, 80301, Boulder, CO, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 268/2(2011-02-01), 349-362 0038-0938 268:2<349 2011 268 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer