Helioseismology in Space Weather - National Solar Observatory

Emerging Active Regionsq Braun, D. C., Science, 336, 296. “Comment on Detection of Emerging SunspotRegions in Solar Interiorq Ilonidis, S., Zhao J. and Kosovichech, A. “Response to Comment on Detection ofEmerging Sunspot Regions in Solar Interiorü On the origing of the large time difference: “The observed phase-shifts can be causednot only by sound-speed and magnetic-field perturbations or plasma flows, but also by morecomplex effects such as absorption and scattering. There has been also evidence, both fromobservations and simulations, that submerged magnetic regions can modify the acoustic powerabove them”q Braun, D. C., 2012, Solar Physics, tmp 306B “Helioseismic Holography of anArtificial Submerged Sound Speed Perturbation and Implications for the Detection ofPre-emergence Signatures of Active Regions