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Paper: Active regions: Evolution and Effect on Time-Distance Measurements
Volume: 383, Subsurface and Atmospheric Influences on Solar Activity
Page: 365
Authors: Burtseva, O.; Hill, F.; Kholikov, S.
Abstract: Using SOHO-MDI velocity data, we study the influence of the active region that emerged on the solar surface in October 2003 on travel time measurements. We computed travel time maps for waves with two different phase speeds and investigated the spatial distribution of the travel times. Changes in the spatial power spectrum of the travel times may be useful for detecting an emerging active region.
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