Abstract | Between 13th and 16th January 2005, active region 10720 was the site of several large flares, one of which induced a solar quake. The expanding wave front of the quake was visible across the surface, causing both horizontal and vertical plasma displacements. Using a new scanning technique for ring diagram analysis of SOHO/MDI dopplergrams, we have calculated the horizontal velocity flows within the active region and the surrounding areas to a depth of around 20Mm. From that, we have estimated the radial profile of plasma inflows (or outflows) into the layers under the active region during this period, as a result of the quake. |
