VARIATIONS OF SOLAR SUBSURFACE WEATHER IN THE VICINITY OF ACTIVE REGIONS

摘要

Local-domain helioseismic studies have revealed global-scalernflows beneath the solar surface. These flows of solarrnsubsurface weather (SSW) are complex and exhibit richrntime dependence. Maps of SSW made with ring analy-sisrnreveal large-scale patterns of converging and divergingrnflows, as well as large jets and circulation patterns. Previ-ousrnstudies have observed these phenomena in the vicin-ityrnof active regions, but questions remain regarding cor-relationsrnbetween flow patterns and active region charac-teristics.rnMost active regions show converging flows nearrnthe surface but exhibit greater variation at depth. Somernof the active regions are marked by inflows at all depths,rnsome possess surface inflows and deeper outflows, andrnsome show strong jets. Such flow variations among dif-ferentrnactive regions are quite striking. We have begunrna systematic statistical study of SSW flows around activernregions observed during MDI dynamics observing pro-gramsrnfrom 1996 to 2003. In this progress report, wernshow initial results from flows studied at three depthsrn(1, 7 and 14 Mm beneath the surface) and discuss thernmorphologies of the associated active regions.