2009-03-07T12:33:34.000Z http://sot.lmsal.com Ted Tarbell LMSAL http://lmsal.com 3251 Hanover Rd, O/ADBS, B/252, Palo Alto, CA, 94304 +1-650-424-2400 tarbell@lmsal.com Hinode SOT Sterling 101 101 null Synoptic Synoptic DC, SYN Sun Center 19 0 0 0 0 2009-03-07T15:59:00.000Z 2009-03-07T16:04:35.000Z 0 0 Synoptic Synoptic BFI NFI (revised: small, no mask) The solar polar regions play a critical role in the solar dynamo and activity cycle. Magnetic field of active regions is transported by meridional flows from low latitudes to the polar regions. This flux transport causes reversals of the global magnetic field of the Sun around the time of activity maxima. The amount of magnetic flux accumulated in the polar regions determines the strength of the future sunspot cycle. For understanding the mechanism of the cyclic magnetic activity it is very important to measure the properties of the meridional flows and supergranular dynamics in the high-latitude regions, and their variations during the solar cycle. XRT joins the campaign for detection of waves propagating into corona.