’n‹…˜f¯‰ÈŠwêU@’n‹…‰ÈŠwçt‡•”“Á•Êu‰‰‰ï “ú: •½¬25”N5Œ28“úi‰Îj13:00`14:30 êŠF‹“s‘åŠw —ŠwŒ¤‹†‰È1†ŠÙ5ŠK563†º u‰‰‘è–¼F@ Probing Earth's core with satellite magnetic field models u‰‰ÒF@ Seiki Asari (Uni. Potsdam/GFZ, Germany) u‰‰—v|F In the CHAMP satellite mission the Earth's magnetic field was measured densely throughout the whole globe for July 2001-September 2010. The immense amount of vector field data has made it possible to build temporally continuous models of the main field (originating from the core) with an unprecedentedly high accuracy. GRIMM3 (2000-2011) is the latest of such models, which is particularly designed to map the vertical field component down at the core-mantle boundary. Also, the CHAMP data have allowed to refine field models even prior to the mission period. C3FM2 is a main field model for 1957-2008, for which satellite data are supplemented by secular variation data from ground-based observatories to backward estimate the field at earlier epochs. This seminar talk consists of three topics, each expected to take half an hour if fully presented (the talk shall be arranged according to attendee's interests and time allowed). (i) Introduction --- Historical and satellite magnetic observations (ii) Rapid variations --- Subdecadal variations of core field and Earth rotation (iii) Quasi-steady structure --- Imaging toroidal magnetic field at the top of the core The first topic (i) is a review of the history of global geomagnetic field observations and modelling, especially focusing on contributions of German scientists. (ii) and (iii) concern recent works exploring the Earth's core using C3FM2 and GRIMM3, respectively. –â‚¢‡‚킹æF@“¡@_–¾i’n¥‹CƒZƒ“ƒ^[j