Study on the annual variation of satellite magnetic anomaly in China

Abstract:

The CHAMP satellite mission is providing reliable measurements from which the global lithospheric magnetic field. Using 7 years (2003~2009) of CHAMP satellite scalar magnetic field data, we derive the annual variation of satellite magnetic anomaly in China. For the satellite data selection, a wide range of geomagnetic index and other data selection filters have been used to best isolate suitably quiet magnetospheric and ionospheric conditions. By further separating the magnetic anomalies from the core and external field components in the satellite data, the result has low noise levels. We study on the annual variation of magnetic anomaly between 2003 and 2007 in China, the maps of annual variation can truly reflect the changing of the distribution of magnetic anomalies in China.