Spherical Harmonic Analysis of Short-Term Variability in the External and Induced Geomagnetic Field, with Supermag.

Friday, 19 December 2014
Gareth Dorrian1, James A Wild2, Mervyn P Freeman3, Robert Shore3 and Jesper W Gjerloev4, (1)University of Lancaster, Lancaster, LA1, United Kingdom, (2)University of Lancaster, Lancaster, United Kingdom, (3)British Antarctic Survey, Cambridge, United Kingdom, (4)Johns Hopkins University - Applied Physics Laboratory, Laurel, MD, United States
We present a methodology for developing spherical harmonic models of short-term variations in the external and induced geomagnetic field. The method uses data from the SuperMAG global magnetometer network, which is provided at 1-minute time resolution. We examine some of the technical challenges encountered in the method development and some initial results are discussed. Results are compared with those from a climatological study running in parallel, which also utilizes SuperMAG data.