1960-1985 Sq-seasonal/B-splive SV type magnetic field models FILE FORMAT DESCRIPTION read.me gsfcsqsb.bm UINF uinf.sqsb2xa.Qbmag2:d=1e+03 the damped version, denoted GSFC(SQSB-bm), which minimizes a simple mean-square scalar magnitude of the field over Earth's surface gsfcsqsb.um UINF uinf.sqsb2xa.it1 the undamped version, denoted GSFC(SQSB-un)