supported by the National Natural Science Foundation of China(41304022,41174026,41104047);the National 973 Foundation(61322201,2013CB733303);the Key laboratory Foundation of Geo-space Environment and Geodesy of the Ministry of Education(13-01-08);the Youth Innovation Foundation of High Resolution Earth Observation(GFZX04060103-5-12)
Downward continuation is a key step in processing airborne geomagnetic data. However,downward continuation is a typically ill-posed problem because its computation is unstable; thus, regularization methods are needed ...