MAGNETIC ANOMALY FIELDS DETERMINED FROM GRADIENT MEASUREMENTS AT STRATOSPHERIC ALTITUDES AND FROM MAGSAT SATELLITE DATA

The magnetic anomaly fields (MAF) obtained from the data of gradient m agnetic measurements at stratospheric altitudes along transcontinental routes, passing over the Russian territory, and from the Magsat satel lite data are investigated. The stratospheric gradient measurements ar e shown to be more suitable for separating and interpreting regional m agnetic anomalies of crustal sources as compared to the data obtained at aircraft and satellite altitudes. It is also shown that, at stratos pheric altitudes, one should use the device for magnetic field measure ments that contains three sensors spread uniformly along the vertical line within four kilometers. This allows us to obtain the rate of MAF change in the stratospheric layer, which makes it possible to study in more detail the geometry of sources and to estimate with high precisi on (about 1 km) the locations of positive and negative zones of the fi rst (and second) vertical derivatives of MAF. In general, the stratosp heric gradient surveys successfully supplement satellite ones.