COMPARISON OF THE GLOBAL ANALYTICAL MODELS OF THE MAIN GEOMAGNETIC FIELD WITH THE STRATOSPHERIC BALLOON MAGNETIC DATA

摘要

Three global analytical models of a main geomagneticrnfield constructed by satellite data are used: model IGRF,rnDaily Mean Spherical Harmonic Models (DMSHM),rnand model EMM/2010, and also scalar data ofrngeomagnetic field and its gradients, received inrnstratospheric balloon gradient magnetic surveys atrnaltitudes of ~30 km. At these altitudes the regionalrnmagnetic field is formed from all sources of the Earth'srncrust. It enables to receive along lengthy routes ofrnsurveys the fullest data on regional and longwave-lenghtrnmagnetic anomalies. Model DMSHM is used atrnextracting of magnetic anomalies for elimination of arnsecular variation up to significant value 0,2 nT. Thernmodel can be constructed within the limits of ± 1rnmonths from the moment stratospheric balloon surveysrnwith beneficial day terms with magnetic activity up tornKp <20, that leads to an error of representation of mainrnMFE equal ±5 нТл. It is possible at presence acting forrnthe period of stratospheric balloon magnetic survey ofrnthe satellite, for example, Swarm. On stratosphericrnballoon data it is shown, that model EMM/2010rnunsatisfactorily displays MFE at altitude of 30 km.rnHence, the qualitative model of the constant (main andrnanomaly) magnetic field cannot be constructed onlyrnwith use of satellite and ground data. The improvedrnmodel constant MFE, constructed according to satelliternand stratospheric balloon magnetic surveys, developedrnup to a degree and the order m=n=720, will have arnreliable data about regional crust magnetic field, hence,rnand about deep magnetic structure of the Earth's crust.rnThe use gradient magnetic surveys aboard stratosphericrnballoons allows to find the places alternatingrnapproximately through 3000 km in which there are nornmagnetic anomalies. In these places probably tornsupervise satellite magnetic models for a range ofrnaltitude of 20-40 km, timed to stratospheric balloonrnmagnetic surveys.