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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 1, pp. 215-225

Studying the deep structure of the Earth's crust by geomagnetic fields and their gradients at stratospheric altitudes

Yu.P. Tsvetkov1 , S.V. Filippov1 
1 Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, Moscow, Troitsk, Russia
Lithosphere magnetic field of the Earth and its vertical gradients at altitudes of the stratosphere are considered. The problem of the interior structure of the Earth's crust retrieval from magnetic stratospheric data is analyzed. It can be reliably solved based on remote sensing of the anomaly lithosphere magnetic field of the Earth, received at two altitudes - 500 and 30 km. The idea of stratospheric balloon gradient magnetic surveys in the stratosphere on a lengthy (6 km) measuring base is considered. A technique for stratospheric balloon gradient magnetic measurements and instruments for this purpose are created. Results of stratospheric balloon gradients magnetic surveys conducted at altitudes of about 30 km are analyzed. It is proved, that on the measuring 6 km base gradients of the fields of magnetic sources located close to the sole of the Earth’s crust are reliably measured. A new method is substantiated to correct global analytical models of the main geomagnetic field during extraction of magnetic anomalies from surveys at lengthy routes. The process of formation of satellite magnetic anomaly (H=400 km) from magnetic anomalies received aboard a balloon (H=30 km) is shown. We conclude that the model of the main geomagnetic field developed up to 720 spherical harmonics should be build based on satellite and stratospheric balloon gradient magnetic data. Such model will carry reliable information on the lithosphere magnetic field, and hence the deep magnetic structure of the Earth's crust.
Keywords: gradient geomagnetic surveys, lithosphere magnetic field of the Earth, global analytical models of themagnetic field of the Earth, stratospheric balloons
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