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Method of the high-accuracy airborne survey

Modern equipment and techniques of airborne surveys (ABS) enable us to carry out measurements with an error less than 2 - 5 nT. These surveys permit us to map anomalies having an intensity equal 2 - 15 nT, that is, the so-called `thin structure' of the magnetic field. Raising the accuracy of the measurement of a geomagnetic field expands the range or scope of the objectives to be recorded. That poses the problem of the special nontraditional manner of the technique of the survey, the acquisition and the mapping. Of very great importance is detecting and calculating the variations which at high latitudes change very rapidly in space and time. Under these conditions, the direct method of accounting for the variations, requiring the creation of a dense net of variation stations on coast and aquatory, appears to be non- effective and sometimes impossible. Then it is necessary to use the indirect method which is based on a special technique of the survey and its acquisitions.