Roze, Ye. N., Information available from the gradient method of measuring the geomagnetic field, Geomagnetism and Aeronomy, 13, 647-649, 1973.

Abstract

The final result of gradient measurements of the geomagnetic field is an estimate of the derivative of the field in the direction of the line of measurement. In this case it is necessary:

1. to determine the class of geophysical problems that can be solved by the method in question;
2. to estimate the error in te determination of the field derivative from the data of the gradient meter;
3. to investigate the question of the selection of the optimum gardient-meter base.

Let us write the values of the field measured by the first and second sensors of the gradient meter:

T₁ = T_e ( x + Dx, t ) + TB ( x + Dx, t ) + d₁ ( x + Dx, t ),
T₂ = T_e ( x, t ) + TB ( x, t ) + d₂ (x, t ),

where T_e is the geomagnetic field; T_ex is the magetic field produced by external sources; d₁ (x, t ) and d₂ (x, t ) are the errors of the sensors; and Dx is the effective base between the sensors of the gradient meter.

References

1. Sveahnikov, A.A. Prikladnyye metody teorii sluchaynykh protsessov (Applied methods of the theory of random processes). Sudpromgiz, 1963.

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