Abstract
Abstract Spectral analysis by the maximum entropy method and the global minimum method have been performed of the Phobos-2 Martian tail magnetic field data from 63 circular orbits. Spectral peaks in the modulus (absolute value) of the magnetic field are found for periods from about 90.35 days, 12.14 days, 6.32 days, 4.10 days, 3.10 days, down to 24.16 hours and 18.16 hours. The first two periods (with some higher harmonics) are interpreted as to be caused possibly by solar processes, influencing solar wind magnetic properties. The period of 24.16 hours is interpreted as an indication of a corotating magnetic feature at planet Mars (intrinsic field, magnetic anomaly).
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