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Intensity and position of the Martian magnetic dipole, calculated from the observations of the satellite Phobos 2

: Grafe, A.


Planetary and Space Science 40 (1992), Nr.5, S.719-30
ISSN: 0032-0633
Fraunhofer HHI ()
astronomical observations; mars; planetary atmospheres; planetary magnetism; space research; magnetic dipole intensity; magnetic dipole position; mars magnetosphere geometry; ad 1989 02 08; hemispherical dayside magnetopause; magnetic obliquity; semi-finite cylindrical nightside magnetopause; magnetopause crossing radius; planetocentric distance; magnetic field orientation; weak magnetic field planet; martian magnetic dipole; phobos 2 observations; intrinsic magnetic field; 3-d geomagnetosphere model; magnetopause geometry; evening sector; 8 february 1989; 4.554 mm

By comparing a model of the magnetosphere of Mars and Phobos 2 observations of the magnetic field, an attempt is made to determine whether the planet has an intrinsic magnetic field. The 3-D geomagnetosphere model of Voigt (1981) is used. This model entails a given magnetopause geometry which is represented on the day side by a hemisphere and on the night side by a semi-finite cylinder with constant radius. Voigt's model is adapted to Martian conditions. For comparison with Phobos 2 observations near Mars in the evening sector data are available only from orbit 3 on 8 February 1989. Assuming that on this magnetopause crossing was about 05:48 U.T. (R=4.554*106 m) the best agreement between the model and observation is provided by a dipole having a magnetic moment of about 0.7*1012 T m3 and a tilt to the equator plane of nearly 20 degrees where its North Pole is directed northwards. This leads to the conclusion that the intrinsic magnetic field of Mars is weak.