Intensity and position of the Martian magnetic dipole, calculated from the observations of the satellite Phobos 2
Abstract
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 3D geomagnetosphere model of Voigt (1981, Planet. Space Sci. 29, 1) 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 semifinite 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 three elliptical orbits: orbit 1. orbit 2 and orbit 3. Unfortunately due to the uncontrolled spin of the satellite the orientation errors lor oibits 1 and 2 are too great, therefore the comparison with the observation can only be done with the data from orbit 3 on 8 February 1989. Assuming that on this day the magnetopause crossing was about 05:48 U.T. ( R = 4.554·10 ^{6}m) [Dolginov, 1991, Adv. Space Res. (submitted)] the best agreement between the model and observation is provided by a dipole having a magnetic moment of about 0.7·10 ^{12} T m ^{3} and a tilt to the equator plane of nearly 20° where its North Pole is directed northwards. This leads to the conclusion that the intrinsic magnetic field of Mars is weak.
 Publication:

Planetary and Space Science
 Pub Date:
 May 1992
 DOI:
 10.1016/00320633(92)90013E
 Bibcode:
 1992P&SS...40..719G
 Keywords:

 Magnetic Dipoles;
 Mars Atmosphere;
 Planetary Magnetic Fields;
 Planetary Magnetospheres;
 Satellite Observation;
 Satellite Orbits;
 Elliptical Orbits;
 Magnetopause;
 Planetary Orbits;
 Lunar and Planetary Exploration