Intensity and position of the Martian magnetic dipole, calculated from the observations of the satellite Phobos 2
| Autor: | A. Grafe |
|---|---|
| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 1992 |
| Předmět: |
magnetic field orientation
weak magnetic field planet Elliptic orbit magnetic obliquity martian magnetic dipole semi-finite cylindrical nightside magnetopause magnetopause geometry Magnetosphere 3-d geomagnetosphere model intrinsic magnetic field Astrophysics planetary magnetism hemispherical dayside magnetopause astronomical observations space research mars Physics ad 1989 02 08 Astronomy and Astrophysics Mars Exploration Program Geophysics planetocentric distance 4.554 mm Orbit Dipole 8 february 1989 evening sector Space and Planetary Science magnetic dipole position Physics::Space Physics magnetopause crossing radius mars magnetosphere geometry Magnetopause Satellite magnetic dipole intensity Astrophysics::Earth and Planetary Astrophysics phobos 2 observations Magnetic dipole planetary atmospheres |
| Popis: | 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, 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 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 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 = 4.554·106m) [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 0.7·1012 T m3 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. |
| Databáze: | OpenAIRE |
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