Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12..187d&link_type=abstract
Advances in Space Research, Volume 12, Issue 8, p. 187-211.
Physics
1
Scientific paper
The Phobos-2 plasmograms and magnetograms measured on the day side of Mars are used to identify the shock front, transition region and magnetopause crosses in the same way as these boundaries are identified near the Earth's magnetosphere. The Martian magnetic moment Mm=(1.35+/-+/-0.03) 1012Tm3 is estimated from the gas dynamics equations and plasma data. Those of subdivision of the measured field into external and internal origin and the estimated Gauss coefficients of dipole field allow to determine Mm=(1.22+/-0.07) 1012Tm3. The dipole axis is declined to the rotation axis at an angle Θ =12°+/-3° and the north magnetic pole is in the south hemisphere. This agrees with the most reliable values Mm=(1.4+/-0.6) 1012Tm3 and 1.5 1012Tm3, Θ <=15° and the dipole polarity determined earlier from Mars 2,3,5 data.
The energy density of the intrinsic magnetic field Bi2/8π = = 12 10-10 erg, exceeds the energy density of the ions nkTi = 0.9 10-10 erg by 13 times at the altitude 870 km. The magnetic field, but not the ionosphere is the real obstacle to the Solar wind near Mars, when Psw <= 5 10-9 dyn cm-2.
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