Martian magnetic morphology: Contributions from the solar wind and crust

[1] Mars Global Surveyor (MGS) Magnetometer (MAG) data provide constraints on magnetic morphology at Mars, including the relative importance of the solar wind and of crustal magnetic sources. We analyze MAG data to characterize the upstream interplanetary magnetic field (IMF) and confirm trends in the magnetic field expected from the solar wind interaction with a planetary atmosphere, including increases at the shock and magnetic pile-up boundary (MPB), postshock turbulence, and field line draping around the Martian obstacle. Crustal magnetic sources locally modify the solar wind interaction, adding variability to the Martian magnetic environment that depends on planetary rotation. We identify trends in the vector magnetic field with respect to altitude, solar zenith angle, and planetary location. Crustal sources influence the magnetic field to different altitudes above different regions, and the influence of the strongest source extends to 1300–1400 km. The draped IMF partially controls the field topology above crustal sources, and crustal magnetic field lines reconnect to this field in a systematic fashion that depends upon Mars' geography, IMF strength, and IMF orientation.

[1]  M. Acuna The magnetic field of Mars , 2003 .

[2]  D. Mitchell,et al.  Structure of the magnetic field fluxes connected with crustal magnetization and topside ionosphere at Mars , 2002 .

[3]  D. Mitchell,et al.  Probing Mars' crustal magnetic field and ionosphere with the MGS Electron Reflectometer , 2001 .

[4]  J. Arkani‐Hamed A 50‐degree spherical harmonic model of the magnetic field of Mars , 2001 .

[5]  L. Hood,et al.  Mapping and modeling of magnetic anomalies in the northern polar region of Mars , 2001 .

[6]  D. Mitchell,et al.  The global magnetic field of Mars and implications for crustal evolution , 2001 .

[7]  F. Nimmo,et al.  Estimates of Martian crustal thickness from viscous relaxation of topography , 2001 .

[8]  H. Frey,et al.  An altitude‐normalized magnetic map of Mars and its interpretation , 2000 .

[9]  D. Mitchell,et al.  Venus‐like interaction of the solar wind with Mars , 1999 .

[10]  Clinton P. T. Groth,et al.  3D multi‐fluid MHD studies of the solar wind interaction with Mars , 1999 .

[11]  Ness,et al.  Magnetic lineations in the ancient crust of mars , 1999, Science.

[12]  Ness,et al.  Global distribution of crustal magnetization discovered by the mars global surveyor MAG/ER experiment , 1999, Science.

[13]  Ness,et al.  Magnetic Field and Plasma Observations at Mars: Initial Results of the Mars Global Surveyor Mission , 1998, Science.

[14]  S. Brecht Hybrid simulations of the magnetic topology of Mars , 1997 .

[15]  P. Cloutier,et al.  Observations of magnetic structure at the dayside ionopause of Venus , 1995 .

[16]  O. Vaisberg The solar wind interaction with Mars: A review of results from previous soviet missions to Mars , 1992 .

[17]  J. Sauvaud,et al.  Mars Observer magnetic fields investigation , 1992 .

[18]  H. Koskinen,et al.  Plasma composition measurements of the Martian magnetosphere morphology , 1990 .

[19]  Rickard N. Lundin,et al.  Aspera/Phobos measurements of the ion outflow from the MARTIAN ionosphere , 1990 .

[20]  C. Russell,et al.  Martian bow shock: Phobos observations , 1990 .

[21]  N. Ness,et al.  Remanent magnetism at Mars , 1988 .

[22]  J. Spreiter,et al.  A new predictive model for determining solar wind-terrestrial planet interactions , 1980 .

[23]  L. N. Zhuzgov,et al.  The magnetic field of mars according to the data from the Mars 3 and Mars 5 , 1976 .

[24]  O. Vaisberg,et al.  Structure and variations of solar wind-Mars interaction region , 1975 .

[25]  D. Mitchell,et al.  Magnetic field draping around Mars: Mars Global Surveyor results , 2001 .

[26]  K. Szego Present understanding of the dayside mantle regions of Venus and Mars , 2001 .

[27]  David L. Mitchell,et al.  The solar wind interaction with Mars: Locations and shapes of the bow shock and the magnetic pile‐up boundary from the observations of the MAG/ER Experiment onboard Mars Global Surveyor , 2000 .

[28]  D. Mitchell,et al.  Magnetic Field and Plasma Observations at Mars: Initial Results of , 1998 .

[29]  Christopher T. Russell,et al.  The intrinsic magnetic field and solar-wind interaction of Mars , 1992 .

[30]  C. Russell The magnetic field of Mars: Mars 5 evidence re‐examined , 1978 .