Magnetic Field Oscillations in the Martian Magnetosheath and Magnetic Pileup Region

Details Magnetic Field Oscillations in the Martian Magnetosheath and Magnetic Pileup Region Magnetic Field Oscillations in the Martian Magnetosheath and Magnetic Pileup Region

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p21b0369e&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #P21B-0369

Physics

2772 Plasma Waves And Instabilities, 5421 Interactions With Particles And Fields, 5440 Magnetic Fields And Magnetism, 5443 Magnetospheres (2756), 6225 Mars

Scientific paper

Turbulent magnetic oscillations have been detected by the Mars Global Surveyor spacecraft in the region between the Martian bow shock and the magnetic pileup boundary (MPB). Initial analyses of these very low frequency (<10 Hz) waves are presented. We find that these waves show several principal frequencies of oscillation. This indicates that multiple wave modes are present including ion cyclotron waves of various populations. The waves tend to be principally left-hand circularly polarized throughout the magnetosheath (MS) but linearly polarized near the MPB. The direction of the linear polarization relative to the planetary surface evolves throughout the magnetic pileup region. We also find that throughout the MS the amplitude of the waves in the direction parallel to the mean magnetic field tends to be larger than the amplitude of the waves perpendicular to the mean field. However, near the MPB the amplitudes become nearly equal. These parameters indicate that several physical mechanisms may be involved in the production of these waves and further analysis will be required to fully identify each mechanism.

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