PHOBOS events as precursors of solar wind-dust interaction

Details PHOBOS events as precursors of solar wind-dust interaction PHOBOS events as precursors of solar wind-dust interaction

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..165s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 3, p. 165-168.

Physics

6

Magnetic Disturbances, Mars (Planet), Phobos, Planetary Magnetic Fields, Solar Wind, Spacecraft Orbits, Elliptical Orbits, Ion Acoustic Waves, Magnetohydrodynamic Flow, Polarization (Waves), Standing Waves, Mars, Satellites, Phobos, Solar Wind, Dust, Interaction, Perturbations, Phobos 2 Mission, Spacecraft Observations, Magnetic Field, Models, Waves, Position (Location), Simulations, Charged Particles, Fgmm Instrument, Parameters, Plasma

Scientific paper

Significant magnetic field perturbations in the solar wind were observed during the Phobos-2 elliptical orbits around Mars when the spacecraft crossed the Phobos orbit. As remarkable feature, these so-called Phobos events were detected in all cases only on the upstream side of the Phobos orbit. A simple 1D fluid model is developed which shows that a thin charged dust cloud with an extension of no more than 100 km is able to produce phase-standing, right-hand polarized precursor waves with a spatial periodicity of about the proton skin length. This is the same type of upstream waves which is generated by oblique, subcritical shocks. The measured period of the magnetic variations may be explained as Doppler shift owing to the spacecraft motion through the standing wave structure. The fluid results are confirmed by hybrid code simulations. In conclusion, we suggest the Phobos events to be precursor waves resulting from the interaction of the solar wind with charged dust rings along the Phobos orbit.

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