Physics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1271s&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A10, pp. SMP 4-1, CiteID 1271, DOI 10.1029/2001JA007539
Physics
21
Interplanetary Physics: Planetary Bow Shocks, Interplanetary Physics: Energetic Particles, Planetary, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions
Scientific paper
We present a case study of plasma, energetic particle, and magnetic field perturbations seen by Wind in the dawn foreshock on 19 April 1996. A comparison with the results of hybrid simulations confirms model predictions for a diamagnetic cavity flanked by regions of enhanced density and magnetic field strength but filled with a suprathermal ion population. In contrast to previously reported hot flow anomalies, flow velocities within the foreshock cavities are nearly identical to those in the ambient solar wind, ion temperatures do not rise greatly, thermal pressures are only slightly greater than those in the ambient solar wind, and the events do not lie centered upon interplanetary magnetic field (IMF) tangential discontinuities intersecting the bow shock. We attribute the cavities to the diamagnetic effects of ions Fermi accelerated within the foreshock. A review suggests that foreshock cavities are far more common than hot flow anomalies.
Lepping Ronald P.
Lin Runliang
Phan Tai-Duc
Sibeck David G.
Szabo Andras
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