Physics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..373s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, March 1991, p. 373-376.
Physics
74
Interplanetary Magnetic Fields, Mach Number, Magnetic Field Configurations, Planetary Waves, Shock Waves, High Resolution, Low Frequencies, Particle Motion
Scientific paper
Collisionless shocks at quasi-parallel geometries, i.e., for which the average magnetic field direction upstream of the shock is close to the shock normal, reveal temporally varying quantities, a variety of boundary crossing and kinetic signatures, and magnetic structures, often convecting, of finite extent. These results can be put together by a framework in which the shock can be viewed as an extended region containing three-dimensional Short Large Amplitude Magnetic Structures (SLAMS) which represent individual semi-cycles of the ambient upstream low frequency waves associated with diffuse ions in the ULF fore-shocks. As SLAMS convect with the flow they grow to large amplitudes and entrain inter-SLAMS regions to form an inhomogeneous downstream state. Their finite transverse extent is probably related to, and interacts with, ion beams, to produce a patchy transition zone which accounts for the variety of spacecraft signatures observed.
Burgess David
Schwartz Steven J.
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