Computer Science
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8528909r&link_type=abstract
Unknown
Computer Science
Helios 1, Magnetohydrodynamic Waves, Shock Wave Propagation, Solar Wind, Landau Damping, Rankine-Hugoniot Relation, Shock Wave Profiles
Scientific paper
A slow-forward shock-type discontinuity observed by Helios-1 on day 147, 1980, at 0.31 AU, is analyzed employing high resolution plasma and magnetic field measurements. It is shown that this event is not an MHD discontinuity, as the total pressure balance is violated and as the entropy increases across this structure even after inclusion of the alpha-particles. The Hada-Kennel relations Ti/Te 1 and beta 1 are satisfied upstream of this event even after inclusion of the alpha-particles, indicating that steepening of MHD slow waves dominates Landau damping. The Rankine-Hugoniot relations are fulfilled to an absolute difference of 0.00001 by employing any possible combination of an up with a downstream time-averaged data set. The MHD evolutionary conditions are satisfied for any solution to the jump conditions. The shock speed, the amplitudes and relative amplitudes associated with this event are absolutely comparable to those derived for fast-mode shock waves within 1 AU. It is shown that this event is an almost quasi-perpendicular slow-forward MHD shock wave.
Neubauer Fritz Manfred
Ptitsyna N. G.
Richter Arne K.
Rosenbauer Helmut
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