Evidence of the self-reformation of the quasi-perpendicular terrestrial shock front from CLUSTER data

Details Evidence of the self-reformation of the quasi-perpendicular terrestrial shock front from CLUSTER data Evidence of the self-reformation of the quasi-perpendicular terrestrial shock front from CLUSTER data

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51a1618m&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51A-1618

Other

2154 Planetary Bow Shocks, 2784 Solar Wind/Magnetosphere Interactions, 7846 Plasma Energization, 7851 Shock Waves (4455), 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Several mechanisms issued from simulation and theoretical studies are proposed to account for the nonstationarity of quasiperpendicular supercritical shocks. One process -the so-called self-reformation - driven by the accumulation of reflected ions at a foot distance from the ramp has been intensively analyzed with simulations. Present results based on experimental CLUSTER mission clearly evidence signatures of this self-reformation process for the terrestrial bow shock. The study based on magnetic field measurements includes two parts: (i) a detailed analysis of two typical shock crossings for almost perpendicular shock directions where the risk of pollution by other nonstationarity mechanisms is minimum. A special attention is drawn on non appropriate treatment of data which could lead to wrong data interpretation. One key signature of this self-reformation is that the ramp width can reach a very narrow value covering a few electron inertial lengths only; (ii) a statistical analysis based on 24 crossings made by CLUSTER (i.e. 96 shock crossings by individual satellites) evidences the signatures of this nonstationarity versus different plasma conditions and shock regimes. Present results are compared with previous works.

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