Nonstationarity and reformation of high-Mach-number quasiperpendicular shocks: Cluster observations

Details Nonstationarity and reformation of high-Mach-number quasiperpendicular shocks: Cluster observations Nonstationarity and reformation of high-Mach-number quasiperpendicular shocks: Cluster observations

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3405107l&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 5, CiteID L05107

Physics

Geophysics

21

Interplanetary Physics: Planetary Bow Shocks, Interplanetary Physics: Discontinuities (7811), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Nonlinear Geophysics: Critical Phenomena

Scientific paper

A set of experimental data is presented for a high-Mach-number (M f = 5) quasiperpendicular ($\theta$ Bn = 81°) bow shock layer crossed by Cluster spacecraft on 24 January 2001 at 07:05-07:09 UT. The measurements of magnetic field, spectra of electric field fluctuations, and ion distributions reveal that the shock is highly nonstationary. In particular, the magnetic field profiles measured aboard different spacecraft differ considerably from each other. The mean frequency of downshifted waves observed upstream of the shock ramp oscillates with a characteristic time comparable with the proton gyroperiod. In addition, the reflection of ions from the shock is bursty and a characteristic time for this process is also comparable with the ion gyroperiod. All of these features in conjunction are the first convincing experimental evidence in favor of the shock front reformation.

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