impact of realistic plasma conditions on characteristic scales/amplitudes of macroscopic fields of quasi-perpendicular supercritical shock front.
Abstract
The ramp/foot of a collisionless shock front are well known to play a key role in the formation of energetic particles during their interaction with the nonstationary front of a supercritical quasi-perpendicular shock. Different results obtained from different simulation codes (in particular from PIC and hybrid) converge progressively towards a unified view in the dynamics of the shock front itself. However, most simulations are based on compromise in the use on realistic/nonrealistic plasma parameters (in PIC codes) or on simplifying assumptions and scalings (in Hybrid codes). The features of the shock front of a quasi-perpendicular supercritical shock are analyzed in details with the help of 1D PIC simulations via a parametric study approaching realistic conditions mainly in terms of the ratio wpe/wce, and of Vthe. Approaching real wpe/wce ratio values represents the most difficult task because of computational constraints and the need for strongly optimizing the PIC code. In particular, the present goal of the study is to analyze for different plasma conditions the variability of (i) the spatial scaling of the shock front microstructures, (ii) the overshoot amplitude features, (iii) the features of the shock front self reformation and (iv) the cross shock electric field / potential (CSP) amplitude within the ramp which plays a crucial role (and is sometimes source of controversy when comparing with experimental data) in dissipation processes within the shock transition region and in particles acceleration. The impact on the energy partition between both electrons and ions is analyzed in details in order to extract informations which can be compared with experimental data. Present results will be also compared with previous numerical works.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFMSH21A2506L
- Keywords:
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- 7829 Kinetic waves and instabilities;
- SPACE PLASMA PHYSICSDE: 7845 Particle acceleration;
- SPACE PLASMA PHYSICSDE: 7851 Shock waves;
- SPACE PLASMA PHYSICSDE: 7867 Wave/particle interactions;
- SPACE PLASMA PHYSICS