In this section
@article{Schwartz:2021:10.1002/essoar.10506367.1,
author = {Schwartz, SJ and Ergun, RE and Harald, K and Wilson, LB and Chen, L-J and Goodrich, KA and Turner, DL and Gingell, I and Madanian, H and Gershman, DJ and Strangeway, RJ},
doi = {10.1002/essoar.10506367.1},
title = {Evaluating the de Hoffmann-Teller cross-shock potential at real collisionless shocks},
url = {http://dx.doi.org/10.1002/essoar.10506367.1},
year = {2021}
}
TY - JOUR
AB - <jats:p>Shock waves are common in the heliosphere and beyond. The collisionlessnature of most astrophysical plasmas allows for the energy processed byshocks to be partitioned amongst particle sub-populations andelectromagnetic fields via physical mechanisms that are not wellunderstood. The electrostatic potential across such shocks is framedependent. In a frame where the incident bulk velocity is parallel tothe magnetic field, the deHoffmann-Teller frame, the potential is linkeddirectly to the ambipolar electric field established by the electronpressure gradient. Thus measuring and understanding this potentialsolves the electron partition problem, and gives insight into othercompeting shock processes. Integrating measured electric fields is spaceis problematic since the measurements can have offsets that change withplasma conditions. The offsets, once integrated, can be as large orlarger than the shock potential. Here we exploit the high-quality fieldand plasma measurements from NASA's Magnetospheric Multiscale mission toattempt this calculation. We investigate recent adaptations of thedeHoffmann-Teller frame transformation to include time variability, andconclude that in practise these face difficulties inherent in the 3Dtime-dependent nature of real shocks by comparison to 1D simulations.Potential estimates based on electron fluid and kinetic analyses providethe most robust measures of the deHoffmann-Teller potential, but withsome care direct integration of the electric fields can be made toagree. These results suggest that it will be difficult to independentlyassess the role of other processes, such as scattering by shockturbulence, in accounting for the electron heating.</jats:p>
AU - Schwartz,SJ
AU - Ergun,RE
AU - Harald,K
AU - Wilson,LB
AU - Chen,L-J
AU - Goodrich,KA
AU - Turner,DL
AU - Gingell,I
AU - Madanian,H
AU - Gershman,DJ
AU - Strangeway,RJ
DO - 10.1002/essoar.10506367.1
PY - 2021///
TI - Evaluating the de Hoffmann-Teller cross-shock potential at real collisionless shocks
UR - http://dx.doi.org/10.1002/essoar.10506367.1
UR - https://doi.org/10.1002/essoar.10506367.1
ER -