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Based on now historical magnetic and plasma data and available wave spectrafrom the AMPTE-IRM spacecraft, and on as well historical Equator-S high-cadencemagnetic field observations of mirror modes in the magnetosheath near thedayside magnetopause, we present some observational evidence for a recenttheoretical evaluation by Noreen et al. (2017) of the contribution of a globalelectron temperature anisotropy to the evolution of mirror modes in thehigh-temperature anisotropic collisionless plasma of the magnetosheath causinga separate electron mirror branch. These old data most probably indicate thatsignatures of this electron effect on mirror modes had indeed been observedalready long ago in magnetic and wave data though had not been recognised assuch. Unfortunately either poor time resolution or complete lack of plasma datawould have inhibited the confirmation of the notoriously required pressurebalance in the electron branch for unambiguous confirmation of a separateelectron mirror mode. If confirmed by future high-resolution observations, inboth cases the large mirror mode amplitudes suggest that mirror modes escapequasilinear saturation being in a state of weak kinetic plasma turbulence.

Electron mirror branch: Observational evidence from "historical" AMPTE-IRM and Equator-S measurements