  Based on now historical magnetic and plasma data and available wave spectra
from the AMPTE-IRM spacecraft, and on as well historical Equator-S high-cadence
magnetic field observations of mirror modes in the magnetosheath near the
dayside magnetopause, we present some observational evidence for a recent
theoretical evaluation by Noreen et al. (2017) of the contribution of a global
electron temperature anisotropy to the evolution of mirror modes in the
high-temperature anisotropic collisionless plasma of the magnetosheath causing
a separate electron mirror branch. These old data most probably indicate that
signatures of this electron effect on mirror modes had indeed been observed
already long ago in magnetic and wave data though had not been recognised as
such. Unfortunately either poor time resolution or complete lack of plasma data
would have inhibited the confirmation of the notoriously required pressure
balance in the electron branch for unambiguous confirmation of a separate
electron mirror mode. If confirmed by future high-resolution observations, in
both cases the large mirror mode amplitudes suggest that mirror modes escape
quasilinear saturation being in a state of weak kinetic plasma turbulence.
