  Estimating the temperature of the solar wind particles and their anisotropies
is particularly important for understanding the origin of these deviations from
thermal equilibrium as well as their effects. In the absence of energetic
events the velocity distribution of electrons reveal a dual structure with a
thermal (Maxwellian) core and a suprathermal (Kappa) halo. This paper presents
a detailed observational analysis of these two components, providing
estimations of their temperatures and temperature anisotropies and decoding any
potential interdependence that their properties may indicate. The data set used
in this study includes more than 120$\,$000 the events detected by three
missions in the ecliptic within an extended range of heliocentric distances
from 0.3 to over 4~AU. The anti-correlation found for the core and halo
temperatures is consistent with the radial evolution of the Kappa model,
clarifying an apparent contradiction in previous observational analysis and
providing valuable clues about the temperature of the Kappa-distributed
populations. However, these two components manifest a clear tendency to deviate
from isotropy in the same direction, that seems to confirm the existence of
mechanisms with similar effects on both components, e.g., the solar wind
expansion, or the particle heating by the fluctuations. On the other hand, the
existence of plasma states with anti-correlated anisotropies of the core and
halo populations suggests a dynamic interplay of these components, mediated,
most probably, by the anisotropy-driven instabilities.
