  Radiation force in Abraham-Lorentz-Dirac equation is revisited for possible
signature of irreversible action in the dynamics. The analysis shows that the
classical electron can dissipate out a certain fraction of field energy that
distinguishes itself from the well known Larmor radiation loss. The thermal
power loss is shown to follow bi-quadratic acceleration functionality, which is
akin to the characteristics of Hawking-Unruh radiation emission from warm
surrounding field of a non-inertial observer. Reversibility in nonstationary
evolution is possible at the expense of power from concerned external field. By
revealing nonlocal mitigation characteristics in nonstationary evolutions, a
measure of dissipative relaxation in the radiative electrodynamics is worked
out to compare the two distinctly different modes of energy losses. The measure
is shown to be applicable uniquely in all scales of externally perturbed
systems undergoing nonstationary dynamics, and is used as a common thread to
explain frictional contributions of phonons and electrons reported for metals
in superconductive phase transitions.
  Key words: Abraham-Lorentz-Dirac equation, radiation force, Hawking-Unruh
radiation, frictional dissipation.
