  For maintaining gauge invariance in a magnetic field, the heat current
operator should include the magnetic term. Taking this term into account, we
revised calculations of the Nernst-Ettingshausen effect above the
superconducting transition. We found that the fluctuations of the modulus of
the order parameter do not change the particle-hole asymmetry (PHA) of the
thermomagnetic effects. As in the normal state, the thermomagnetic effects in
the fluctuation region are proportional to the square of PHA and, therefore,
small. Large Nernst effect observed in the high-$T_c$ cuprates requires
vortex-like excitations due to the phase fluctuations, which are beyond the
Gaussian-fluctuation theory.
