  We derive the effective action for a moving magnetic-field-induced
spin-density wave (FISDW) in quasi-one-dimensional conductors at zero and
nonzero temperatures by taking the functional integral over the electron field.
The effective action consists of the (2+1)D Chern-Simons term and the (1+1)D
chiral anomaly term, both written for a sum of the electromagnetic field and
the chiral field associated with the FISDW phase. The calculated frequency
dependence of Hall conductivity interpolates between the quantum Hall effect at
low frequencies and zero Hall effect at high frequencies, where the counterflow
of FISDW cancels the Hall current. The calculated temperature dependence of the
Hall conductivity is interpreted within the two-fluid picture, by analogy with
the BCS theory of superconductivity.
