Abstract
We show that umklapp processes naturally explain sign reversals of the quantum Hall effect (QHE) observed in the magnetic-field-induced spin-density-waves (FISDW) phases of organic conductors. Moreover, umklapp scattering can change the polarization of the SDW from linear (sinusoidal SDW) to circular (helicoidal SDW). The QHE vanishes in the helicoidal phases, but a magnetoelectric effect appears.
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