  In this letter we investigate how the complex rotation and quivering motion
of an elongated polarized dust grain in the presence of a monochromatic
electromagnetic wave can originate dipolar emission with two distinct spectral
components. We present a model for the emission of radiation by elongated
polarized dust grains under the influence of both an external electromagnetic
wave and a constant background magnetic field. The dust, exhibiting rotational
motion at the external electromagnetic field frequency w0 as well as quivering
motion at frequency W0, proportional to the em field amplitude, will radiate
with frequencies that will depend on the external field wavelength and
amplitude. The radiated spectra exibits a frequency around w0, and sidebands at
w0+-W0 and w0+-2W0. Since the amplitude and the frequency of the background
electromagnetic field are independent parameters, this model establishes a
correlation between different spectral components of galactic dipolar emission,
which may help to explain the correlation between a component of the Galactic
microwave emission and the 100micons thermal emission from interstellar dust,
that has been recently measured.
