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We report multi-wavelength power spectra of diffuse Galactic dust emissionfrom BLAST observations at 250, 350, and 500 microns in Galactic Plane fieldsin Cygnus X and Aquila. These submillimeter power spectra statisticallyquantify the self-similar structure observable over a broad range of scales andcan be used to assess the cirrus noise which limits the detection of faintpoint sources. The advent of submillimeter surveys with the Herschel SpaceObservatory makes the wavelength dependence a matter of interest. We show thatthe observed relative amplitudes of the power spectra can be related through aspectral energy distribution (SED). Fitting a simple modified black body tothis SED, we find the dust temperature in Cygnus X to be 19.9 +/- 1.3 K and inthe Aquila region 16.9 +/- 0.7 K. Our empirical estimates provide important newinsight into the substantial cirrus noise that will be encountered inforthcoming observations.

BLAST05: Power Spectra of Bright Galactic Cirrus at Submillimeter Wavelengths