Abstract
The hemispherical power asymmetry, observed in the CMBR data, hasgenerally been interpreted in terms of the dipole modulation modelfor the temperature fluctuations. Here we point out that this modelleads to several predictions, which can be directly tested in thecurrent data. We suggest tests of the hemispherical power asymmetryboth in real and multipole space. We find a significant signal of thedipole modulation model in WMAP and PLANCK data with our tests.The dipole amplitude and direction also agrees, within errors, with earlierresults based on hemispherical analysis in multipole space.We also find evidence that the effective dipole modulation amplitude increaseswith the multipole l in the range l = 2−64.
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