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An extended magnetosphere of a strongly magnetized accreting white dwarf(known as a polar) prevents the formation of an accretion disk and the matteris channelled to the magnetic pole(s). A few such sources show quasi-periodicoscillations in their optical light curves. These high-frequency oscillationsare thought to be generated from the post-shock accretion column. The kineticenergy of the accretion flow is finally emitted from this post-shock region andthe involved radiation processes decide the state of the matter. Here we studythe structure and the dynamical properties of such accretion columns andcompare the results with the observational characteristics.

QPOs from post-shock accretion column of strongly magnetized accreting white dwarfs