Low Energy Noise Rejection with the Majorana Demonstrator

The \textsc{Majorana Demonstrator} is an array of P-type point contact germanium detectors enclosed in a low-background shield at the Sanford Underground Research Facility. Complementary to its search for the neutrinoless double beta decay of ${}^{76}$Ge are low energy rare event searches for dark matter and solar axions. In the initial run, 10 kg-y of data has been taken over a nearly two-year period. Though its detectors are routinely capable of sub-keV energy thresholds, electronics noise in the array presents a challenge to reliably discriminate physics signals from noise at the lowest energies. In this talk I discuss new noise rejection methods for the \textsc{Demonstrator}, employing maximum likelihood fits of each waveform and wavelet packet decomposition to maximize the detection potential for low energy physics searches.