Measurement of the low energy (sub-100 TeV) astrophysical diffuse flux in IceCube

The IceCube Neutrino Observatory is a cubic kilometer-sized detector located at the geographic South Pole designed to detect neutrinos of astrophysical origin. Since the discovery of the high energy astrophysical diffuse flux, many efforts have been made to extend this observation to lower energies (sub-100 TeV). We discuss the medium energy starting event selection (MESE) designed to search for cascade-events above 1 TeV. We show expected sensitivities to the astrophysical flux assuming we use 10 years of data. We also discuss a novel technique using the enhanced starting track event selection (ESTES). In particular, IceCube recently used ESTES to measure the astrophysical flux between 3 - 550 TeV yielding one of the most precise measurements of the astrophysical flux to-date. We discuss the importance of this new result and the future of low energy astrophysical diffuse flux measurements in IceCube.