Long term determination of variations in energetic electron precipitation into the atmosphere using AARDDVARK

Energetic electron precipitation can be monitored by their affect on the propagation of very low frequency (VLF) radio waves. EEP induced ionization produces changes in received amplitude and phase of the VLF waves as they propagate through the Earth-ionosphere waveguide. The Antarctic-Arctic Radiation-belt Dynamic Deposition VLF Atmospheric Research Konsortia (AARDDVARK) network of receivers (http://www.physics.otago.ac.nz/space/AARDDVARK_homepage.htm) observes VLF radio signals from highpower narrow-band communication transmitters from multiple nations with the goal of understanding and detecting EEP along many different paths. In this presentation we will focus on a near-continuous 8-year database of AARDDVARK ionospheric observations and extract EEP flux magnitudes.