Search for Electron Precipitation Associated with High Power VLF Transmissions from the DSX Satellite: Results from DSX and POES Observations

The Demonstration and Science Experiments (DSX) satellite mission from June 2019 to May 2021 conducted high-power VLF transmission in the medium Earth orbit (MEO) region. Such transmissions are capable of producing (to a limited degree) precipitation of radiation belt electrons via wave-particle interactions, and could be useful for confirming and improving the theoretical underpinnings of these interactions. DSX carried the Loss Cone Imager High Sensitivity Telescope (LCI-HST) to look for evidence of such precipitation. In addition DSX conducted dozens of transmissions during magnetic field line conjunctions with POES satellites. We report results and constraints from searches for precipitation during these events.