Design and implementation of The VLF wave and particle precipitation mapper sensor suite
- The VLF Wave and Particle precipitation Mapper (VPM) Sensor Suite will serve as a complement to ongoing DoD programs aimed at qualification of controlled precipitation of energetic electron radiation by ELF/VLF whistler-mode waves. Two benefitting programs are the Air Force Demonstration and Science Experiment (DSX) satellite mission, and the High frequency Active Auroral Research Program (HAARP). New capabilities provided by VPM are afforded by a dual detector configuration that provides sensitive measurements of energetic electrons both just-inside and just-outside the bounce loss cone, and by wave receivers with GPS-based timing facilitating interferometric measurements of electron density irregularities. The VPM sensor suite will make use of novel VLF micro-receivers consisting of radiation-hardened (up to a 2 Mrad) Low Noise Amplifier (LNA), Anti-Aliasing Filter (AAF), and Analog-to-Digital Converter (ADC) application specific integrated circuits (ASICs) developed over the past 6 years in the context of three student PhD theses. These devices provide the capability to conduct ELF/VLF observations at extremely low power and weight, while maintaining the high degree of sensitivity, resolution and dynamic range required in such measurements. Research areas of VPM will focus on determining energy spectra, temporal signatures, and spatial extent of energetic electron precipitation bursts induced by discrete whistler-mode waves, launched by ground-based sources: (i) lightning discharges, (ii) VLF transmitter signals (e.g., NPM, NAA, etc.), and (iii) ELF/VLF waves injected by modulated HF heating (i.e., HAARP). VPM will measure waves in broadband fashion so as to identify those from different sources, with high time and frequency resolution. It will simultaneously measure energetic particles with high sensitivity (large geometric factors), high time and energy resolution, so as to assess cause and affect relationships and determine calibrated theoretical models (by determining the flux levels that result from given levels of wave power density). VPM will also measure transmitted VLF wave intensity from the DSX/WIPER transmitter and determine transmitter efficiency, effective plasma sheath impedance and confirm dynamics of transmission process.
|Type of resource
|electronic; electronic resource; remote
|1 online resource.
|Stanford University, Department of Electrical Engineering.
|Gill, John T III
|Gill, John T III
|Statement of responsibility
|Submitted to the Department of Electrical Engineering.
|Thesis (Engineering)--Stanford University, 2015.
- © 2015 by Steven Ingram
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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