Jonah J. Colman
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View article: Simultaneous observations of irregular sporadic E structures using the LWA and a DPS4D
Simultaneous observations of irregular sporadic E structures using the LWA and a DPS4D Open
Multi-instrument studies have recently shed new light on the morphology of sporadic E, especially intense sporadic E. Here we present simultaneous observations of dense sporadic E ( ) structures using the Long Wavelength Array (LWA) radio…
View article: N-dimensional Lomb Scargle Periodogram analysis of traveling ionospheric disturbances using ionosonde data
N-dimensional Lomb Scargle Periodogram analysis of traveling ionospheric disturbances using ionosonde data Open
There is a multitude of wave-like phenomena in Earth’s ionosphere and thermosphere such as acoustic waves, gravity waves, planetary waves, tides, and Traveling Ionospheric Disturbances (TIDs) which are the ionospheric manifestation of atmo…
View article: First principles calculations of air fluorescence efficiencies with comparisons to measurements
First principles calculations of air fluorescence efficiencies with comparisons to measurements Open
The fluorescence efficiencies used in calculating the optical emissions produced by energetic particles and penetrating radiation in air are derived for the most part from the measurements, of Davidson and O'neil, Mitchell and Hartman. The…
View article: Validating and Improving a Realistic Ionospheric Truth Model for Observing System Simulation Experiments of HF Propagation
Validating and Improving a Realistic Ionospheric Truth Model for Observing System Simulation Experiments of HF Propagation Open
The US Air Force Coverage and Analysis Program (AFCAP) experiments 1, 2, and 3 have all been multimillion dollar campaigns to perform detailed Observing System Experiments (OSEs) of the ionosphere. Much of that expense has been dedicated t…
View article: Validating and Improving a Realistic Ionospheric Truth Model for Observing System Simulation Experiments of HF Propagation
Validating and Improving a Realistic Ionospheric Truth Model for Observing System Simulation Experiments of HF Propagation Open
View article: Magnetic field effects on the accuracy of ionospheric mirror models for geolocation
Magnetic field effects on the accuracy of ionospheric mirror models for geolocation Open
The geolocation of an uncooperative HF emitter is based on observations of the azimuth and elevation (angle of arrival; AoA) of its signals as they arrive at a surveillance site, along with a model of the propagation medium. The simplest p…