Four primary plasma instability processes have been proposed in the literature to explain the generation of phase scintillation associated with polar-cap plasma patches. These are the Gradient Drift, Current Convective and Kelvin-Helmholtz instabilities and a small-scale “Turbulence” process. In this paper the range of possible values of the linear growth-rates for each of these processes is explored using Dynamics Explorer 2 satellite observations. It is found that the inertial Turbulence instability is the dominant process, followed by inertial Gradient Drift, collisional Turbulence and collisional shortwave Current Convective instabilities. The other processes, such as Kelvin-Helmhotz, collisional Gradient Drift and inertial shortwave Current Convective instabilities very rarely (<1% of the time) give rise to a growth rate exceeding 1/60, that is deemed to be significant (in publications) to give rise to GPS scintillation.
- Department of Electronic & Electrical Engineering - Professor
- Doctoral College - Academic Director
- Centre for Space, Atmospheric and Oceanic Science
- EPSRC Centre for Doctoral Training in Statistical Applied Mathematics (SAMBa)
- UKRI CDT in Accountable, Responsible and Transparent AI
- Centre for Autonomous Robotics (CENTAUR)
Person: Research & Teaching