The HOTRAY code was developed at the British Antarctic Survey by Richard Horne
(Reference) and is
designed to carry out ray tracing in a hot, collisionless, magnetised plasma.
It has been applied to waves in the Earth's ionosphere and magnetosphere, as well as the
magnetosphere of Jupiter and laboratory type plasmas.
The code has 4 features which set it apart from other lesser codes ! It includes :
The code can calculate the path integrated growth or decay of waves as they propagate through the plasma for
an unstable particle distribution which may consist of a temperature anisotropy, loss cone, ring or beam
distribution. The code is limited to :
- Propagation in a hot or cold plasma.
- Electrostatic and electromagnetic waves.
- Multiple ion species.
- Unstable electron and ion distribution functions.
The program has been used sucessfully to investigate :
- Linear instabilities.
- WKB approximation - (e.g., wavelengths small compared to spatial gradients).
- Non-relativistic effects.
- Waves at HF in the ionosphere.
- Electromagnetic ion cyclotron waves, (Earth's magnetosphere and Jupiter)
- Whistler mode waves, e.g., whistlers, plasmaspheric hiss and auroral hiss.
- Z mode waves, in the auroral region and at the plasmapause.
- Magnetosonic waves in the equatorial region.
- Electrostatic Bernstein waves at geostationary orbit.
- Lower Hybrid waves in the auroral region.