04 Dec 2001; room U1 (please note the change of the date/place for this time)

This time I start with a quick repetition of the last lecture. Then I shall describe our modelling of the phenomenon of HF-induced Langmuir turbulence in the ionosphere, and describe its relation to and difference from the Zakharov model of last time. I shall also introduce another physical mechanism, called "nucleation" by some people (I shall prefer to say "cavitation"), and I shall comment a little on how we treat the numerical aspects. The latter couples to the physical understanding of the model. Finally, I shall show some numerical results, and describe some experiments, and discuss whether cavitation can be/has been detected in these experiments.