Vlasov simulations of electron heating by Langmuir turbulence near the critical altitude in the radiation-modified ionosphere

Details Vlasov simulations of electron heating by Langmuir turbulence near the critical altitude in the radiation-modified ionosphere Vlasov simulations of electron heating by Langmuir turbulence near the critical altitude in the radiation-modified ionosphere

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.2461w&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, v. 59, p. 2461-2474.

Physics

14

Scientific paper

One-dimensional Vlasov equations are solved numerically for conditions appropriate to the ionospheric F-region during the initial stages of HF-radiation modification experiments at two altitudes: one at the critical altitude, the other approximately 1.5 km lower. Numerical simulations of wave growth and saturation with self-consistent evolution of particle distributions are run past the point at which a statistically steady state is reached. At the critical altitude the wave turbulence is dominated by coherent collapsing wave packets or `cavitons' and at the lower altitude by a combination of coherent (strong) and incoherent (weak) turbulence. Our results are consistent with the predictions of Hanssen et al. [Journal of Geophysical Research, 97, 12,073 (1992)]. Semi-open boundary conditions, in which a small fraction of the hot electrons generated by interactions with the strong localized caviton fields are replaced by electrons from the cool background distribution, are employed to model a heated region of finite length that is large compared to the simulation domain. The resultant steady-state electron distributions are characterized by power-law tails of hot electrons superposed on an approximately Maxwellian bulk distribution. The Langmuir-wave dissipation spectra are found to be in good agreement with predictions based on linear Landau damping on the nonthermal electron tails.

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