Vlasov simulations of ionospheric heating near upper hybrid resonance

Amir Najmi, Bengt Eliasson, Xi Shao, Gennady Milikh, Konstantinos Papadopoulos

Research output: Contribution to conferencePoster

Abstract

It is well-known that high-frequency (HF) heating of the ionosphere can excite field- aligned density striations (FAS) in the ionospheric plasma. Furthermore, in the neighborhood of various resonances, the pump wave can undergo parametric instabilities to produce a variety of electrostatic and electromagnetic waves. We have used a Vlasov simulation with 1-spatial dimension, 2-velocity dimensions, and 2-components of fields, to study the effects of ionospheric heating when the pump frequency is in the vicinity of the upper hybrid resonance, employing parameters currently available at ionospheric heaters such as HAARP. We have found that by seeding the plasma with a FAS of width ~20% of the simulation domain, ~10% depletion, and by applying a spatially uniform HF dipole pump electric field, the pump wave gives rise to a broad spectrum of density fluctuations as well as to upper hybrid and lower hybrid oscillating electric fields. We also observe collisionless bulk-heating of the electrons that varies non-linearly with the amplitude of the pump field.
Original languageEnglish
Publication statusPublished - 15 Dec 2014
EventAGU Fall Meeting - Moscone Center, San Francisco, United States
Duration: 15 Dec 201419 Dec 2014

Conference

ConferenceAGU Fall Meeting
CountryUnited States
CitySan Francisco
Period15/12/1419/12/14

Keywords

  • high frequency heating
  • ionosphere
  • field-aligned density striations (FAS)
  • Vlasov simulations

Cite this

Najmi, A., Eliasson, B., Shao, X., Milikh, G., & Papadopoulos, K. (2014). Vlasov simulations of ionospheric heating near upper hybrid resonance. Poster session presented at AGU Fall Meeting, San Francisco, United States.