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Opportunities for High-Power, High-Frequency Transmitters to Advance Ionospheric/Thermospheric Research Report of a Workshop (2014) / Chapter Skim
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2 Mesosphere, Thermosphere, and Ionosphere
Pages 21-28

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Select key terms on the right to highlight them within pages of the chapter.


From page 21...
... . PMSE refers to coherent radar scatter from thin layers in the polar summer mesosphere where charged dust particles and ice crystals associated with polar mesospheric clouds are present.
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From page 22...
... Paul Bernhardt and others at the workshop discussed how ionospheric modification induces enhanced optical emissions via induced electron impact on neutral species that can be used as a diagnostic of background aeronomic processes. Both thermal and suprathermal processes are believed to be at work, with red-line excitation through direct electron heating and green-line excitation through electron acceleration.
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From page 23...
... A workshop participant noted that for all of the methodologies under discussion, knowledge of the ionospheric interaction height is essential for accurate data interpretation. Ionospheric density profiles provided by an incoherent scatter radar (ISR)
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From page 24...
... In this experiment, the heating pump power was ramped upward and then downward, allowing the determination of the threshold pump electric field required for initiation of thermal parametric instability. This threshold is a function of a number of parameters, including the inelastic electron cooling rate in the E region (Dysthe et al., 1983; Hysell et al., 2010)
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From page 25...
... Attributing the signatures to an incident shear wave, a reflected shear wave, and a reflected magnetosonic wave, they were able to infer the Pedersen and Hall conductances at the foot of the flux tube. The authors concluded that this unique experimental capability holds great promise for magnetosphere-ionosphere coupling studies because it has the potential to provide dynamic lower boundary conditions for magnetospheric models in real time.
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From page 26...
... Some participants claim that heaters could also potentially produce propagating responses in the ionosphere-thermosphere system, which could then be used to test sophisticated models of the ionosphere. Three-dimensional models have been used, for example, to describe how a localized disturbance at Arecibo would propagate in terms of ion acoustic waves, thermal pulse, density pulse, and so forth, all the way to the conjugate hemisphere, that could be detected by various instruments, especially ISR, at the conjugate point.
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From page 27...
... 1978. Theory of thermal parametric instability in an inhomogenous plasma.
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From page 28...
... 2011. Dusty space plasma diagnosis using temporal behavior of polar mesospheric summer echoes during active modification.
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Key Terms

  • ionospheric modification
  • plasma density
  • coherent radar
  • workshop participant
  • density irregularities

  • thermal parametric
  • modification experiments
  • heating experiments
  • electron density
  • density profiles

  • polar mesospheric
  • electric fields
  • participant noted
  • neutral density
  • radar scatter

  • neutral species
  • neutral wind
  • neutral winds
  • artificial periodic
  • mesospheric summer

  • ambipolar diffusion
  • parametric instability
  • incoherent scatter
  • summer echoes
  • upper hybrid

  • diffusion rate
  • interaction height
  • quenching rate
  • periodic inhomogeneities
  • using ionospheric


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