Specific Features of Radiation Transfer in the Hydrogen Lyman-alpha Line and Their Possible Relationship with Changes in the Electron Concentration in the Ionospheric D Region

Abstract

The effect of neutral atmospheric parameters on the radiation transfer in the Lyman-alpha line and the electron concentration in the ionospheric D region is studied for various seasons and nitric oxide (NО) concentrations. The radiation transfer was calculated with a modified radiation transfer model that allows multiscattering radiation effects. The atomic hydrogen and molecular oxygen profiles affecting Lyman-alpha radiation propagation were given with the MSIS-00 model. It is shown the radiation fluxes in the Lyman-alpha line and the electron concentration in the D region can be markedly affected upon sudden stratospheric warming and by the influence of planetary waves on the mesosphere. The changes in radiation fluxes in the Lyman-alpha line under unstable atmospheric conditions in the winter and the possible NО variations qualitatively explain the phenomenon of the winter anomaly.

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Correspondence to S. V. Dyshlevsky or Yu. E. Belikov.

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Dyshlevsky, S.V., Belikov, Y.E. Specific Features of Radiation Transfer in the Hydrogen Lyman-alpha Line and Their Possible Relationship with Changes in the Electron Concentration in the Ionospheric D Region. Geomagn. Aeron. 60, 325–334 (2020). https://doi.org/10.1134/S0016793220030056

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Keywords:

  • mathematical modeling
  • radiation transfer
  • Lyman-alpha line
  • ionospheric D region
  • winter anomaly