Simulations of ELF radiation generated by heating the high-latitude D region

Details Simulations of ELF radiation generated by heating the high-latitude D region Simulations of ELF radiation generated by heating the high-latitude D region

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.4319r&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A3, p. 4319-4328

Physics

2

Ionosphere: Active Experiments, Ionosphere: Auroral Ionosphere, Ionosphere: Electric Fields, Electromagnetics: Wave Propagation

Scientific paper

Three-dimensional simulations show the ELF (extremely low frequency) radiation generated by heating the high-latitude D region and modulating the polar electrojet. The simulations use a time-varying current perturbation in the D region. The ELF radiation is calculated in the Earth-ionospheric waveguide to a radial distance of 2400 km. The angular and radial dependence and the polarization of the horizontal, ground-level magnetic field are determined. The radiation pattern is a combination of a linear dipole antenna and a right-hand circular antenna. At ELF frequencies because of low D region absorption the dipole is dominant. The polarization and field strength in the near-field can predict the orientation of the radiation pattern and the wave amplitude in the far-field. The near-field polarization indicates the direction and strength of the electrojet. As the electromagnetic wave propagates in the waveguide, it drives whistlers waves into the D region. Because of reflection from the D region the mode inside the waveguide is not purely transverse. This gives a counterclockwise rotation to the polarization. Directly above the heated region, waves are also launched along the Earth's magnetic field. The near-field polarization shows good agreement with observations from the high-power auroral stimulation array (HIPAS) and Tromsø.

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