Propagation to the ground at high latitudes of auroral radio noise below the electron gyrofrequency

Details Propagation to the ground at high latitudes of auroral radio noise below the electron gyrofrequency Propagation to the ground at high latitudes of auroral radio noise below the electron gyrofrequency

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10014637h&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A8, p. 14637-14646

Physics

10

Ionosphere: Wave Propagation, Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Auroral Ionosphere, Ionosphere: Plasma Waves And Instabilities

Scientific paper

The propagation of auroral radio noise at frequencies below the ionospheric electron gyrofrequency (fce~1.4 MHz) at high latitudes is investigated using the HOTRAY ray tracing code. Two mechanisms are described whereby energy in this frequency range may access the ground. It is assumed that the radiation is generated by an upgoing loss cone in regions of depleted electron density above the ionosphere according to the theory of Wu et al. (1989). It is demonstrated that since the waves are generated with fpefce in the ionosphere and for a dipole magnetic field, Z mode waves are reflected in the topside ionosphere and do not have access to the ground. However, Z mode waves can access the second radio window where energy can be mode converted into whistler mode waves which do propagate to the ground. Typically, the range of initial wave normal angles is a few degrees and the resulting latitudinal spread of emissions on the ground is a few degrees. This suggests that any emissions observed on the ground should be closely confined in latitude to the generation region. For a density model where fpe

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