Ground-Based Auroral Hiss: Wave Direction Finding
Abstract
The auroral hiss emission is generated at altitudes of about 10000 - 25000 km as a result of the Cherenkov radiation of precipitating soft electrons. Electromagnetic waves propagate from the generation region to the ground at frequencies between the lower hybrid resonance frequency and the electron gyro-frequency. Ground-based observations of the auroral hiss are typically accompanied by a visible aurora. The ground-based observations of the auroral hiss at two points, namely Kannuslehto (Finland) and Lovozero (Russia) located at about the same high geomagnetic latitudes and spaced in longitude by ~400 km have been made simultaneously. We proposed and used a new approach to estimate the arrival angles of the auroral hiss observed at the ground. It is shown that the ionospheric exit region of auroral hiss is located southward of the visible aurora. To explain the experimental results, we applied a model of the auroral hiss propagation from the generation region through the ionosphere to the ground. The results of modeling are consistent with the observations.
- Publication:
-
Eleventh Workshop on Solar Influences on the Magnetosphere, Ionosphere and Atmosphere
- Pub Date:
- September 2019
- DOI:
- 10.31401/WS.2019.proc
- Bibcode:
- 2019simi.conf..119N