[P-EM15] Dynamics of Magnetosphere and Ionosphere

[PEM15-21] Diurnal periodicity in Earth’s radio emissions

*Alexandra Ruth Fogg¹, Caitríona M. Jackman¹, Simon J. Walker¹, Matthew J. Rutala¹ (1.School of Cosmic Physics, Dublin Institute for Advanced Studies, DIAS Dunsink Observatory, Dublin D15 XR2R, Ireland)

Keywords:Earth, Space Weather, Radio Emissions, Auroral Kilometric Radiation, Diurnal periodicity, Substorm

Planetary radio emissions have potential as a very valuable remote diagnostic of planetary rotation rates as well as magnetospheric dynamics. Auroral Kilometric Radiation (AKR) is Earth’s strongest natural radio emission, and is anisotropically beamed from a source locked to auroral latitude magnetic field lines. These field lines are tied to the deep interior of the rotating planet, and hence it is theorised that an observer at a fixed local time will observe a diurnal variation in AKR power, as if the Earth and its emission were a lighthouse. In this study we explore this proposed 24 hour periodicity in AKR power using a decade of observations from Wind/WAVES.