[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)

キーワード：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.