Open Access

Properties of dayside nonlinear rising tone chorus emissions at large L observed by GEOTAIL

Earth, Planets and Space200961:BF03352937

Received: 10 September 2007

Accepted: 20 December 2007

Published: 29 May 2009


This paper studies some wave properties of nonlinear rising tone chorus emissions in the outer regions of the dayside equatorial magnetosphere at (6.3,–4.7, 0.7RE) in GSE coordinates. We analyze data obtained with the PWI and WFC receivers on GEOTAIL associated with a substorm on April 29, 1993. Fine structure of the chorus elements and inter-element spacings are shown. Directions of propagation of the chorus elements relative to the local magnetic field lines are analyzed. Wave polarizations, intensities and spectral properties of chorus in the equatorial Earth’s magnetosphere are discussed.

Key words

Chorus emissions wave-particle interactions electron acceleration