Earth Planets Space, Vol. 61 (No. 5), pp. 625-628, 2009LETTER
Olga P. Verkhoglyadova1,2, Bruce T. Tsurutani3, Y. Omura2, and S. Yagitani4
1University of California, Riverside, USA
2RISH, Kyoto University, Uji, Kyoto, Japan
3Jet Propulsion Laboratory, CalTech, Pasadena, USA
4Kanazawa University, Kanazawa, Japan
(Received September 10, 2007; Revised November 11, 2007; Accepted December 20, 2007; Online published May 29, 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.