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Ann. Geophys., 20, 981-996, 2002
www.ann-geophys.net/20/981/2002/
© European Geosciences Union 2002
A first approach to model the low-frequency wave activity in the plasmasphere
R. André1, F. Lefeuvre1, F. Simonet2, and U. S. Inan3
1LPCE/CNRS, 3A Av. de la Recherche Scientifique, 45071 Orléans Cedex, France
2CEA/ DAM Ile-de France, Département de Physique Théorique et Appliquée, BP 12, 91680 Bruyères le Chatel, France
3STAR/Stanford University, USA
Correspondence to: F. Lefeuvre
(lefeuvre@cnrs-orleans.fr)
Abstract. A comprehensive empirical
model of waves is developed in the objective to simulate wave-particle
interactions involved in the loss and acceleration of radiation belt electrons.
Three years of measured magnetic wave field components from the Plasma Wave
Instrument on board the DE-1 satellite are used to model the amplitude spectral
density of the magnetic wave field of each type of emission observed in the
equatorial regions of the plasmasphere: VLF transmitter emissions, chorus
emissions, plasmaspheric hiss emissions and equatorial emissions below ~ 200
Hz. Each model is a function of the wave frequency f , the MLT, L
and Mlat parameters, and the Kp values. The performances of the
plasmaspheric hiss and chorus models are tested on amplitude spectra recorded
on board the OGO-5 and GEOS-1 satellites.
Key words. Magnetospheric physics (plasmasphere;
plasma waves and instabilities; instruments and techniques)
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