WHISTLER-MODE CHORUS WAVE-NORMAL DISTRIBUTION
EFFECTS FOR AND ELECTRON SCATTERING IN THE
RADIATION BELTS
Oleksiy Agapitov
LPC2E/CNRS University of Orleans, Orleans, France;
National Taras Shevchenko University of Kiev, Kiev, Ukraine
A. Artemyev
LPC2E/CNRS University of Orleans, Orleans, France;
Space Research Institute,RAS, Moscow, Russia
H. Breuillard, V. Krasnoselskikh
LPC2E/CNRS University of Orleans, Orleans, France;
G. Rolland
CNES, Toulouse, France
Keywords: Cluster measurements, dynamics of the radiation belts.
Abstract: VLF waves play a crucial role in the dynamics of radiation belts, and are responsible for the loss and the
acceleration of energetic electrons. Modeling wave-particle interactions requires the best possible
knowledge of wave energy and wave-normal directions in L-shells for different magnetic latitudes and
magnetic activity conditions. In this work, we performed a statistical study for VLF emissions using a
whistler frequency range for ten years (2001-2010) of Cluster measurements. We performed a statistical
study for VLF emissions using a whistler frequency range for ten years (2001-2010) of Cluster
measurements. We utilized data from the STAFF-SA experiment, which spans the frequency range from 8.8
Hz to 3.56 kHz and present distributions of wave magnetic and electric field amplitude and wave-normals in
dependence on MLat, MLT, L-shell and geomagnetic activity in a form of probability levels, which were
directly applied for electrons diffusion coefficients estimation in the outer radiation belt. The propagation
direction of chorus waves rapidly deflects from the magnetic field with the increase of latitude. The width of
the distribution increases also. Results were proved by use of numerical ray tracing simulation. Distributions
for the diffusion coefficients for day and night sectors and for different geomagnetic activity regimes are
obtained. The diffusion coefficients from these distributions are compared with coefficients calculated under
assumption of whistler parallel propagation with constant value of variance and wave amplitude along
magnetic field line. The increase of the mean value and the variance of the wave vector.
187
Artemyev A., Krasnoselskikh V., Breuillard H., Rolland G. and Agapitov O..
WHISTLER-MODE CHORUS WAVE-NORMAL DISTRIBUTION EFFECTS FOR AND ELECTRON SCATTERING IN THE RADIATION BELT.
DOI: 10.5220/0005415701870187
In Proceedings of the First International Conference on Telecommunications and Remote Sensing (-2012), pages 187-187
ISBN:
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 2012 SCITEPRESS (Science and Technology Publications, Lda.)