Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm34a..06s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM34A-06
Physics
2716 Energetic Particles: Precipitating, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2753 Numerical Modeling, 2774 Radiation Belts
Scientific paper
One of the main mechanisms responsible for losses of relativistic electrons from the radiation belts is an interaction between these particles and very-low-frequency electromagnetic waves (whistlers). This fact gives a strong motivation to study generation and propagation of whistlers in the magnetosphere of the earth. One of the main focuses of these studies is a guiding/traping of the whistlers by the magnetic field-aligned channels formed by the enhancement (high-density ducts) or depletion (low-density ducts) of the plasma density. All the previous theoretical studies in this field suggest that the electromagnetic energy can be effectively trapped in the low-density duct but it should leak from the high-density duct and this leakage is particularly strong when the duct is bounded with a sharp gradients in the plasma density. This suggestion means that the high-density ducts are inherently incapable to guide whistlers over a large distance in space. At the same time numerous satellite observations show that in the magnetosphere whistlers are more frequently observed inside the high-density ducts than in the low-density ducts. In this paper we present results from a numerical investigation revealing conditions under which the leakage of the electromagnetic energy from the high-density duct can be essentially equal to zero.
Ganguli Gurudas
Lampe Martin
Manheimer Wallace
Streltsov Anatoly V.
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