Author:
Katoh Yuto,Omura Yoshiharu
Abstract
Abstract
We study frequency variation of a coherent whistler-mode wave in a homogeneous magnetic field by a selfconsistent simulation model. Simulation results show that an injected whistler-mode wave packet grows due to an instability driven by temperature anisotropy and the amplified wave packet triggers emissions with frequency shift during its propagation. We clarify that the resonant currents J
E and J
B due to the nonlinear wave-particle interaction play significant roles in both wave growth and frequency variation. Based on the simulation results, we show that the range of the frequency shift in a homogeneous system is quantitatively estimated by the trapping frequency V
T of trapped electrons; in a case that the original frequency of the wave packet is 0.62Ωe and V
T=4.05 × 10−2
c, the lower and upper frequencies are estimated to be 0.565Ωe and 0.685Ωe, respectively. The results of the present study reveal that the role of nonlinear trapping is significant in the elementary process of VLF triggered emissions in the equatorial region of the magnetosphere.
Publisher
Springer Science and Business Media LLC
Subject
Space and Planetary Science,Geology
Reference21 articles.
1. Bujarbarua, S., M. Nambu, B. J. Saikia, M. Eda, and J. I. Sakai, Numerical simulation and theory of generation of electromagnetic waves in the presence of whistler turbulence, Phys. Plasmas, 5(6), 2244–2251, 1998.
2. Buneman, O., TRISTAN, Computer Space Plasma Physics: Simulation Techniques and Softwares, edited by H. Matsumoto and Y. Omura, pp. 67–84, Terra Scientific Publishing Company, Tokyo, Japan, 1993.
3. Hashimoto, K., H. Matsumoto, Y. Serizawa, and I. Kimura, Computer simulation of whistler mode wave-particle interactions using a freeboundary encounter model, J. Geophys. Res., 88, 3072–3078, 1
4. Helliwell, R. A., Controlled stimulation of VLF emissions from Siple station, Antarctica, Radio Sci., 18, 801–814, 1983.
5. Helliwell, R. A. and J. P. Katsufrakis, VLF wave injection into the magnetosphere from Siple station, Antarctica, J. Geophys. Res., 79, 2511–2518, 1974.
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