Whistler mode waves observed by MGF search coil magnetometer-Polarization and wave normal features of upstream waves near the bow-shock

1994 ◽  
Vol 21 (25) ◽  
pp. 2907-2910 ◽  
Author(s):  
K. Hayashi ◽  
H. Matsui ◽  
H. Kawano ◽  
T. Yamamoto ◽  
S. Kokubun
Keyword(s):  
Bow Shock ◽  
Whistler Mode ◽  
Search Coil ◽  
Whistler Mode Waves ◽  
Wave Normal ◽  
Upstream Waves

scholarly journals Guiding of whistler-mode waves with frequencies above one half of the gyrofrequency in the magnetosphere

1999 ◽  
pp. 11-15
Author(s):  
D.M. Sulic
Keyword(s):  
Ray Tracing ◽  
Initial Position ◽  
Normal Direction ◽  
The Other ◽  
Frequency Range ◽  
Whistler Mode ◽  
Geomagnetic Induction ◽  
Whistler Mode Waves ◽  
Wave Normal

Ray-tracing calculations show that a trough, L = 4.6, located in the region outside the plasmapause is capable to guide whistler-mode waves in frequency range 0.5fBmin?0.64fBmin, from one hemisphere to the other. From an initial position rays propagate in unducted mode up to h ? 14000 km where they are trapped inside the trough. Propagation along the trough is possible only with great shifting of wave normal direction in respect to the direction of the geomagnetic induction B, following the variations of the magnitude of the ambiental geomagnetic induction, or those of ratio f/fB. On leaving the trough rays propagate in unducted mode downward in the magnetosphere.

On the propagation of half-gyrofrequency whistler-mode waves in the magnetospheric plasma

1986 ◽  
Vol 36 (3) ◽  
pp. 379-385 ◽  
Author(s):  
N. Ohmi ◽  
M. Hayakawa
Keyword(s):  
Hot Electrons ◽  
Mode Propagation ◽  
Large Wave ◽  
Whistler Mode ◽  
Hot Plasma ◽  
Two Component ◽  
Component Plasma ◽  
Whistler Mode Waves ◽  
Electron Gyrofrequency ◽  
Wave Normal

The propagation of whistler-mode waves at frequencies above one half the electron gyrofrequency has been investigated for a magnetospheric two-component plasma (cold and lower energy hot electrons) by use of the properties of refractive index surfaces. The presence of hot plasma is found to enhance the tendency towards field-aligned focusing of half-gyrofrequency whistler-mode propagation at large wave normal angles close to the oblique resonance angle of the whistler-mode propagation in the corresponding cold plasma.

scholarly journals Characteristics of the Poynting flux and wave normal vectors of whistler-mode waves observed on THEMIS

2013 ◽  
Vol 118 (4) ◽  
pp. 1461-1471 ◽  
Author(s):  
Wen Li ◽  
J. Bortnik ◽  
R. M. Thorne ◽  
C. M. Cully ◽  
L. Chen ◽  
...  
Keyword(s):  
Whistler Mode ◽  
Poynting Flux ◽  
Whistler Mode Waves ◽  
Normal Vectors ◽  
Wave Normal

scholarly journals Extremely intense whistler mode waves near the bow shock: Geotail observations

1999 ◽  
Vol 104 (A1) ◽  
pp. 449-461 ◽  
Author(s):  
Y. Zhang ◽  
H. Matsumoto ◽  
H. Kojima ◽  
Y. Omura
Keyword(s):  
Bow Shock ◽  
Whistler Mode ◽  
Whistler Mode Waves

Obliquely propagating whistler mode waves in cold plasmas permeated by dilute low-β anisotropic plasmas

1977 ◽  
Vol 18 (1) ◽  
pp. 1-14 ◽  
Author(s):  
K. Hashimoto ◽  
I. Kimura
Keyword(s):  
Growth Rate ◽  
Landau Damping ◽  
Elementary Functions ◽  
Whistler Mode ◽  
Oblique Propagation ◽  
Wide Range ◽  
Analytic Expressions ◽  
Cold Plasmas ◽  
Whistler Mode Waves ◽  
Wave Normal

We analyse the growth rate of obliquely propagating whistler mode waves in a cold plasma that also contains some hot electrons in a bi-Maxwellian distribution. Approximate analytic expressions for the growth rate are derived explicitly. They are represented by elementary functions only, consisting of a Landau damping term and a cyclotron instability term. They are found to be valid for a wide range of wave normal angles. Landau damping in the oblique propagation does not always become larger even if the wave normal angles increase. The necessary conditions for the minimal parallel growth are Ω > 0.5Ωe and T≥> 2T∥ in the bi-Maxwellian hot plasma. This method is applied to calculations of the net growth along the ray paths of obliquely propagating non-ducted whistler mode waves in a model magnetosphere.

scholarly journals Bursts of whistler mode waves in the upstream of the bow shock: Geotail observations

1998 ◽  
Vol 103 (A9) ◽  
pp. 20529-20540 ◽  
Author(s):  
Y. Zhang ◽  
H. Matsumoto ◽  
H. Kojima
Keyword(s):  
Bow Shock ◽  
Whistler Mode ◽  
Whistler Mode Waves

On whistler-mode trapping in the magnetospheric ducts

1984 ◽  
Vol 31 (3) ◽  
pp. 487-493 ◽  
Author(s):  
S. S. Sazhin
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Mode Propagation ◽  
Plasma Model ◽  
Whistler Mode ◽  
Whistler Mode Waves ◽  
Average Wave ◽  
Wave Normal ◽  
Normal Angle ◽  
Simplified Formula

Conditions for whistler-mode trapping in the magnetospheric ducts are considered. The plasma model includes electron temperature and anisotropy, and there are no restrictions on the value of the wave normal angle. It is pointed out that the range of the wave normal angles for which whistler-mode waves can be trapped in the ducts with enhanced electron density increases when the electron temperature and (or) anisotropy increases; the corresponding increase also takes place for the average wave normal angle when whistler-mode waves are trapped in the ducts that have a deficiency in electron density. The limits of applicability of a simplified formula derived by Sazhin & Sazhina, for whistler-mode propagation in a hot anisotropic plasma, are clarified.

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