scholarly journals The Poynting vector applied to the complex refractive index in a hot plasma near the electron cyclotron frequency and to the cyclotron resonance observed on topside ionograms

Radio Science ◽  
2006 ◽  
Vol 41 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
D. B. Muldrew
Keyword(s):  
Refractive Index ◽  
Cyclotron Resonance ◽  
Poynting Vector ◽  
Cyclotron Frequency ◽  
Complex Refractive Index ◽  
Electron Cyclotron ◽  
Electron Cyclotron Frequency ◽  
Hot Plasma

New electromagnetic hot plasma waves around electron cyclotron harmonics

1986 ◽  
Vol 36 (3) ◽  
pp. 465-471 ◽  
Author(s):  
Kyoko Matsuda
Keyword(s):  
Plasma Density ◽  
Cyclotron Frequency ◽  
Plasma Waves ◽  
Electron Cyclotron ◽  
Circularly Polarized ◽  
Electron Cyclotron Frequency ◽  
Hot Plasma ◽  
Parallel Propagation ◽  
Cyclotron Harmonics ◽  
Strongly Damped

Several branches of strongly damped electromagnetic hot plasma modes have been found around the first two harmonics of the electron cyclotron frequency. They are right circularly polarized in parallel propagation, and their frequency mismatches and damping rates are linearly proportional to their parallel wavenumber, and almost independent of the plasma density when the density is sufficiently high. Details of the modes are presented.

scholarly journals Radial variation of whistler-mode chorus: first results from the STAFF/DWP instrument on board the Double Star TC-1 spacecraft

2005 ◽  
Vol 23 (8) ◽  
pp. 2937-2942 ◽  
Author(s):  
O. Santolík ◽  
E. Macúšová ◽  
K. H. Yearby ◽  
N. Cornilleau-Wehrlin ◽  
H. StC. K. Alleyne
Keyword(s):  
Cyclotron Frequency ◽  
Power Spectra ◽  
Double Star ◽  
Electron Cyclotron ◽  
Radial Variation ◽  
Whistler Mode ◽  
Electron Cyclotron Frequency ◽  
The Earth ◽  
First Results ◽  
Initial Results

Abstract. We use the first measurements of the STAFF/DWP instrument on the Double Star TC-1 spacecraft to investigate whistler-mode chorus. We present initial results of a systematic study on radial variation of dawn chorus. The chorus events show an increased intensity at L parameter above 6. This is important for the possible explanation of intensifications of chorus, which were previously observed closer to the Earth at higher latitudes. Our results also indicate that the upper band of chorus at frequencies above one-half of the electron cyclotron frequency disappears for L above 8. The lower band of chorus is observed at frequencies below 0.4 of the electron cyclotron frequency up to L of 11-12. The maxima of the chorus power spectra are found at slightly lower frequencies compared to previous studies. We do not observe any distinct evolution of the position of the chorus frequency band as a function of L. More data of the TC-1 spacecraft are needed to verify these initial results and to increase the MLT coverage.

Electromagnetic cyclotron-loss-cone instability associated with weakly relativistic electrons

1982 ◽  
Vol 28 (3) ◽  
pp. 503-525 ◽  
Author(s):  
H. K. Wong ◽  
C. S. Wu ◽  
F. J. Ke ◽  
R. S. Schneider ◽  
L. F. Ziebell
Keyword(s):  
Cyclotron Frequency ◽  
Maximum Growth ◽  
Basic Mechanism ◽  
Electron Cyclotron ◽  
Relativistic Electrons ◽  
Electron Component ◽  
Loss Cone ◽  
Electron Cyclotron Frequency ◽  
Cone Type ◽  
Consistent Manner

The amplification of fast extraordinary mode waves with frequencies very close to the electron cyclotron frequency is investigated for a plasma which consists of a weakly relativistic electron component with a loss-cone type distribution and a cold background electron component. The basic mechanism of the amplification is attributed to a relativistic cyclotron resonance between the wave and the energetic electrons. The method employed in the present analysis enables us to solve the dispersion relation in a self-consistent manner for arbitrary ratio of the densities of the energetic and background electrons. It is found that the maximum growth rates occur at certain values of ω2pe/Ω2e and the angular dependence of the growth rate is sensitive to the ratios ω2pe/Ω2e and ne/nb. Here ωpe and Ωe are the electron plasma frequency and the electron cyclotron frequency, respectively, and ne and nb denote the number densities of the energetic and background electrons, respectively.

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