A NOVEL IONOSPHERIC CYCLOTRON RESONANCE PHENOMENON OBSERVED ON ALOUETTE I DATA

1966 ◽  
Vol 44 (5) ◽  
pp. 925-939 ◽  
Author(s):  
D. B. Muldrew ◽  
E. L. Hagg
Keyword(s):  
Magnetic Field ◽  
Time Delay ◽  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Extraordinary Wave ◽  
Resonance Phenomenon ◽  
Resonant Region ◽  
Electron Gyrofrequency ◽  
Wave Trace ◽  
Good Agreement

Characteristics of an extraordinary wave trace recently identified on Alouette I topside ionograms, and called the remote resonance trace by Hagg (1966), are discussed in detail. From the observations it has been deduced that the radio energy associated with the production of this trace propagates along an ionospheric magnetic field-aligned wave guide. The electric field of an h.f. wave propagating along such a guide would have a gradient normal to the earth's magnetic field, and because of this gradient the wave could excite an electron–cyclotron resonance in a region of the ionosphere that includes the height where the wave frequency is equal to twice the electron gyrofrequency. At some time delay after the wave has passed through the resonant region, the resonating electrons generate an extraordinary wave, which propagates upward along the guide and is subsequently received by the satellite. This wave is responsible for the production of the remote resonance trace. The equation for the time delay is given and the resonance trace computed, using this equation, is shown to be in good agreement with the observed resonance trace for a specific ionogram.

Generalized Electron Cyclotron Resonance in Weakly Ionized Time-Varying Magnetoplasmas

1969 ◽  
Vol 24 (4) ◽  
pp. 555-559 ◽  
Author(s):  
Wolfgang Stiller ◽  
Günter Vojta
Keyword(s):  
Magnetic Field ◽  
Distribution Function ◽  
Cyclotron Resonance ◽  
Electron Distribution ◽  
Electron Cyclotron Resonance ◽  
Electron Distribution Function ◽  
Resonance Phenomenon ◽  
Alternating Electric Field ◽  
Special Cases ◽  
Weakly Ionized

Abstract The electron distribution function is calculated explicitly for a weakly ionized plasma under the action of an alternating electric field E = {0 , 0 , Eoz cos ω t} and a circularly polarized magnetic field BR = Bc{cos ωB t, sin ωB t, 0} rotating perpendicular to the a.c. field. Furthermore, a constant magnetic field B0 = {0, 0, B0} is taken into account. The isotropic part f0 of the electron distribution function which contains, in special cases, well-known standard distributions (distributions of Druyvensteyn, Davydov, Margenau, Allis, Fain, Gurevic) shows a resonance behaviour if the frequencies ω, ωc = (q/m) Bc , ω0 = (q/m) B0 , and ωB satisfy the relation ω= This can be understood as a generalized cyclotron resonance phenomenon.

Dependence of the a-Si:H Defect Density of States on the Magnetic Field Profile of an Electron Cyclotron Resonance Microwave Plasma

1992 ◽  
Vol 258 ◽  
Author(s):  
F.S. Pool ◽  
J.M. Essick ◽  
Y.H. Shing ◽  
R.T. Mather
Keyword(s):  
Magnetic Field ◽  
Density Of States ◽  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Microwave Plasma ◽  
Defect Density ◽  
Electron Cyclotron ◽  
Field Profile ◽  
Magnetic Field Profile ◽  
The Magnetic Field

ABSTRACTThe magnetic field profile of an electron cyclotron resonance (ECR) microwave plasma was systematically altered to determine subsequent effects on a-Si:H film quality. Films of a-Si:H were deposited at pressures of 0.7 mTorr and 5 mTorr with a H2/SiH4 ratio of approximately three. The mobility gap density of states ND, deposition rate and light to dark conductivity were determined for the a-Si:H films. This data was correlated to the magnetic field profile of the plasma, which was characterized by Langmuir probe measurements of the ion current density. By variation of the magnetic field profile ND could be altered by more than an order of magnitude, from 1×1016 to 1×1017 at 0.7 mTorr and 1×1016 to 5×1017 at 5 mTorr. Two deposition regimes were found to occur for the conditions of this study. Highly divergent magnetic fields resulted in poor quality a-Si:H, while for magnetic field profiles defining a more highly confined plasma, the a-Si:H was of device quality and relatively independent of the magnetic field configuration.

Experimental Study of a Plasma Produced by a Helical Radio-frequency Structure

1974 ◽  
Vol 52 (22) ◽  
pp. 2246-2249 ◽  
Author(s):  
H. W. H. Van Andel ◽  
M. T. Churchland ◽  
G. Calabrese
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Field Strength ◽  
Electron Temperature ◽  
Magnetic Field Strength ◽  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Plasma Stability ◽  
Absorption Process ◽  
Moderate Power

A plasma produced by a helical RF structure of the Lisitano type is investigated. Measurements of electron density, electron temperature, and plasma stability are reported as a function of RF frequency and power, magnetic field strength and geometry, and neutral argon pressure. It is concluded that at moderate power (~20 W), electron cyclotron resonance is important in the power absorption process.

Design of a small electron cyclotron resonance ion source with partially pulsed magnetic field

2000 ◽  
Vol 71 (2) ◽  
pp. 1113-1115 ◽  
Author(s):  
M. Oyaizu ◽  
E. Tojyo ◽  
S. C. Jeong ◽  
H. Ishiyama ◽  
H. Miyatake ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Ion Source ◽  
Electron Cyclotron ◽  
Pulsed Magnetic Field

Status of the pulsed magnetic field electron cyclotron resonance ion source

1994 ◽  
Vol 65 (4) ◽  
pp. 1078-1080 ◽  
Author(s):  
C. Mühle ◽  
U. Ratzinger ◽  
W. Bleuel ◽  
G. Jöst ◽  
K. Leible ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Ion Source ◽  
Electron Cyclotron ◽  
Pulsed Magnetic Field ◽  
Field Electron
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