Low frequency sheath instability stimulated by the resonant absorption of a short microwave pulse

2003 ◽  
Author(s):  
M. Starodubtsev ◽  
K. Al-Hassan ◽  
H. Ito ◽  
N. Yugami ◽  
Y. Nishida
Keyword(s):  
Microwave Pulse ◽  
Low Frequency ◽  
Resonant Absorption

Low-frequency perfect sandwich meta-absorber based on magnetic metal

2019 ◽  
Vol 33 (06) ◽  
pp. 1950057 ◽  
Author(s):  
Longhui He ◽  
Dongyong Shan ◽  
Jun He ◽  
Sheng Liu ◽  
Zhiquan Chen ◽  
...  
Keyword(s):  
Magnetic Loss ◽  
Low Frequency ◽  
Surface Current ◽  
Resonant Absorption ◽  
Perfect Absorber ◽  
Perfect Electric Conductor ◽  
Nickel Metal ◽  
Electric Conductor ◽  
Magnetic Metal ◽  
Metamaterial Perfect Absorber

A metal-dielectric-metal (MDM) sandwich metamaterial perfect absorber (MPA) with magnetic nickel metal has been designed. An optimal absorption of 99.28% at 404 MHz is achieved for MPA with thickness of 5.54 mm. Resonant absorption is demonstrated to be main mechanism according to analyses on surface current distributions and electromagnetic field distributions. Furthermore, the electromagnetic energy is mainly dissipated in magnetic metal with magnetic loss proportion of 55.43% by comparatively analyzing the wave-absorbing performance of using magnetic metal, non-magnetic metal and perfect electric conductor (PEC) as metallic layers. These results would provide a guidance for the design of quasi-microwave absorbing/shielding materials.

scholarly journals Resonant absorption of Alfven Waves and the Associated Phenomenon of Magnetic Reconnection

1990 ◽  
Vol 142 ◽  
pp. 245-249
Author(s):  
C. Uberoi
Keyword(s):  
Surface Waves ◽  
Magnetic Reconnection ◽  
Low Frequency ◽  
Resonant Absorption ◽  
Magnetic Activity ◽  
Alfven Wave ◽  
Flux Transfer Events ◽  
Long Period ◽  
Magnetospheric Cusp ◽  
Zero Frequency

The mathematical analysis of the Alfven Wave equation in inhomogeneous magnetic fields which explain the resonance absorption of Alfven surface waves near a resonant layer can also be used to show that magnetic reconnection process can arise near the zero frequency resonant layer driven by very low frequency Alfven surface waves. The associated phenomena of resonant absorption and magnetic reconnection in inhomogeneous plasmas can explain the recent obsrevations of intense magnetic activity in the long period geomagnetic micropulsations range, at magnetospheric cusp latitudes, during the time of occurence of flux transfer events.

Observation of ion wave streamers and low frequency sheath instability by the resonant absorption due to nonlinear interaction of microwave-plasma

2004 ◽  
Vol 11 (2) ◽  
pp. 836-843 ◽  
Author(s):  
Md. Kamal-Al-Hassan ◽  
Mikhail Starodubtsev ◽  
Hiroaki Ito ◽  
Noboru Yugami ◽  
Yasushi Nishida
Keyword(s):  
Nonlinear Interaction ◽  
Microwave Plasma ◽  
Low Frequency ◽  
Resonant Absorption

Electrostatic modes in a magnetized plasma with a longitudinal density gradient

1983 ◽  
Vol 29 (2) ◽  
pp. 177-194 ◽  
Author(s):  
J. E. Maggs ◽  
G. J. Morales
Keyword(s):  
Magnetic Field ◽  
Density Gradient ◽  
Low Frequency ◽  
Resonant Absorption ◽  
Plasma Resonance ◽  
Magnetized Plasma ◽  
Auroral Ionosphere ◽  
Long Wavelength ◽  
Plasma Theory ◽  
The Magnetic Field

An analytic study is made of the electrostatic mode structures which exist between the upper-hybrid cut-off and the plasma resonance in a plasma in which the zero-order density gradient points along the magnetic field. In general the solutions consist of long-wavelength cold modes which are converted to short-wavelength Bohm-Gross modes near plasma resonance. However, there exist certain discrete angles of propagation at which finite solutions exist that can be described solely in terms of cold plasma theory. The relevance of these processes to resonant absorption experiments in the auroral ionosphere is considered. A brief study is made of the changes produced by a finite angle between the density gradient and the magnetic field. The possibility of finding analogous low-frequency structures is also investigated.

scholarly journals Resonant ULF absorption in storm time conditions

2017 ◽  
Vol 3 (1) ◽  
pp. 103-113
Author(s):  
Владимир Бадин ◽  
Vladimir Badin
Keyword(s):  
Magnetic Field ◽  
Variational Analysis ◽  
Spectral Power ◽  
Low Frequency ◽  
Resonant Absorption ◽  
Ulf Waves ◽  
Doppler Signals ◽  
Doppler Data ◽  
High Latitude Ionosphere ◽  
Field Lines

The work deals with ULF radar observations of the high-latitude ionosphere. Doppler data from the Norwegian STARE instrument are analyzed for the moderate magnetic storm observed on December 31, 1999–January 01, 2000. Upon averaging the Doppler signals along radar beams, the spectral power of signals is determined for each beam as a function of frequency ranging from 1 to 10 mHz. Sharp drops (about 10 dB) of spectral powers with frequency are found for all radar beams. A variational analysis of spectral powers is carried out by least squares, with power drops being modeled by stepwise profiles constructed of mean spectral powers preceding and succeeding the drops. Using this variational analysis, the frequency of the power drop is determined for each radar beam. Being averaged over all beams, this frequency is 4.8 ± 0.5 mHz. The results obtained are interpreted as resonant absorption of ultra-low-frequency (ULF) waves occurring on eigenfrequencies of magnetic field lines over wave propagation from the magnetopause deep into the magnetosphere.

scholarly journals Resonant ULF absorption at storm time conditions

2017 ◽  
Vol 3 (1) ◽  
pp. 79-87 ◽  
Author(s):  
Владимир Бадин ◽  
Vladimir Badin
Keyword(s):  
Magnetic Field ◽  
Variational Analysis ◽  
Spectral Power ◽  
Low Frequency ◽  
Resonant Absorption ◽  
Ulf Waves ◽  
Doppler Signals ◽  
Doppler Data ◽  
High Latitude Ionosphere ◽  
Field Lines

The work deals with ULF radar observations of the high-latitude ionosphere. Doppler data from the Norwegian STARE instrument are analyzed for the moderate magnetic storm observed on December 31, 1999–January 01, 2000. Upon averaging the Doppler signals along radar beams, the spectral power of signals is determined for each beam as a function of frequency ranging from 1 to 10 mHz. Sharp drops (about 10 dB) of spectral powers with frequency are found for all radar beams. A variational analysis of spectral powers is carried out by least squares, with power drops being modeled by stepwise profiles constructed of mean spectral powers preceding and succeeding the drops. Using this variational analysis, the frequency of the power drop is determined for each radar beam. Being averaged over all beams, this frequency is 4.8±0.5 mHz. The results obtained are interpreted as resonant absorption of ultra-low-frequency (ULF) waves occurring on eigenfrequencies of magnetic field lines over wave propagation from the magnetopause deep into the magnetosphere.

scholarly journals THE ION ENERGY IN A PLASMA RESONATOR EXCITED BY A POWERFUL MICROWAVE PULSE AT ECR FREQUENCY

2020 ◽  
pp. 97-100
Author(s):  
A.N. Antonov ◽  
V.S. Antipov ◽  
E.A. Kornilov ◽  
V.A. Miroshnichenko ◽  
V.A. Vinokurov
Keyword(s):  
Magnetic Field ◽  
Cyclotron Resonance ◽  
Microwave Pulse ◽  
Electron Cyclotron Resonance ◽  
Low Frequency ◽  
Argon Plasma ◽  
High Energy ◽  
Ion Energy ◽  
Plasma Ions ◽  
Powerful Microwave

The possibility of heating argon plasma ions with a density of ≈1013 cm-3 to 2 keV in a resonator placed in a magnetic field of a plug configuration when oscillations were excited at an electron-cyclotron resonance frequency with an electric field strength of up to 12 kV/cm in a pulse with a duration of 1.8 μs was shown experimentally. Ions acquire high energy in the fields of stochastic low-frequency ion oscillations due to the development of a modified decay of microwave oscillations.

The spectrum of second harmonic emission from a laser-produced plasma

1979 ◽  
Vol 22 (1) ◽  
pp. 149-156 ◽  
Author(s):  
R. A. Cairns
Keyword(s):  
Sound Wave ◽  
Second Harmonic ◽  
Wave Spectrum ◽  
Low Frequency ◽  
Resonant Absorption ◽  
Harmonic Spectrum ◽  
Theoretical Description ◽  
Critical Surface ◽  
Harmonic Emission ◽  
Good Agreement

Observations show a second harmonic spectrum which is broadened and shifted towards the low-frequency side of the true harmonic. A theoretical description of this effect is given based on the assumption that plasma waves generated by resonant absorption at the critical surface are coupled to a series of side-bands via an ion sound wave, and the resultant broadening of the plasma wave spectrum is reflected in the second harmonic emission. If the ion sound wave is propagating outwards, it is shown that, for suitable parameters, a large number of side-bands on the low-frequency side can be excited, giving a spectrum in good agreement with experimental results.

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