scholarly journals Solitons and oscillitons in multi-ion space plasmas

2003 ◽  
Vol 10 (1/2) ◽  
pp. 121-130 ◽  
Author(s):  
K. Sauer ◽  
E. Dubinin ◽  
J. F. McKenzie
Keyword(s):  
Low Frequency ◽  
Wave Number ◽  
Space Plasmas ◽  
Linear Dispersion ◽  
Fast Speed ◽  
Stationary Structure ◽  
Ion Plasma ◽  
New Type ◽  
Complex Solutions ◽  
Low Frequency Waves

Abstract. It is well known that additional low-frequency waves arise when a second ion population is added to a plasma normally consisting of protons and electrons. Here, we investigate stationary structures streaming with a sub-fast speed in such a bi-ion plasma. It is shown that in addition to the usual "solitons", which have already been described for a single-ion plasma, a new type of stationary structure occurs due to the second ion population. This structure is associated with complex solutions of the linear dispersion relation in certain regions of the wave number-obliquity space. This implies that the corresponding soliton structure exhibits an oscillating spatial structure superposed on the usual spatial growth or decay. The full-blown solution of the nonlinear equations confirms that this is indeed the case. The related structure is called an "oscilliton". Examples of both types of stationary nonlinear waves (solitons and oscillitons), which may exist in a bi-ion plasma are given.

scholarly journals Two-point observations of low-frequency waves at 67P/Churyumov-Gerasimenko during the descent of PHILAE: comparison of RPCMAG and ROMAP

2016 ◽  
Vol 34 (7) ◽  
pp. 609-622 ◽  
Author(s):  
Ingo Richter ◽  
Hans-Ulrich Auster ◽  
Gerhard Berghofer ◽  
Chris Carr ◽  
Emanuele Cupido ◽  
...  
Keyword(s):  
Low Frequency ◽  
Minimum Variance ◽  
Wave Source ◽  
Frequency Wave ◽  
Final Destination ◽  
Connection Line ◽  
New Type ◽  
Current Instability ◽  
Comet 67P ◽  
Low Frequency Waves

Abstract. The European Space Agency's spacecraft ROSETTA has reached its final destination, comet 67P/Churyumov-Gerasimenko. Whilst orbiting in the close vicinity of the nucleus the ROSETTA magnetometers detected a new type of low-frequency wave possibly generated by a cross-field current instability due to freshly ionized cometary water group particles. During separation, descent and landing of the lander PHILAE on comet 67P/Churyumov-Gerasimenko, we used the unique opportunity to perform combined measurements with the magnetometers onboard ROSETTA (RPCMAG) and its lander PHILAE (ROMAP). New details about the spatial distribution of wave properties along the connection line of the ROSETTA orbiter and the lander PHILAE are revealed. An estimation of the observed amplitude, phase and wavelength distribution will be presented as well as the measured dispersion relation, characterizing the new type of low-frequency waves. The propagation direction and polarization features will be discussed using the results of a minimum variance analysis. Thoughts about the size of the wave source will complete our study.

scholarly journals A study on Electron Oscillations in the Magnetosheath of Mars with Mars Express observations

2016 ◽  
Vol 12 (S328) ◽  
pp. 230-232
Author(s):  
Adriane M. de Souza ◽  
Ezequiel Echer ◽  
Mauricio J. A. Bolzam ◽  
Markus Fränz
Keyword(s):  
Wavelet Transform ◽  
Electron Density ◽  
Low Frequency ◽  
Morlet Wavelet ◽  
Space Plasmas ◽  
Density Data ◽  
Mars Express ◽  
Preliminary Study ◽  
Morlet Wavelet Transform ◽  
Low Frequency Waves

AbstractWavelet analysis was employed to identify the major frequencies of low-frequency waves present in the Martian magnetosheath. The Morlet wavelet transform was selected and applied to the electron density data, obtained from the Analyzer of Space Plasmas and Energetic Atoms experiment (ASPERA-3), onboard the Mars Express (MEX) spacecraft. We have selected magnetosheath crossings and analyzed electron density data. From a preliminary study of 502 magnetosheath crossings (observed during the year of 2005), we have found 1409 periods between 0.005 and 0.06Hz. The major frequencies observed were in the range 0.005-0.02 Hz with 58.5% of the 1409 frequencies identified.

scholarly journals Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko

2015 ◽  
Vol 33 (8) ◽  
pp. 1031-1036 ◽  
Author(s):  
I. Richter ◽  
C. Koenders ◽  
H.-U. Auster ◽  
D. Frühauff ◽  
C. Götz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Field Measurements ◽  
New Type ◽  
Current Instability ◽  
Interaction Regions ◽  
Activity State ◽  
Comet 67P ◽  
Low Frequency Waves ◽  
Made In

Abstract. We report on magnetic field measurements made in the innermost coma of 67P/Churyumov-Gerasimenko in its low-activity state. Quasi-coherent, large-amplitude (δ B/B ~ 1), compressional magnetic field oscillations at ~ 40 mHz dominate the immediate plasma environment of the nucleus. This differs from previously studied cometary interaction regions where waves at the cometary ion gyro-frequencies are the main feature. Thus classical pickup-ion-driven instabilities are unable to explain the observations. We propose a cross-field current instability associated with newborn cometary ion currents as a possible source mechanism.

The propagation of very low-frequency waves in ducts in the magnetosphere. Il

1972 ◽  
Vol 329 (1577) ◽  
pp. 219-231 ◽  
Keyword(s):  
Low Frequency ◽  
Angular Spectrum ◽  
Trapped Modes ◽  
Trapped Mode ◽  
Leaky Modes ◽  
Integral Methods ◽  
Barrier Region ◽  
New Type ◽  
Forbidden Region ◽  
Low Frequency Waves

Because of transverse gradients of refractive index, magnetospheric ducts which guide whistlers are not isolated. The whistlers are likely to leak from the ducts through a forbidden region owing to barrier penetration by evanescent waves. This phenomenon is investigated theoretically by using the WKB J approximation and phase integral methods. A new type of mode called a quasi-trapped mode is discussed. It is shown that, if a wave packet is incident on a duct capable of sustaining quasi-trapped modes, certain components of its angular spectrum are selectively trapped. These travel in quasi-trapped modes for considerable distances before leaking from the duct. Expressions are derived for the distance travelled in terms of the width of the duct, the width of the barrier region, and the properties of the medium. A connexion between this type of solution and a solution in terms of leaky modes is discussed.

scholarly journals Lower hybrid turbulence and ponderomotive force effects in space plasmas subjected to large-amplitude low-frequency waves

1996 ◽  
Vol 23 (8) ◽  
pp. 797-800 ◽  
Author(s):  
G. V. Khazanov ◽  
T. E. Moore ◽  
E. N. Krivorutsky ◽  
J. L. Horwitz ◽  
M. W. Liemohn
Keyword(s):  
Large Amplitude ◽  
Ponderomotive Force ◽  
Low Frequency ◽  
Space Plasmas ◽  
Lower Hybrid ◽  
Low Frequency Waves

PEMANFAATAN RADIASI ENERGI TEGANGAN 150 KV UNTUK LAMPU LED PENERANGAN JALAN

Jurnal Teknik ◽  
2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Mauludi Manfaluthy
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
High Voltage ◽  
Low Frequency ◽  
Energy Utilization ◽  
World Health ◽  
Electromagnetic Signals ◽  
Health Organization ◽  
The Magnetic Field ◽  
Low Frequency Waves

WHO (World Health Organization) concludes that not much effect is caused by electric field up to 20 kV / m in humans. WHO standard also mentions that humans will not be affected by the magnetic field under  100 micro tesla and that the electric field will affect the human body with a maximum standard of 5,000 volts per meter. In this study did not discuss about the effect of high voltage radiation SUTT (High Voltage Air Channel) with human health. The research will focus on energy utilization of SUTT radiation. The combination of electric field and magnetic field on SUTT (70-150KV) can generate electromagnetic (EM) and radiation waves, which are expected to be converted to turn on street lights around the location of high voltage areas or into other forms. The design of this prototype works like an antenna in general that captures electromagnetic signals and converts them into AC waves. With a capacitor that can store the potential energy of AC and Schottky diode waves created specifically for low frequency waves, make the current into one direction (DC). From the research results obtained the current generated from the radiation is very small even though the voltage is big enough.Keywords : Radiance Energy, Joule Thief, and  LED Module.

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