scholarly journals Spiky parallel electrostatic ion cyclotron and ion acoustic waves

2002 ◽  
Vol 9 (1) ◽  
pp. 25-29 ◽  
Author(s):  
R. V. Reddy ◽  
G. S. Lakhina ◽  
N. Singh ◽  
R. Bharuthram
Keyword(s):  
Electric Fields ◽  
Acoustic Waves ◽  
Rest Frame ◽  
Wave Form ◽  
Ion Acoustic Waves ◽  
Parallel Propagation ◽  
Wave Phase Velocity ◽  
Ion Acoustic ◽  
Ion Cyclotron ◽  
Field Aligned Current

Abstract. One of the interesting observations from the FAST satellite is the detection of strong spiky waveforms in the parallel electric field in association with ion cyclotron oscillations in the perpendicular electric fields. We report here an analytical model of the coupled nonlinear ion cyclotron and ion-acoustic waves, which could explain the observations. Using the fluid equations for the plasma consisting of warm electrons and cold ions, a nonlinear wave equation is derived in the rest frame of the propagating wave for any direction of propagation oblique to the ambient magnetic field. The equilibrium bulk flow of ions is also included in the model to mimic the field-aligned current. Depending on the wave Mach number M defined by M = V/Cs with V and Cs being the wave phase velocity and ion-acoustic speed, respectively, we find a range of solutions varying from a sinusoidal wave form for small amplitudes and low M to sawtooth and highly spiky waveforms for nearly parallel propagation. The results from the model are compared with the satellite observations.

Coupling of electrostatic ion cyclotron and ion acoustic waves in the solar wind

2016 ◽  
Vol 23 (8) ◽  
pp. 082901 ◽  
Author(s):  
T. Sreeraj ◽  
S. V. Singh ◽  
G. S. Lakhina
Keyword(s):  
Solar Wind ◽  
Acoustic Waves ◽  
Ion Acoustic Waves ◽  
Ion Acoustic ◽  
Ion Cyclotron

Coupling between Electrostatic Ion Cyclotron Waves and Ion Acoustic Waves

1973 ◽  
Vol 30 (12) ◽  
pp. 535-537 ◽  
Author(s):  
T. Ohnuma ◽  
S. Miyake ◽  
T. Watanabe ◽  
T. Watari ◽  
T. Sato
Keyword(s):  
Acoustic Waves ◽  
Ion Acoustic Waves ◽  
Ion Cyclotron Waves ◽  
Ion Acoustic ◽  
Ion Cyclotron

Property of Electrostatic Ion-Cyclotron Waves and Ion Acoustic Waves and Ion Acoustic Waves in a Magnetic Field

1976 ◽  
Vol 41 (2) ◽  
pp. 640-647 ◽  
Author(s):  
Toshio Ohnuma ◽  
Shoji Miyake ◽  
Tsuguhiro Watanabe ◽  
Teruyuki Sato ◽  
Tetsuo Watari
Keyword(s):  
Magnetic Field ◽  
Acoustic Waves ◽  
Ion Acoustic Waves ◽  
Ion Cyclotron Waves ◽  
Ion Acoustic ◽  
Ion Cyclotron

Ion-acoustic waves in large radio-frequency electric fields

1976 ◽  
Vol 19 (4) ◽  
pp. 557 ◽  
Author(s):  
A. Lee ◽  
W. D. Jones ◽  
S. M. Gleman ◽  
H. J. Doucet
Keyword(s):  
Radio Frequency ◽  
Electric Fields ◽  
Acoustic Waves ◽  
Ion Acoustic Waves ◽  
Ion Acoustic ◽  
Radio Frequency Electric Fields

Nonlinear electrostatic waves: oblique propagation

1981 ◽  
Vol 26 (3) ◽  
pp. 399-406 ◽  
Author(s):  
R. W. Jackson
Keyword(s):  
Acoustic Waves ◽  
Initial Conditions ◽  
Wave Form ◽  
Ion Acoustic Waves ◽  
Electrostatic Wave ◽  
Electrostatic Waves ◽  
Oblique Propagation ◽  
Ion Acoustic ◽  
Wave Forms ◽  
Fast Ion

The fluid equations for electrostatic wave forms propagating at small angles to a constant magnetic field are investigated. Both ion cyclotron and charge separation effects are included. Numerical results are given for initial conditions which are consistent with soliton formation. These results show a hybrid nonlinear wave form containing oscillations which are identified as short-wavelength fast ion-acoustic waves and long-wavelength slow ion-acoustic waves. An approximate analytic analysis is performed using the Bogoliubov–Krylov–Mitropolskii perturbation method.

scholarly journals High time resolution PFISR and optical observations of naturally enhanced ion acoustic lines

2009 ◽  
Vol 27 (4) ◽  
pp. 1457-1467 ◽  
Author(s):  
R. G. Michell ◽  
K. A. Lynch ◽  
C. J. Heinselman ◽  
H. C. Stenbaek-Nielsen
Keyword(s):  
High Resolution ◽  
Time Resolution ◽  
Acoustic Waves ◽  
Fast Moving ◽  
High Time ◽  
High Time Resolution ◽  
Ion Acoustic Waves ◽  
Raw Data ◽  
Ion Acoustic ◽  
Auroral Imaging

Abstract. Observations of naturally enhanced ion acoustic lines (NEIALs) taken with the Poker Flat Incoherent Scatter Radar (PFISR) using a mode with very high time resolution are presented. The auroral event took place over Poker Flat, Alaska on 8 February 2007 at 09:35 UT (~22:00 MLT), and the radar data are complemented by common-volume high-resolution auroral imaging. The NEIALs occurred during only one of the standard 15-s integration periods. The raw data of this time show very intermittent NEIALs which occur only during a few very short time intervals (≤1 s) within the 15-s period. The time sampling of the raw data, ~19 ms on average, allows study of the time development of the NEIALs, though there are indications that even finer time resolution would be of interest. The analysis is based on the assumption that the NEIAL returns are the result of Bragg scattering from ion-acoustic waves that have been enhanced significantly above thermal levels. The spectra of the raw data indicate that although the up- and down-shifted shoulders can both become enhanced at the same time, (within 19 ms), they are most often enhanced individually. The overall power in the up-and down-shifted shoulders is approximately equal throughout the event, with the exception of one time, when very large up-shifted power was observed with no corresponding down-shifted power. This indicates that during the 480 μs pulse, the strongly enhanced ion-acoustic waves were only traveling downward and not upward. The exact time that the NEIALs occurred was when the radar beam was on the boundary of a fast-moving (~10 km/s), bright auroral structure, as seen in the high resolution auroral imaging of the magnetic zenith. When viewed with high time resolution, the occurrence of NEIALs is associated with rapid changes in auroral luminosity within the radar field of view due to fast-moving auroral fine structures.

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