In plasma physics, an ion acoustic wave is one type of longitudinal oscillation of the ions and electrons in a plasma, much like acoustic waves traveling in neutral gas. However, because the waves propagate through positively charged ions, ion acoustic waves can interact with their electromagnetic fields, as well as simple collisions. In plasmas, ion acoustic waves are frequently referred to as acoustic waves or even just sound waves. They commonly govern the evolution of mass density, for instance due to pressure gradients, on time scales longer than the frequency corresponding to the relevant length scale. Ion acoustic waves can occur in an unmagnetized plasma or in a magnetized plasma parallel to the magnetic field. For a single ion species plasma and in the long wavelength limit, the waves are dispersionless () with a speed given by (see derivation below)
where is the Boltzmann constant, is the mass of the ion, is its charge, is the temperature of the electrons and is the temperature of the ions. Normally γe is taken to be unity, on the grounds that the thermal conductivity of electrons is large enough to keep them isothermal on the time scale of ion acoustic waves, and γi is taken to be 3, corresponding to one-dimensional motion. In collisionless plasmas, the electrons are often much hotter than the ions, in which case the second term in the numerator can be ignored.
plasma physics, an ionacousticwave is one type of longitudinal oscillation of the ions and electrons in a plasma, much like acousticwaves traveling in neutral...
electrostatic force (the Te term in vs), and the ion pressure (the Ti term in vs). Waves in plasmas Ionacousticwave Upper hybrid oscillation Lower hybrid oscillation...
electromagnetic waves (VLF) and atmospheric ions (present in the central white-coloured ball) through ion-acousticwaves. O+ 2 ions (electronic transition...
appear in other applications than surface gravity waves as well, for instance to describe ionacousticwaves in plasma physics. The Korteweg–de Vries equation...
(but was not found experimentally). Electrostatic ion cyclotron waveWaves in plasmas Ionacousticwave Upper hybrid oscillation Carlson, Arthur W. (1987)...
{\frac {R}{c_{\mathrm {s} }}},} where cs is the speed of the ionacousticwave (or the Alfvén wave, if the magnetic pressure is higher than the plasma pressure)...
phonon wave-vector for long wavelengths. The frequencies of acoustic phonons tend to zero with longer wavelength. Longitudinal and transverse acoustic phonons...
Acoustic emission (AE) is the phenomenon of radiation of acoustic (elastic) waves in solids that occurs when a material undergoes irreversible changes...
trough of the potential of a solitary electrostatic wave structure travelling with ionacoustic speed in a two-component plasma. It now applies to various...
Benz, A. O.; Wentzel, D. G. (1980), "Solar Type I Radio Bursts: An Ion-AcousticWave Model", Radio Physics of the Sun, Dordrecht: Springer Netherlands...
reactions", U.S. patent 5,160,695, November 1992 (Method and apparatus — Ionacousticwaves). Nuclear technology portal Energy portal Physics portal Coulomb barrier...
The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C (68 °F), the speed of...
is the change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave. The Doppler effect is named after...
described sonic or acoustic black holes provide almost 100% absorption of the incident air-borne or structure-borne acousticwaves. Acoustic metric Analog...
The ion vibration current (IVI) and the associated ion vibration potential is an electric signal that arises when an acousticwave propagates through a...
H. (2006-01-01). "On extending the concept of double negativity to acousticwaves". Journal of Zhejiang University Science A. 7 (1): 24–28. doi:10.1631/jzus...
journals. He is the discoverer of the dust acousticwave in dusty plasmas and novel attractive force between ions at atomic dimensions in quantum plasmas...
emission of radiation (SASER) refers to a device that emits acoustic radiation. It focuses sound waves in a way that they can serve as accurate and high-speed...
development of a fast ion peak is described by the Sack-Schamel equation. A reef or spot of shallow water such as a shoal against which waves break may also...
theoretical point of view the existence of surface ionacousticwaves, cyclotron waves and eigen waves on the plasma-metal interface. In addition to this...
Brillouin lines of interest are generally seen in a Brillouin spectrum. Acousticwaves have three polarization directions one longitudinal and two transverse...