Surface modification of Si(100) wafers induced by argon-ion implantation (ion energy, 300keV; dose, 10" 10'' atoms/cm2) was investigated using a transient reflecting grating technique. Effects of the implantation on velocity, intensity and onset time of surface acoustic waves (SAW) were discussed accompanying the acoustic anisotropy. SAW velocity dispersion was also examined for one of the ligh...

Multi-frequency observations of E-region coherent backscatter from decametre waves reveal that auroral echoes tend to comprise two spectral components superimposed, one at low Doppler shifts, below 250 m s−1, and the other Doppler shifted to near the ion-acoustic speed or above, up to 800 m s−1. The low Doppler shift component occurs at all look directions; Doppler shifts near the ion acoustic ...

A series of numerical simulations based on a recurrence-free Vlasov kinetic model using kinetic phase point trajectories are presented. Electron-ion plasmas and three-component (electron-iondust) dusty or complex plasmas are considered, via independent simulations. Considering all plasma components modeled through a kinetic approach, the linear and nonlinear behavior of ion acoustic excitations...

For more than 12 hours beginning on January 18, 2021, continuous narrowband electrostatic emissions were observed Parker Solar Probe near 20 solar radii. The <1000 Hz frequencies well below the local ion plasma frequency. Surprisingly, consisted of wave packets with shock-like envelopes, appearing repetitively at a ~1.5 rate. This repetitiveness correlated and was in phase low frequency electro...

A linear stability analysis of ion-acoustic and dust-acoustic waves is carried out using a multifluid model in the presence of ionization, ion drag, and collisions of ions and dust with the background neutral gas. It is found that an unstable dust-acoustic mode of nonzero real frequency can be generated via a resonance phenomenon. This resonance develops as the frequency of the dust-ion-acousti...