Simulations of structure formation in the Universe predict accretion shock waves at the boundaries of the large-scale structures as sheets, filaments, and clusters of galaxies. If magnetic fields are present at these shocks, particle acceleration should take place, and could contribute to the observed cosmic rays of high energies. When the radio plasma of an old invisible radio lobe is dragged ...

Simulation results of indoor radio wave propagation at 60 GHz based on ray launching are presented and compared with measurement results. The results show that the statistical properties of the generated simulation sets are quite close to the statistical properties of the measurement sets. This indicates, that there are no mechanisms that cause a significant tendency to deviate in one direction...

We demonstrate that nonlinear decay of obliquely propagating Langmuir waves into another Langmuir and Alfvén waves is possible in a one-dimensional, highly relativistic, streaming, pair plasma. Based on this we present a new mechanism of pulsar radio emission that involves development and quasilinear relaxation of two stream instability, induced scattering of generated Langmuir waves by plasma ...

Communications have come to rely heavily on ionospheric radio in spite of the sometimes unpredictable behavior of the ionosphere as a transmission medium. Far from being the static reflector of radio waves that the communicator would desire, the ionosphere continuously and sometimes suddenly, undergoes structural changes on almost all scales of size and time. Such changes upset the often delica...

The large-scale coronal shock waves observed from radio type II bursts and from Moreton waves have proven surprisingly difficult to detect in coronal images. I review the evidence for such waves in radio, optical, EUV, and soft X-ray images. The data generally support the conclusion that the metric type II bursts can be identified with weak fast-mode shock waves launched at the impulsive phase ...

During ONR’s Shoaling Waves Experiment (SHOWEX) off the coast of North Carolina in November and December 1999, measurements of wind speed and direction as well as air and water temperatures were made using a variety of techniques. This paper shows a comparison of the measurements taken on December 3,