Harmonic Langmuir waves and multiple harmonic plasma emission are interesting nonlinear phenomena that take place during the electron beam-plasma interaction process. It is difficult to explain these nonlinear phenomena within the framework of the customary weak turbulence theory, so we put forth a theoretical explanation in the framework of the "g...
A generalized weak turbulence theory for electromagnetic emission at multiple harmonics of the plasma frequency is developed. In the literature, the electromagnetic emission at the plasma frequency and/or its second harmonic has been intensively studied. However, the emission at harmonics higher than the second harmonic is scarcely discussed. In th...
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Germany
Germany
The response of a cometary plasma tail to interplanetary shocks is studied by means of time dependent threedimensional MHD model simulations. Three major phenomena are identified which can be seen by ground based observations. First the plasma compressed by the shock forms tail rays. Secondly the shock excites a transversal standing wave in the tai...
Using the VLA, the IPS scattered disk of 3C279 has been imaged close to the sun with high spatial and temporal resolution. The resulting images have speckles, similar to those seen in short-exposure optical photographs of the seeing disk. A test for coherence in the scattered radiation is described, and it is shown that, under suitable observing co...
