Physics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........27c&link_type=abstract
Ph.D. Thesis California Univ., Los Angeles, CA.
Physics
Ionopause, Planetary Ionospheres, Plasma Interactions, Plasma Waves, Solar Planetary Interactions, Solar Wind, Venus (Planet), Venus Atmosphere, Electron Emission, Heat Flux, Ion Acoustic Waves, Ion Distribution, Shock Waves
Scientific paper
We examine the plasma wave emissions which are generated due to the solar wind interaction with Venus. The analysis of these plasma waves provides a useful diagnostic of the underlying physical processes in the plasma allowing us to infer information about the particle distributions and instabilities. We use the measured wave emissions to construct statistical 'images' of the Venus foreshock. This analysis method allows us to develop a macroscopic picture of the wave properties, the inferred particle distributions, and their evolution as a function of position within the foreshock. The electron foreshock emissions are parallel polarized Langmuir mode waves with the same intensity at the foreshock boundary as the terrestrial emissions (10 mV/m). However, the wave characteristics differ markedly between the upstream and downstream foreshocks for Parker spiral IMF orientations. Additionally there is a dramatic decrease in intensity for distances beyond approximately 15 R(sub v) from the point of tangency along the foreshock boundary. Our observations provide conclusive evidence that reflection and energization of solar wind electrons at the shock provide the upstream source for the upstream electrons, not leakage. In the ion foreshock the wave emissions are parallel polarized ion acoustic like waves with similar intensities and spectral characteristics to terrestrial emissions. However, these waves are situated much deeper in the foreshock than expected from terrestrial observations. No emissions are observed in regions where field aligned ion distributions are expected. Rather the emissions are found in a region where diffuse ion distributions are expected. Lastly, we have evaluated the characteristics of the enhanced wave emissions at the dayside Venus ionopause. Previous theories had focused almost exclusively on wave measurements made in the 100 Hz OEFD channel and had suggested that these waves provided heat flux into the ionosphere. Rather we find that these broadband emissions are a different wave mode than hypothesized and probably not important in carrying heat flux into the ionosphere.
No associations
LandOfFree
A study of plasma waves arising from the solar wind interaction with Venus does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A study of plasma waves arising from the solar wind interaction with Venus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A study of plasma waves arising from the solar wind interaction with Venus will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1264308