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Detailed Reference Information |
Crawford, G.K., Strangeway, R.J. and Russell, C.T. (1993). VLF imaging of the Venus foreshock. Geophysical Research Letters 20: doi: 10.1029/93GL01258. issn: 0094-8276. |
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VLF plasma wave measurements obtained from the Pioneer Venus Orbiter Electric Field Detector (OEFD) have been used to construct statistical images of the Venus foreshock. Our data set contains all upstream measurements from an entire Venus year (~200 orbits). Since the foreshock VLF characteristics vary with IMF orientation we restrict the study to IMF orientations near the nominal Parker spiral angle (25¿ to 45¿). Our results show a strong decrease in 30 kHz wave intensity with both foreshock depth and distance. There is also an asymmetry in the 30 kHz emissions from the upstream and downstream foreshocks. The ion foreshock is characterized by strong emissions in the 5.4 kHz OEFD channel which are positioned much deeper in the foreshock than expected from terrestrial observations. No activity is observed in the region where field aligned ion distributions are expected. ULF wave activity, while weaker than at Earth, shows similar behavior and may indicate the presence of similar ion distributions. ¿ American Geophysical Union 1993 |
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Abstract |
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Keywords
Magnetospheric Physics, Solar wind interactions with unmagnetized bodies |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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