Abstract
During the ACTIVE satellite mission in 1989/90, neutral xenon gas was released from the satellite. The release, 50g/sec, with velocity 250m/sec quasiperpendicular to the geomagnetic field occurred at different ionospheric altitudes. Parallel with the release process the VLF plasma waves (20Hz–20kHz) were recorded. The very high level of VLF emission during the release was registered and observed for some frequencies to extend some seconds beyond the release. It suggests for creation of expanding plasma cloud close to the satellite. It is difficult to use these observation for a clear CIV test because of incomplete darkness experimental conditions. This paper presents the observed VLF emission characteristics.
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