Physics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..467k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 467-470. Research supported by the Swedish Board for Spac
Physics
14
Interferometers, Plasma Density, Plasma Waves, Satellite Observation, Space Plasmas, Broadband, Spectrum Analysis
Scientific paper
The Viking spacecraft carried a plasma wave interferometer consisting of two Langmuir probes separated by 80 m. The interferometer has measured density irregularities in the frequency range 1-200 Hz which can be interpreted as field-aligned structures with phase velocities transverse to the geomagnetic field, which are small compared to the spacecraft velocity relative to the plasma. The spatial structures which have nearly zero frequency in the plasma frame are Doppler shifted up to frequencies as large as 200 Hz in the spacecraft frame. The broadband amplitude of the density irregularities is typically 0.1 to 0.5 percent. The density irregularities appear to be a common feature of the high-latitude ionosphere probed by Viking.
Gustafsson Georg
Holmgren Gunnar
Kelley Michael C.
Kintner Paul M.
Koskinen Hannu
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