Computer Science – Sound
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jhatd...5..114r&link_type=abstract
Johns Hopkins APL Technical Digest (ISSN 0270-5214), vol. 5, Apr.-June 1984, p. 114-119.
Computer Science
Sound
Cold Plasmas, Ionospheric Sounding, Plasma Density, Polar Regions, Satellite-Borne Instruments, Scientific Satellites, Electrostatic Probes, Plasma Drift, Radio Frequency Interference, Thermal Plasmas, Volt-Ampere Characteristics
Scientific paper
A major objective of the HILAT mission is to study the disturbance of radio signals passing through the turbulent, ionized gas or plasma of the ionosphere. Because the disturbance is proportional to the density of the plasma through which the signal is passing, most of the disturbance occurs at altitudes of 300 to 500 km, several hundred kilometers below the satellite. Cold plasma (less than 1 electronvolt, corresponding to 13,000 K) measurements are made at the location of the spacecraft in order to determine the large-scale variations of density with respect to the latitude and the flow speed of the plasma. These parameters are known to affect plasma turbulence at altitudes of 300 to 500 km and are only slightly affected by the difference in altitude from there to the spacecraft. Plasma turbulence at the spacecraft altitude is also being measured, but the relationship between local turbulence and turbulence below the spacecraft has not yet been established.
Anderson Brian P.
Girouard D.
Hanson William B.
Harmon L. L.
Heelis Roderick A.
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