Accession Number : AD0694869

Title :   RESULTS DERIVED FROM SIMULTANEOUS MEASUREMENTS USING THE LANGMUIR PLATE AND SPHERICAL ION PROBE ON EXPLORER XXXI AND THE IONOSONDE ON ALOUETTE II,

Corporate Author : UNIVERSITY COLL LONDON (ENGLAND) MULLARD SPACE SCIENCE LAB

Personal Author(s) : Wrenn,G. L. ; Smith,P. A.

Report Date : 19 FEB 1969

Pagination or Media Count : 5

Abstract : Measurements of electron temperature, ion concentration, and ion temperature obtained by means of the Langmuir plate and spherical ion probe on the Explorer XXX1 satellite are presented together with results obtained at the same time from the Alouette 11 ionosonde for a period when the two satellites were close together. Electron concentration measurements by the sounder have been used for in-flight calibration of the probe total positive ion concentration measurements, and an effective grid transparency for the probe was obtained. Results from a set of measurements centered on a latitude near 70 degrees magnetic dip in the Australasian region are tabulated and have been used to determine vertical temperature gradients of the plasma on the basis of diffusive equilibrium theory. The calculated gradients are negative between altitudes of 650 and 1050 km. The reality of these negative gradients cannot be confirmed because the direct measurements of plasma temperature exhibit large day-to-day fluctuations so that a reliable height variation of temperature cannot be constructed. (Author)

Descriptors :   (*SCIENTIFIC SATELLITES, ATMOSPHERIC SOUNDING), (*LANGMUIR PROBES, TELEMETERING DATA), IONS, ELECTRON DENSITY, PLASMA SHEATHS, COLLECTING METHODS, TEMPERATURE, PERIODIC VARIATIONS

Subject Categories : Atmospheric Physics
      Unmanned Spacecraft
      Telemetry

Distribution Statement : APPROVED FOR PUBLIC RELEASE