RF IMPEDANCE PROBE MEASUREMENTS OF IONOSPHERIC ELECTRON DENSITIES
Radio frequency impedance probe measurements of ionospheric electron densities
RADIO FREQUENCY IMPEDANCE PROBE↗
Engineering topics
Jackson, J. E.
Publications and source records attributed to Jackson, J. E..
TOPSIDE SOUNDER PROGRAM
Nasa fixed-frequency topside-sounder satellite s-48 - upper ionosphere
TOPSIDE PROGRAM↗
RF IMPEDANCE PROBE MEASUREMENTS OF IONOSPHERIC ELECTRON DENSITIES
Ionospheric electron density profiles obtained by the cw propagation technique and by rf impedance probe techniques
IONOSPHERIC ELECTRON DENSITY↗
THE NASA TOPSIDE SOUNDER PROGRAM
Comparison of the fixed-frequency topside-sounder satellite s-48 with the alouette indicates the different technological methods used to accomplish similar scientific objectives
SATELLITE DESIGN↗
First Results in NASA Topside Sounder Satellite Program
Preliminary results of nasa topside sounder satellite program, using a two-frequency radio- pulse sounder
IONOSPHERIC SOUNDING↗
RF IMPEDANCE PROBE MEASUREMENTS OF IONOSPHERIC ELECTRON DENSITIES
Rf impedance probe measurements of ionospheric electron density obtained by aerobee-hi rocket
RADIO FREQUENCY IMPEDANCE PROBE↗
Calculation of small rocket trajectories using only rocket-to-launcher radial velocity data
Calculating small rocket trajectories using rocket to launcher radial velocity data
DOPPLER EFFECT↗
ROCKET MEASUREMENT OF THE ELECTRON DENSITY DISTRIBUTION IN THE TOPSIDE IONOSPHERE
Rocket measurement of the electron density distribution in the topside ionosphere
SCOUT LAUNCH VEHICLE↗
Rocket Measurement of a Daytime Electron Density Profile up to 620 Kilometers
On April 27, 1961 at 1502 EST a four-stage research rocket was fired from Wallops Island, Virginia, to measure the ionospheric electron density distribution by means of Seddon's CW propagation technique. This experimental technique is based upon the dispersive Doppler effect measured at two harmonically related frequencies, in this case f = 12.267 Mc and 6f = 73.6 Mc. The electron density profile measured above the peak of the F2 region is representative of a diffusive-equilibrium distribution in an isothermal ionosphere having a temperature of 1640 deg +/- 90 deg K. This result, when compared with satellite and other data, indicates that the upper ionosphere is in thermodynamic equilibrium.
Jackson, J. E.↗
SWEPT-FREQUENCY TOPSIDE SOUNDER CANADA S-27
Explore the source record for details and available documents.
Jackson, J. E.↗
Ionospheric Measurements Using Environmental Sampling Techniques
Two rockets were flown to peak altitudes of 220 km in September 1959 to test various methods planned for future measurements of ionization parameters in the ionosphere, exosphere, and interplanetary plasma. The experiments used techniques which sample the ambient environment in the immediate vicinity of the research vehicle. Direct methods were chosen since indirect propagation techniques do not provide the temperatures of charged particles, are insensitive to ion densities, and cannot measure local electron densities under all conditions. Very encouraging results have been obtained from a preliminary analysis of data provided by one of the two flights. A new rf probe technique was successfully used to determine the electron density profile. This was indicated by its agreement with the results of a companion cw propagation experiment, particularly when the probe data were corrected for the effects of the ion sheath which surrounds the vehicle. The characteristics of this sheath were determined directly in flight by an electric field meter which provided the sheath field, and by a Langmuir probe which measured the total potential across the sheath. The electron temperatures deduced from the Langmuir probe data are greater than the neutral gas temperatures previously measured for the same location and season, but these measurements possibly were taken under different atmospheric conditions. Ion densities were calculated from the ion trap data for several altitudes ranging from 130 to 210 km and were found to be within 20 percent of the measured electron densities.
Bourdeau, R. E.↗