Engineering topics
Publications and source records attributed to Herman, J. R..
The quantity of helium in the Venus atmosphere is estimated from an examination of the measured ionization profiles. The amount of helium necessary to give agreement between the computed and experimental results is approximately 4 x 10 to the 8th power/cucm at 140 km. When an eddy diffusion coefficient of 1,000,000 sq cm/see is used, the atmospheric helium mixing ratio is found to be 0.0006; a value nearly ten times that for earth.
Radio Astonomy Explorer (RAE) 1 data are analyzed to establish characteristics of HF terrestrial radio noise at an altitude of about 6000 km. Time and frequency variations in amplitude of the observed noise well above cosmic noise background are explained on the basis of temporal and spatial variations in ionospheric critical frequency coupled with those in noise source distributions. It is shown that terrestrial noise regularly breaks through the ionosphere and reaches RAE with magnitudes 15 or more db higher than cosmic noise background. Maximum terrestrial noise is observed when RAE is over the dark side of the Earth in the neighborhood of equatorial continental land masses where thunderstorms occur most frequently. The observed noise level is 30-40 db lower with RAE over oceans.
Multiple exospheric temperatures for Venus and Mars
Ionic and thermal structure model of daytime Venus ionosphere with solar wind heating based on Mariner 5 flyby mission
Venus daytime ionospheric models using electron, ion and neutral gas heat conduction with momentum and chemical equations for charged particle densities
Solar wind and Venus topside ionosphere interaction, discussing charged particle density, temperature and pressure distribution
Mariner 5 data for determining physical properties of Venus ionosphere
Topside ionosphere of Venus and interaction with solar wind using Mariner 5 two frequency experiment
Atomic oxygen density role in ionospheric E and F region magnetic stability, noting heat loss effect of atomic excitation
Simultaneous solution of continuity and heat conduction equations for ionospheric plasma consisting of electrons, atomic O ions and neutral gas species, discussing varying solar flux effects
Simultaneous solution of continuity and heat conduction equations for ionospheric electrons, ions and neutral species for studying F region magnetic storm behavior
Cooling effects of excited atomic oxygen on electron temperature in ionospheric E and F region
Conjugate echoes in Alouette 2 topside sounder ionograms explained by multiple reflections between conjugate points of field line, noting magnetospheric waveguides role
F region ionization and heating during magnetic storms
Field-aligned propagation of high frequency radio waves using Alouette 2 satellite data
High frequency radio wave propagation research using Alouette 2 topside sounder data and digital ray tracing techniques
Theoretical temperature and electro density profiles of E and F ionospheric regions