Computer Science – Sound
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........7c&link_type=abstract
Ph.D. Thesis California Univ., Berkeley.
Computer Science
Sound
Extreme Ultraviolet Radiation, Ion Distribution, Plasmasphere, Ultraviolet Spectra, Apollo Soyuz Test Project, Explorer Satellites, Mathematical Models, Periodic Variations, Rocket Sounding, Solar Spectra
Scientific paper
Plasmaspheric ion distributions in the 500 to 30,000 km range were indirectly measured by observing selected lines of solar extreme ultraviolet spectrum resonantly scattered by different ionic species. The observations were made with a broad band photometer on the Apollo-Soyuz mission and an EUV spectrometer on board the STP78-1 satellite. A third experiment was conducted from rocketborne photometers. Several theoretical models of ion distributions were unable to explain the data obtained. A kinetic equilibrium model of ion distribution, which takes the effect of a nonhomogeneous magnetic field into account, was found to explain the observations. The measurements obtained suggest the existence of a bulge in the helium ion distribution in the winter hemisphere, similar to the observed bulge in the neutral helium distribution. The derived midlatitude summer to winter number density ratio of 0.6 is consistent with theoretical calculations based upon the production, loss and transport of helium ions. Due to the limited sensitivity of the EUV spectrometer at the Hell 304 A line, simultaneous He(-) and O(-) densities could not be obtained using this method.
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