Computer Science – Sound
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1390m&link_type=abstract
Journal of Geophysical Research, vol. 83, Apr. 1, 1978, p. 1390-1394.
Computer Science
Sound
2
Energy Spectra, Photoelectrons, Rocket Sounding, Thermosphere, Altitude, Electrostatic Probes, Geomagnetism, Particle Flux Density, Rocket-Borne Instruments, Satellite Observation, Spacecraft Charging
Scientific paper
Relative values of thermospheric photoelectron energy distributions between 2 and 100 eV were measured over the altitude range 100-220 km by using a 127-deg cylindrical electrostatic deflection analyzer flown on a rocket. The measured photoelectron spectra display distinct features that are theoretically predicted and are similar to those obtained in recent satellite experiments. The valleylike structure in the energy range 2-5 eV attributed to resonant-vibrational excitation of N2 was observed in more detail and over a greater altitude range than that measured previously. The prominence of this low-energy valley decreases with increasing altitude above about 150 km and disappears above 200 km, in general agreement with theory. However, in contrast to theoretical predictions, the low-energy valley also appears to become less prominent as altitude decreases below about 140 km, down to the lowest observations at 100 km.
Heroux L.
McMahon Jay W.
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