Other
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29..775k&link_type=abstract
Planetary and Space Science, vol. 29, July 1981, p. 775-782. Deutsche Forschungsgemeinschaft
Other
3
Annual Variations, Diurnal Variations, Fourier Series, Ionospheric Electron Density, Ionospheric Ion Density, Spherical Harmonics, Helium Ions, Hydrogen Ions, Neon, Nitrogen Ions, Oxygen Ions, Time Dependence
Scientific paper
The diurnal and seasonal variations of H(+), He(+), N(+), O(+), and Ne are analyzed at 1400-km altitude. Using longitudinally averaged observations of ISIS-2 (April 1971 to December 1972), the ion and electron densities are decomposed via spherical harmonics and Fourier series into time-independent, seasonal and diurnal terms. The time-independent terms of H(+) and He(+) show a plateau- or trough-like structure at medium to low latitudes and a strong decrease towards the poles; N(+) and O(+), on the other hand, yield an almost inverse picture with a density increase at high latitudes. All constituents, except He(+) show at polar latitudes an enhancement during local summer conditions and a depletion during local winter conditions; He(+), however, exhibits a winter bulge and a density minimum during local summer. The diurnal variations are strongly latitude dependent; while the amplitudes (relative) of H(+), He(+), and Ne are rather small, the heavier ions N(+) and O(+) show a deep minimum early in the morning and a high but flat maximum during daytime.
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