Direct measurements of electron density, temperature and ion composition in an equatorial spread-F ionosphere

Details Direct measurements of electron density, temperature and ion composition in an equatorial spread-F ionosphere Direct measurements of electron density, temperature and ion composition in an equatorial spread-F ionosphere

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43..463n&link_type=abstract

(International Symposium on Equatorial Aeronomy - I, 6th, Aguadilla, PR, July 17-23, 1980.) Journal of Atmospheric and Terrestri

Computer Science

Sound

29

Equatorial Atmosphere, Ionospheric Composition, Ionospheric Electron Density, Ionospheric Sounding, Ionospheric Temperature, Spread F, Magnetohydrodynamic Stability, Nitrogen Oxides, Oxygen Ions, Plasma Diagnostics, Plumes, Rocket Sounding

Scientific paper

In situ measurements of electron density, temperature, and ion composition of the equatorial spread-F region were obtained by plasma probes, electric field sensors, a mass spectrometer, and a four-frequency beacon experiment from two rockets launched into the topside F-region ionosphere to gain more understanding of the detailed relationships involving large-scale plasma depletions and associated ion-chemical signatures. The differences in the prevailing ionospheric conditions are discussed by analyzing the electron density profiles obtained on the two occasions. It is reported that in the first operation (into a spread-F decay phase) several major depletions were distributed throughout the F-region, from its bottomside gradient centered near 260 km to a topside altitude of 500 km; in the second operation (launched into a mid-phase development of spread-F) irregularities were observed only on the bottomside gradient. In both cases O(+) was the dominant F-region ion down to the very bottom of the F-ledge. At altitudes below F-bottom, molecular ions dominated with a scale height approaching infinity. Among the conclusions presented is that neutral atmospheric turbulence is not a major source of bottomside irregularities.

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