Positive ion composition and derived particle heating in the lower auroral ionosphere

Details Positive ion composition and derived particle heating in the lower auroral ionosphere Positive ion composition and derived particle heating in the lower auroral ionosphere

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..301k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 47, Jan.-Mar. 1985, p. 301-308. Sponsorship: Swiss Nationa

Physics

11

Auroral Zones, Ionospheric Composition, Ionospheric Heating, Ionospheric Ion Density, Lower Ionosphere, Particle Precipitation, D Region, Ionospheric Electron Density, Magnetic Disturbances, Mass Spectroscopy, Pair Production, Positive Ions, Rocket-Borne Instruments

Scientific paper

Two E11a rocket flights in salvo B (launched on November 16, 1980) and A2 (launched on November 30, 1980), which provide positive ion composition, total and partial ion density, and electron density in the altitude range 60-170 km above Kiruna under conditions of moderate and strong magnetic disturbance, are examined. It is shown that the ionization sources are predominantly precipitating electrons in salvo B and precipitating protons in salvo A2. Under winter-time auroral conditions the characteristics of the positive ion composition are large NO(+)/O2(+) density ratios, with maximum values of 20 at 118 km in salvo B and 100 at 100 km in salvo A2, respectively. The transition from NO(+) to proton hydrates is found at an altitude of 79 km in salvo B and 76 km in salvo A2. The calculated O(+) and N(+) densities are in good agreement with model calculations and from these calculations it is concluded that 28(+) is mainly N2(+) above 110 km in salvo B and above 105 km in salvo A2, and Si(+) below these altitudes. By altitude integration of the ion-electron pair production, the energy flux of precipitating particles is found to have values of 0.85 mW/sq m and 1.0 mW/sq m in salvoes B and A2, respectively.

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