Ions of the nighttime mid-latitude E- and D-regions: a comparison between measurements and the UBAIM ion model

Details Ions of the nighttime mid-latitude E- and D-regions: a comparison between measurements and the UBAIM ion model Ions of the nighttime mid-latitude E- and D-regions: a comparison between measurements and the UBAIM ion model

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.530..363k&link_type=abstract

In: 16th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 2 - 5 June 2003, Sankt Gallen, Switzerlan

Physics

Earth Atmosphere: Physics, Earth Atmosphere: Chemistry

Scientific paper

The non-metallic main positive ions NO+ and O2+ of the nighttime E-region measured above White Sands New Mexico (32.42°N) with a magnetic mass spectrometer on the NASA rocket 33.041 are compared with results from the most recent version of the University of Bern Atmospheric Ion Model (UBAIM 5.25). The measurement in the evening of October 23 1984 with the sun at a solar zenith angle of 115.7° represents the only mid-latitude nighttime ion composition measurement of the D- and E-region. The results show a dominant metallic ion layer between 90 and 104 km altitude with a corresponding strong depletion of the main molecular ion NO+. The metal ions can be partly related to the origin of Orionid meteors and its parent comet Halley. A superimposed thin sporadic E-layer was present at 101 km altitude with a peak density of 3×104 cm-3. The relative abundance of the main ions Fe+, Mg+, Ca+, Na+, K+, and Mn+ is similar to carbonaceous chondrites, whereas the Al+ and Ni+ are strongly reduced. The normal proton hydrates of the daytime D-region were only observed between 74 km and 88 km in low abundance and with a maximum density of 200 cm-3. Below 74 km the ion densities of the D-region were below the instrument detection limit of 10 cm-3.

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