Physics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3201103z&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 1, CiteID L01103
Physics
3
Ionosphere: Electric Fields (2712), Ionosphere: Ion Chemistry And Composition (0335), Ionosphere: Ionospheric Dynamics, Ionosphere: Ionospheric Irregularities, Ionosphere: Midlatitude Ionosphere
Scientific paper
The ionospheric E-region from 100 km to 150 km is typically regarded as being in photo-chemical equilibrium (PCE) state during daytime. Incoherent scatter radar observations at Arecibo show that PCE is not always valid. During July 31-Aug. 5, 1992, the vertical ion drift was observed to increase by 50 m/s over a ten kilometer altitude range. The large divergence resulting from the steep velocity gradient reduced the electron concentration by 30%, invalidating the generally held PCE. Observations of non-PCE allow us to estimate the chemical loss rate. By assuming that the loss rate does not have a day-to-day variability, the dissociative recombination rate derived from the incoherent scatter radar (ISR) observation is about 1.0 × 10-7 cm3s-1, which is significantly lower than the laboratory rate of NO+, or O2+. The most plausible explanation for the discrepancy is that the relative concentration of O2+ and NO+ changed significantly when non-PCE occurred.
Morton Yu T.
Zhou Qihou H.
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