Physics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jatp...37..895m&link_type=abstract
(IAU, IUGG, URSI, IUPAP, COSPAR, and SCOSTEP, International Solar-Terrestrial Physics Symposium, 4th, Sao Paulo, Brazil, June 17
Physics
3
D Region, Ionospheric Disturbances, Polar Cap Absorption, Solar Eclipses, Solar Flares, Atmospheric Chemistry, Ion Production Rates, Ionospheric Electron Density, Ionospheric Ion Density, Particle Energy
Scientific paper
A unified picture of the chemistry of the normal and disturbed D-regions is presented. Under disturbed conditions are included solar flares, PCAs, and solar eclipses. The connecting thread is the six-ion model of Mitra and Rowe with appropriate modifications where necessary. Several areas of identify in the observational results of flares and PCAs are reviewed. These include: the dominance of the production-rate parameter of O2(+) over that of NO(+) due to X-rays in the first case and energetic particles in the second; drastic decrease in the effective loss coefficient during both flares and PCAs; disappearance of water cluster ions down to 73 km during the day and 78 km at night during PCAs; the reversion of negative ions to their basic forms, O(-) and O2(-), during PCAs. For solar eclipses, the effects are essentially a mirror image of these due to flares and PCAs.
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