Accession Number : AD0766978

Title :   Diurnal Variations in the D. Region During PCA Events (42),

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Swider,W. ; Keneshea,T. J.

Report Date : 28 AUG 1973

Pagination or Media Count : 49

Abstract : Extensive computations have been performed in order to simulate the diurnal behavior of the D region during PCA events. Computations using 98 reactions with only NO+ and O2+ as positive ions apparently yield too much 30 MHz riometer absorption. Nevertheless, the argument of Swider et al (1971) is substantiated that this simple positive ion chemistry is sufficient regarding the deduction of the nighttime electron concentration profile. Expansion of the computer code to 195 reactions, including species like 9H3O+.H2O)n provides more reasonable results as far as the positive ion chemistry is concerned since such ions are known to exist in the D region. However, too few electrons appear to be generated in the 50-65 km region, which is indicative of insufficient knowledge of the negative ion chemistry. (Modified author abstract)

Descriptors :   (*IONOSPHERIC DISTURBANCES, DIURNAL VARIATIONS), ELECTRON DENSITY, CHARGED PARTICLES, IONIZATION, CHEMICAL REACTIONS, POLAR REGIONS

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE