The solar flare of August 18, 1979 - Incoherent scatter radar data and photochemical model comparisons

Details The solar flare of August 18, 1979 - Incoherent scatter radar data and photochemical model comparisons The solar flare of August 18, 1979 - Incoherent scatter radar data and photochemical model comparisons

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9516705z&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Sept. 20, 1990, p. 16705-16718. Research supported by NSF and DOE.

Physics

8

Electron Density (Concentration), Incoherent Scatter Radar, Photochemical Reactions, Solar Flares, Solar X-Rays, Atmospheric Chemistry, Earth Ionosphere, Goes 2, International Sun Earth Explorer 3, Vertical Distribution

Scientific paper

Measurements of electron density at seven D region altitudes were made with the Arecibo radar during a class X solar flare on August 18, 1979. Measurements of solar X-ray fluxes during the same period were available from the GOES 2 satellite (0.5-4 A and 1-8 A) and from ISEE 3 (in four bands between 26 and 400 keV). From the X-ray flux data, ionization rates in the D region and the associated chemical changes were computed using a coupled atmospheric chemistry and diffusion model (with 997 chemical reactions and 19 vertical levels). The computed electron densities matched the data quite well after the rate coefficients of three reactions was adjusted, namely, O2(-) + O2(1Delta) yielding e + O2 + O2, O2(+) + O2 + M yielding O4(+) + M, and O4(+) + O yielding O2(+) + O3. Also discussed are the hierarchies among the many flare-induced chemical reactions in two altitude ranges within the D region and the possible effects of two separate isomeric forms of O4(+).

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