D-region electron density diurnal changes observed in association with the PCA event of July 1974

Details D-region electron density diurnal changes observed in association with the PCA event of July 1974 D-region electron density diurnal changes observed in association with the PCA event of July 1974

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54.1169m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, no. 9, Sept. 1992, p. 1169-1175. Research supported by

Physics

D Region, Diurnal Variations, Ionospheric Electron Density, Lower Ionosphere, Particle Precipitation, Polar Cap Absorption, Energetic Particles, Geomagnetism, Magnetic Anomalies, Southern Hemisphere, Vertical Distribution

Scientific paper

Well defined diurnal phase and amplitude deviations of very low frequency radio signals propagation were detected during the solar proton event that occurred from 3 to 8 July 1974. Phase advances observed on signals transmitted from GBR (U.K.), received at Atibaia (Brazil) and at Inubo Radio Observatory (Japan), were compared with simultaneous NWC (Australia) transmissions received at Atibaia, and at Syowa Station (Antarctica). Emphasis was given to the propagation paths NWC-Atibaia and NWC-Syowa, because both propagate completely in the Southern Hemisphere, crossing regions where the earth's magnetic field behaves anomalously. The comparison allowed the determination of parameters typical of the D-region at a given height in the lower ionosphere, for geomagnetic regions defined through the McIlwain parameter(L). An exponential model was adopted to fit the vertical distribution of the diurnal electron density. The experimental results showed a delayed contribution to the total ionization observed which was attributed to a slow precipitation of energetic particles in the South Atlantic Geomagnetic Anomaly region.

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