Particle precipitation in the ionospheric F2 region at locations in the vicinity of the South Atlantic anomaly

The f sub 0 F sub 2 daily variation characteristics were compared for IGY equinox months for pairs of stations at roughly similar dip angles. One station in each pair was in the South African continent and another in the South-American continent. It was found that locations on the west coast of South Africa showed larger f sub 0 F sub 2 in the afternoon hours as compared to locations on the east coast of South America. It is suggested that at least a part of this excess may be due to particle precipitation effects in the South African region which may be nearer to the center of the South Atlantic particle precipitation anomaly.