The Study of Solar-Terrestrial Connections in the Brazilian Magnetic Anomaly Region

Abstract

The influence of solar-terrestrial connections on climate was investigated at
low latitudes near the equator in the Brazilian Magnetic Anomaly region
(BMAr). Two kinds of correlations of rainfalls in Brazil were observed: l. A
significant short time scale and long time scale correlation takes place between index of geomagnetic activity Kp and rainfall level in the state of São Paulo. The effect of magnetic disturbances on climate is explained in terms of precipitation of charged particles ionizing the atmosphere;2. The level of rainfalls in Fortaleza show correlation-anticorrelation with the ll, 22 year variations of sunspot numbers during the period of 1860-1990. The different modes of correlations, possibly, could be explained by the fact that one region (São Paulo) is corurected with magnetic lines occupied by inner belt trapped particles and the other one is connected with the empty magnetic lines (Fortaleza). The correlations between the level of rainfalls and cosmic ray flux during Forbush decreases or solar flare flux were not found.