Abstract
Sporadic E layer behavior over Cachoeira Paulista (11°57′S, 22°32′E geomagnetic coordinates), located near the center of the Brazilian Geomagnetic Anomaly, is investigated during magnetically disturbed periods. Significant enhancements in the Es layer parameters, ftEs and fbEs take place for short periods (2–3 hours) following a magnetic disturbance of moderate intensity. The enhancements, however, are delayed by 1–3 days with respect to the initiation of a disturbance. The electron density enhancement in the Es layer inferred from fbEs during such events are at times an order of magnitude larger than undisturbed values. Also, during some night events the ambient E region electron densities appear comparable to the regular daytime maximum values. The Es traces in the ionograms during these events exhibit range spread in the echoes resembling the a-type Es, know to occur over auroral latitudes under disturbed conditions. These results are interpreted as evidence of enhanced charged particle precipitation in the E region over the geomagnetic anomaly following magnetic disturbances. The results also provide evidence that the E region response over our station is delayed with respect to magnetic activity.
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