Abstract
In this work the onset of the night-to-day phase transition in VLF signals, transmitted from Golfo Nuevo, Argentina (43°S, 65°W) and received at Atibaia, SP (23°S, 46°W), are studied in conjunction with ozone data from a Dobson spectrophotometer operated at Cachoeira Paulista, SP (22°S, 45°W), for the years 1977–1979. Meaningful values of the cross-correlation coefficients for trends of significant number of days, after eliminating the annual variation time series in both sets of data, have been obtained. The superposition of the lag-times of the correlation found for each year reveals a semi-annual variation, which may indicate a meridional transport of ozone in the mesosphere assuming a significant role of the O 3 molecules in the solar UV absorption and perhaps indirectly in the negative ion chemistry of the ionospheric D-region.
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