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Nagaraja Rao & Bradley 1983
Nagaraja Rao, C.R. and Bradley, W.A. (1983). Effects of the el chichon volcanic dust cloud on insolation measurements at Corvallis, Oregon (U.S.A.). Geophysical Research Letters 10: doi: 10.1029/GL010i005p00389. issn: 0094-8276.

Insolation measurements made on clear days at Corvallis, Oregon, since the last week of November, 1982, have indicated a decrease of about 14% in the atmospheric clearness index, an increase by a factor of about 2.3 in the ratio of the diffuse sky irradiation to the global irradiation and a decrease of about 28% in the transmittance of the atmosphere for the direct normal solar irradiation compared to the normal, clear-day values. It is felt these anomalies are caused by the increased atmospheric turbidity due to the El Chichon volcanic dust cloud.

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Geophysical Research Letters
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