Abstract
We have observed an unusual behaviour in the twilight sky brightness in the near IR region associated with volcanic dust from the EI Chichón eruption in Mexico. Approximately 8 min after sunset the sky brightness increases with time for about 8–10 min in the I band (γeff = 0.87 µm). This may be explained by a variation in the extinction of the illuminating solar radiation during its passage through the aerosol layer before being scattered into the observer's line of sight. Here, we estimate a mean height of 22 km, a thickness of 10 km and a drift speed of 19 km h−1 for the layer over Ahmedabad in June 1982.
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Ashok, N., Bhatt, H., Chandrasekhar, T. et al. Twilight IR brightening over India due to EI Chichón's eruption in Mexico. Nature 300, 620–621 (1982). https://doi.org/10.1038/300620a0
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DOI: https://doi.org/10.1038/300620a0
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