Twilight optical studies of the El Chichon volcanic dust over Ahmedabad, India

Details Twilight optical studies of the El Chichon volcanic dust over Ahmedabad, India Twilight optical studies of the El Chichon volcanic dust over Ahmedabad, India

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..411a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, May 1984, p. 411-418. Research supported by the Depart

Physics

Optics

3

Atmospheric Optics, Dust, Sky Brightness, Volcanoes, Aerosols, Atmospheric Diffusion, Atmospheric Stratification, India, Twilight Glow

Scientific paper

Following the spectacular twilights associated with the El Chichon volcanic eruption, noticed in Ahmedabad, India since late May 1982, twilight sky brightness measurements were carried out from the same place for about a year between June, 1982, and May, 1983. The measurements made mainly in the near-infrared I band (870 nm) show a novel feature representative of the volcanic aerosol layer in the plot of sky brightness against solar depression. The height of the lower end of the aerosol layer derived from the measurements has remained at about 18 + or - 2 km over a period of about one year. The strength of the aerosol feature, determined by an index Q, shows a gradual decrease suggesting a slow dispersal of the layer with a detectable existence in the I band till the middle of 1984. Multispectral observations indicate that the near-infrared transmission window (2.2 microns) may be a more sensitive indicator of aerosol layer than visible wavelengths.

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