Role of sulphur photochemistry in tropical ozone changes after the eruption of Mount Pinatubo

Details Role of sulphur photochemistry in tropical ozone changes after the eruption of Mount Pinatubo Role of sulphur photochemistry in tropical ozone changes after the eruption of Mount Pinatubo

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.362..331b&link_type=abstract

Nature (ISSN 0028-0836), vol. 362, no. 6418, p. 331-333.

Computer Science

31

Atmospheric Chemistry, Ozone, Photochemical Reactions, Stratosphere, Sulfur Dioxides, Volcanoes, Aerosols, Total Ozone Mapping Spectrometer, Tropical Regions

Scientific paper

The formation of spiral structure in a galaxy, as a result of the gravitational perturbation caused by a permanent companion, is studied. It is found that spiral structure appears only when a resonance exists between the rotational frequency of the stars in the galaxy and the rotational frequency of the companion galaxy. The number of spiral arms depends strongly on the particular resonance. In the case where the companion moves in an elliptic orbit, spiral arms are formed when a resonance, inside the galactic body, exists in almost all the parts of the orbit or, at least, in the largest part of it.

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