Volcanic eruption plumes on Io

Details Volcanic eruption plumes on Io Volcanic eruption plumes on Io

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.280..733s&link_type=abstract

Nature, vol. 280, Aug. 30, 1979, p. 733-736.

Physics

20

Io, Plumes, Spaceborne Photography, Volcanology, Voyager Project, Albedo, Data Acquisition, Image Processing, Planetology, Ultraviolet Spectroscopy

Scientific paper

Preliminary analyses of the eight volcanic eruption plumes detected on Io by Voyager 1 are presented. Plumes were observed on the bright and dark limbs of the satellite corresponding to half of the surface and range from 10,000 to 75 km in width and 280 to 70 km in height. Most plumes were observed to be umbrella-shaped, however one consists of a very diffuse cloud lacking columnar fountain characteristics. Plume sources are characterized by a dark central area, surrounded by a bright ring, which in turn is surrounded by a broad, diffuse region; the presence of similar markings in regions not observed at the limb indicates additional volcanic activity on Io. No changes were detected in the sizes or intensities of the eruptions over the 6.5-day viewing period, however a change in the appearance of a region near one plume suggests a short-lived eruption between observations. Seven of the eight plumes are located within 30 deg of the equator, implying that equatorial surfaces are generally younger than those in the polar regions.

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