Abstract
During the period July 14–September 11, 1973, about 25 000 television pictures of Mars were obtained using a 0.7m telescope in ten spectral regions. A dust storm in moderate latitudes was recorded. It started before Mars passed perigee. During the observation period the atmosphere was gradually clearing. About 3000 pictures of Mars were taken using a 0.5m meniscus telescope during the period of Nobember 19, 1973–February 19, 1974. On November 19 the atmosphere was very hazy and heavy dust clouds were recorded. The second dust storm cleared during December through January.
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