PMID: 11902169Oct 1, 1979Paper

Radiation danger in prolonged manned space flights

Acta Astronautica
A D Bonov

Abstract

The author examines methods for prognosticating solar activity for several decades to determine optimum periods for prolonged space flight. The focus of the discussion is the presence of a change in magnetic polarity at the beginning of each 11-year solar cycle, resulting in a 22-year cycle. An historical review of solar cycles determined a super cycle of about 180 years. Using this data, it is determined that solar activity will be weak through the end of the 20th century.

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