title: Radiation danger in prolonged manned space flights.
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.
authors.affiliation: Faculty of Physics, University of Sofia, Bulgaria.
authors.forename: A D
authors.initials: AD
authors.lastname: Bonov
mesh_terms: D003359:Cosmic Radiation; D006801:Humans; D011336:Probability; D011835:Radiation Protection; D011853:Radiobiology; D012306:Risk; D019445:Solar Activity; D013026:Space Flight; D014893:Weightlessness