Time Serial Analysis of the Induced LEO Environment within the ISS 6AAnisotropies in the low Earth orbit (LEO) radiation environment were found to influence the thermoluminescence detectors (TLD) dose within the (International Space Station) ISS 7A Service Module. Subsequently, anisotropic environmental models with improved dynamic time extrapolation have been developed including westward and northern drifts using AP8 Min & Max as estimates of the historic spatial distribution of trapped protons in the 1965 and 1970 era, respectively. In addition, a directional dependent geomagnetic cutoff model was derived for geomagnetic field configurations from the 1945 to 2020 time frame. A dynamic neutron albedo model based on our atmospheric radiation studies has likewise been required to explain LEO neutron measurements. The simultaneous measurements of dose and dose rate using four Liulin instruments at various locations in the US LAB and Node 1 has experimentally demonstrated anisotropic effects in ISS 6A and are used herein to evaluate the adequacy of these revised environmental models.
Document ID
20060051805
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Wilson, John W. (NASA Langley Research Center Hampton, VA, United States)
Nealy, John E. (Old Dominion Univ. Norfolk, VA, United States)
Tomov, B. T. (Bulgarian Academy of Sciences Sofia, Bulgaria)
Cucinotta, Francis A. (NASA Johnson Space Center Houston, TX, United States)
Badavi, Frank F. (Christopher Newport Univ. Newport News, VA, United States)
DeAngelis, Giovanni (Old Dominion Univ. Norfolk, VA, United States)
Atwell, William (Boeing Co. Houston, TX, United States)
Leutke, N. (Swales Aerospace Hampton, VA, United States)