TY - RPRT TI - Solar Cycle Variation and Application to the Space Radiation Environment AU - Wilson, John W. AU - Kim, Myung-Hee Y. AU - Shinn, Judy L. AU - Tai, Hsiang AU - Cucinotta, Francis A. AU - Badhwar, Gautam D. AU - Badavi, Francis F. AU - Atwell, William PY - 1999 UR - https://ntrs.nasa.gov/citations/19990070313 ID - 19990070313 ER -