Implications for space radiation environment models from CREAM & CREDO measurements over half a solar cycle
| Autor: | C Maag, H.E. Evans, C.J. Watson, P. Knight, Craig Underwood, M. Cosby, C.L. Peerless, R. Noulty, P.R. Truscott, T. Cousins, Clive Dyer |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Linear energy transfer
Space Shuttle Cosmic ray Radiation Dosage Atmospheric sciences Radiation Monitoring Linear Energy Transfer Solar Activity Spacecraft Atlantic Ocean Instrumentation Neutrons Physics Radiation business.industry Spectrum Analysis Photovoltaic system Models Theoretical South America Computational physics South Atlantic Anomaly Solar cycle Solar particle event Protons business Cosmic Radiation |
| Zdroj: | Radiation Measurements. 30:569-578 |
| ISSN: | 1350-4487 |
| DOI: | 10.1016/s1350-4487(99)00236-x |
| Popis: | Flight data obtained between 1990 and 1997 from the Cosmic Radiation Environment Monitors CREAM & CREDO carried on UoSAT-3, Space Shuttle, STRV-1a (Space Technology Research Vehicle) and APEX (Advanced Photovoltaic and Electronics Experiment Spacecraft) provide coverage over half a solar cycle. The modulation of cosmic rays and evolution of the South Atlantic Anomaly are observed, the former comprising a factor of three increase at high latitudes and the latter a general increase accompanied by a north-westward drift. Comparison of particle fluxes and linear energy transfer (LET) spectra is made with improved environment & radiation transport calculations which account for shield distributions and secondary particles. While there is an encouraging convergence between predictions and observations, significant improvements are still required, particularly in the treatment of locally produced secondary particles. Solar-particle events during this time period have LET spectra significantly below the October 1989 event which has been proposed as a worst case model. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect