Updated measurements from CREAM & CREDO & implications for environment & shielding models.
Flight data obtained between 1995 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) have been added to the dataset affording coverage since 1990. The modulation of cosmic rays and evolution of the South Atlantic Anomaly are observed, the former comprising a factor three increase at high latitudes and the latter a general increase accompanied by a westward drift. Comparison of particle fluxes and linear energy transfer 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 treatrnent of locally produced secondary particles.
Dyer
C S
CS
Space Department, DERA Farnborough, England.
Truscott
P R
PR
Peerless
C L
CL
Watson
C J
CJ
Evans
H E
HE
Knight
P
P
Cosby
M
M
Underwood
C
C
Cousins
T
T
Noulty
R
R
D001267:Atlantic Ocean; D003359:Cosmic Radiation; D003627:Data Interpretation, Statistical; D018499:Linear Energy Transfer; D009502:Neutrons; D011522:Protons; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000295:instrumentation*; D011835:Radiation Protection; D019445:Solar Activity; D013020:South America; D013026:Space Flight / Q000295:instrumentation*; D018531:Spacecraft / Q000295:instrumentation
D011522:Protons