Pioneer 11 Trapped Radiation Detector (TRD) 1-Hour Count Rates

Hourly count rates from UCSD Trapped Radiation Detector (TRD) carried on Pioneer 11. Included are four rates, C1 and C3 from the Cerenkov counter and M1L and M3L from the Minimum Ionizing Particle Counter. C1 corresponds to >480 MeV/n ions (typically 80% protons and 20% Z>1 nuclei). C3 corresponds to >650 MeV/n ions (typically 30% protons and 70% Z>1 nuclei). M1L corresponds to >80 MeV/n ions (typically 90% protons and 10% Z>1 nuclei). M3L corresponds to 80-300 MeV protons (50%) and >80 MeV/n Z>1 nuclei (50%). The data are ftp-accessible in annual ASCII files and via FTPBrowser. The hourly averages were computed at NSSDC from 30-min data still offline (as of Feb. 2009).