Interplanetary Monitoring Platform (IMP-8) Charged Particle Measurement Experiment (CPME) Data

IMP-8 (IMP-J) was launched by NASA on October 26, 1973 to measure the
magnetic fields, plasmas, and energetic charged particles (e.g.,
cosmic rays) of the Earth's magnetotail and magnetosheath and of the
near-Earth solar wind. IMP-8 continues to operate.

The Charged Particle Measurement Experiment (CPME) on IMP-8 provide
text-formatted data files containing energetic ion and electron count
rates and fluxes that cover a wide variety of ion species, energy
ranges, angular distributions, and time resolutions.
EPE data at JHU/APL consists of:
- 32-Day Hourly-Average Plots Organized by Solar Cycle
- plots of 5.5-minute and 1-hour averaged intensities
- text files of 5.5-minute, 1-hour, and 1-day averaged intensities
and count rates
- Merged data with the IMP-8 Energetic Particle Experiment (EPE)

Data at NSSDC consists of:
- Reduced Data Files Containing Count Rates of all Detectors
- Hourly Proton Flux 1,2,4,10,30,60 MeV Data
- Survey Plots of all Detectors, 24-Hours of Data Per Plot, on
Microfilm
- Daily Averaged Fluxes
- 20-s CPME + EPE Particle, 15-s Magnetic Field and 1-min Plasma
Merged Data Set
- Daily Averaged Proton Fluxes Greater than 10, 30, 60 MeV
- Daily Averaged Flux Plots on Microfiche
- Hourly Averaged 1-2, 14-25 MeV Proton Flux Data
- Energetic Electrons and Protons Data
- Hourly Averaged 1-2 and 14-25 MeV Proton Flux Data