Interplanetary Monitoring Platform (IMP-8) Low-Energy Proton and Electron Differential Energy Analyzer (LEPEDEA) 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.

These experiments were designed to measure the energy spectra of
low-energy electrons and protons in the geocentric range of 30 to 40
earth radii to give further data on geomagnetic storms, aurora, tail
and neutral sheet, and other magnetospheric phenomena. The detectors
were a dual-channel, curved-plate electrostatic analyzer (LEPEDEA -
low energy proton and electron differential energy analyzer) with 16
energy intervals between 5 eV and 50 keV. They had an angular field of
view of 9 x 25 deg. The detectors could be operated in one of two
modes: (1) one providing good angular resolution (16 directions for
each particle energy band) once each 272 s, and (2) the other
providing good temporal resolution in which the entire energy range in
four directions was measured every 68 s.

The data set consists of distribution function and moments data taken
during many magnetotail passes of the IMP 8 spacecraft (at ~200,000
km). The data are at 3-min. resolution.
Other data consists of:
- Color Energy-Time Spectrograms, Digital Images in GIF Format
- Full Color Slides of E-T Spectrograms for Plasma Measurements
- 164 Second Resolution Electron and Proton Plasma Data, CDAW
- Electron and Proton Plasma Data, CDAW
- DigitalProton and Electron Distribution Functions