Purpose of the flight and payload description
LEE was an instrument which measured the energy spectrum of comic ray electrons. In the picture at left we can see a scheme of it. It detects incoming electrons with 3 plastic scintillators (T1, T3 and G in the drawing) the last one for anticoincidence and a gas Cherenkov detector (T2). The electron energy is measured in a cesium iodide (T4) and leadglass (T5) calorimeter. Another Scintillator (T6) also assists in particle identification and energy determination by counting the number of particles that escape the calorimeter.
The LEE instrument was developed in the late 60's at the University of Chicago and made his first flight in 1968. Over time, regular ballon flights have been made from Northern Canada every year from 1968 to 1975 and approximately bi-annually until 1979. Then, the experiment was transfered to the University of Delaware, wich now operates it.
The observations obtained by LEE provided very precise measurements of the electron spectrum over an extended period of time.
Details of the balloon flight
- Cosmic-ray electron spectrum and its modulation near solar maximum Journal of Geophysical Research, Volume 77, Issue 19, p. 3295
- Measurements of the Primary Cosmic Ray Electron Spectrum Between 20 MeV and 20 GeV and Its Changes with Time 12th International Conference on Cosmic Rays, 1971. Volume 2., p.548
- Solar modulation of galactic cosmic ray electrons, protons, and alphas Journal of Geophysical Research, vol. 80, May 1, 1975, p. 1701
- The Energy Spectrum of Primary Cosmic Ray Electrons from 20 MeV to 20 GeV in 1968 and 1969 Astrophysical Letters, Vol. 9, p.165
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