Physics
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.4817b&link_type=abstract
Journal of Geophysical Research, vol. 103, p. 4817
Physics
12
Cosmic Rays, Albedo, Antimatter, Balloon-Borne Instruments, New Mexico, Monte Carlo Method, Computerized Simulation
Scientific paper
The High-Energy Antimatter Telescope (HEAT) balloon cosmic ray detector flew from Fort Sumner, New Mexico on May 3-5, 1994. The instrument measured electron and positron abundances and spectra from about 1 to 100 GeV at a vertical geomagnetic cutoff rigidity that varied between 4.0 and 4.5 GV. The intensities of electrons and positrons have been measured as a function of atmospheric depth between 3.8 and 7.4 g/sq cm of overburden. At magnetic rigidities below cutoff, the intensity of downward moving e(+/-) consists of secondary (spallogenic) particles and the reentrant (or return) albedo. We determine the contribution of the reentrant electron albedo and compare it with earlier measurements and limits at similar geomagnetic cutoff levels. In the range of 1.0-2.4 GeV, the reentrant albedo component amounts to 40 percent of the total electron intensity observed.
Barwick Steve W.
Beatty James J.
Bower Charles R.
Chaput Christopher James
Coutu Stephane
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