Cosmic-ray positron and negatron spectra between 20 and 800 MeV measured in 1974

Details Cosmic-ray positron and negatron spectra between 20 and 800 MeV measured in 1974 Cosmic-ray positron and negatron spectra between 20 and 800 MeV measured in 1974

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204..927h&link_type=abstract

Astrophysical Journal, vol. 204, Mar. 15, 1976, pt. 1, p. 927-933.

Astronomy and Astrophysics

Astrophysics

21

Abundance, Cosmic Rays, Magnetic Spectroscopy, Negatrons, Particle Flux Density, Positrons, Balloon-Borne Instruments, Diffusion Coefficient, Galactic Radiation, Particle Diffusion, Solar Activity Effects

Scientific paper

The flux density of cosmic-ray positrons and electrons was measured by a balloon-borne spark chamber magnetic spectrometer in two flights in an attempt to study the solar modulation of galactic cosmic rays. The total electron flux was found to be about 0.03/cu m/s/sr/MeV between 70 and 800 MeV and to increase toward lower energies, while the positron flux decreased sharply toward lower energies from about 0.008/cu m/s/sr/MeV at 650 MeV and only upper limits were obtained for positrons below 200 MeV. At energies above 180 MeV, the spherically symmetrical Fokker-Planck equation with a diffusion coefficient proportional to the particle rigidity provided a reasonable fit to both positron and total electron data, while at energies below 180 MeV, the data were consistent with a continuation of the same diffusion coefficient and local source of electrons, or a change in the diffusion coefficient to a constant value.

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