Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published 1973 | Published
Journal Article Open

Measurements of the Flux of Low-Energy Solar-Flare Positrons


We report new upper limits to the flux of solar-flare positrons in the energy range 0.2 - 2 MeV. The observations were made during four solar-particle events in late 1972, with the Caltech Electron/ Isotope Spectrometer on IMP-7. The 0.2 - 2 MeV positron flux is compared directly to the solar-flare electron (0.2 - 2 MeV) and proton (1.2 - 27.5 MeV) fluxes measured in the same detector system. Summing over four solar events, we find e^+/(e^+ + e^-) < 6 x 10^(- 3). Calculated fluxes of solar-flare positrons for these four events are well below our upper limits.

Additional Information

© 1973 University of Colorado. Provided by the NASA Astrophysics Data System. This work was supported in part by the National Aeronautics and Space Administration under Contract NAS5-11066 and Grant NGR 05-002-160. One of us (Hurford) received support from the National Research Council of Canada while another (Stone) was an Alfred P. Sloan research fellow during this period. Space Radiation Laboratory SRL ID #: 1973-14.

Attached Files

Published - 1973-14.pdf


Files (576.4 kB)
Name Size Download all
576.4 kB Preview Download

Additional details

August 19, 2023
October 26, 2023