Solar Modulation of 50-500 Mev Cosmic Ray Electrons and the Electron Spectrum from 1964-1994

Details Solar Modulation of 50-500 Mev Cosmic Ray Electrons and the Electron Spectrum from 1964-1994 Solar Modulation of 50-500 Mev Cosmic Ray Electrons and the Electron Spectrum from 1964-1994

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phdt........18h&link_type=abstract

Thesis (PHD). UNIVERSITY OF DELAWARE , Source DAI-B 59/05, p. 2246, Nov 1998, 268 pages.

Computer Science

5

Scientific paper

Cosmic ray electrons have been directly measured since 1960. Over the last four decades a wealth of data has been collected on these particles, but perhaps none as valuable as the measurements made by the University of Chicago MEH experiment on the ISEE-3/ICE spacecraft and the University of Chicago/Bartol Research Institute Low Energy Electron (LEE) balloon experiment. These data span parts of four solar cycles and cover three solar polarity reversals. The MEH dataset itself has continuous electron coverage spanning seventeen years and two polarity reversals. A new analysis has been done on the MEH dataset to determine the spectrum of electrons with energies from about 30 to 500 MeV and interpret the evolution of the spectrum in the context of the modulation of cosmic electrons over the last four solar cycles. The spectral index for electrons between 30 and 500 MeV was observed to be at all times negative between the years 1979 and 1994. This observation supports recent theoretical calculations that predict fundamental differences between the behavior of electrons and protons at low energies, namely that electrons have a much longer mean free path at low energies than previously assumed. Recent modulation calculations have focused attention on the A-positive solar polarity state, but the compilation of electron spectrum observations and calculations in this work provides a basis for future exploration of the A-negative solar cycle.

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