Physics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..785m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, Aug. 1986, p. 785-788.
Physics
8
Energetic Particles, Galactic Cosmic Rays, Heliosphere, Interplanetary Medium, Energy Spectra, Helium, Hydrogen, Kinetic Energy, Long Term Effects, Particle Energy
Scientific paper
Energetic hydrogen and helium nuclei from the galaxy (cosmic rays) enter the solar system with varying degrees of difficulty during the 11-year solar magnetic cycle, resulting in spatial and temporal variations of particle intensities in the heliosophere. Observations of these variations from the ISEE-3, Voyager 1 and 2, and Pioneer 10 spacecraft during the period from early 1981 to early 1986 and for heliocentric distances ranging from 1 to 37 AU are reported. During this time the high energy intensities in the outer heliosphere have been increasing exponentially at a rate of approximately 20 percent/year with occasional interruptions due to enhanced solar activity. The radial intensity gradients measured in the ecliptic plane are observed to remain constant or to decrease at the time of the reversal of the solar magnetic poles in 1980.
Lal Niranjan
McDonald Frank B.
Schuster Philip
Trainor James H.
von Rosenvinge Tycho T.
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