Physics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3375d&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3375-3379.
Physics
12
Current Sheets, Energetic Particles, Galactic Cosmic Rays, Heliosphere, Interplanetary Magnetic Fields, Solar Rotation, Imp, Interplanetary Medium, Solar Flares, Solar System, Solar Wind Velocity, Voyager Project
Scientific paper
The authors report a measurement of a sustained latitudinal gradient of 70-MeV galactic cosmic ray protons using data from the interplanetary probes Voyager 1 and 2 and the earth-orbiting satellite IMP 8 during a 1-year period from mid-1985 to mid-1986. They determine an average latitudinal gradient during this period of (-0.53±0.10)% deg-1 or (-0.38±0.11)% deg-1 (i.e., intensity decreasing northward of the solar equatorial plane), assuming either a constant radial gradient or one that decreased at an average rate of -0.025% AU-1, as was the case during 1984, respectively. In addition, the authors present Voyager data at very low (⪆30 keV) ion energies which are associated with acceleration at corotating shocks. These ions also exhibit a latitudinal gradient (≡ -3% deg-1), with lower intensities at higher latitudes, and serve to highlight changes that occurred in the interplanetary medium in early 1985.
Decker Robert B.
Krimigis Stamatios M.
Venkatesan D.
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