[Beeck 1987 a]
A multispacecraft study of the injection and transport of solar energetic
particles
J. Beeck, G. M. Mason, D. C. Hamilton,
G. Wibberenz, H. Kunow, D. Hovestadt and B. Klecker.
A multispacecraft study of the injection and transport of solar energetic
particles.
Astrophysical Journal, Part 1, 322, 1052-1072. 1987
Contents
The November 22, 1977 and December 27, 1977 solar energetic particle
(SEP) events observed simultaneously by the Helios and the Voyager space probes
and the ISEE 1 satellite are described.
The spacecraft instruments indicated flux increases for H, He, and (for
November 22) for O and Fe, with the energy range of 0.5-20 MeV per
nucleon.
It was found that the data can be well fitted by a model based on the
spherically symmetric Fokker-Planck equation including convection, diffusion
and adiabatic deceleration, assuming that the radial interplanetary diffusion
coefficient increases in proportion to the heliocentric radius to the power of
0.6 and that there is an extended particle injection at the sun.
This extended injection is of crucial importance for the event of
November 22, where the injection functions are strongly dependent on times
associated with a soft energy spectrum.
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