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The simulated features of heliospheric cosmic-ray modulation with a time-dependent drift model. II - On the energy dependence of the onset of new modulation in 1987
Le Roux, J. A.; Potgieter, M. S.
AA(NASA, Goddard Space Flight Center, Greenbelt; Maryland, University, College Park), AB(NASA, Goddard Space Flight Center, Greenbelt; Maryland, University, College Park)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. 661-667. Research supported by University of Maryland and Department of Environmental Affairs of the Republic of South Africa. (ApJ Homepage)
Publication Date:
Space Radiation
NASA/STI Keywords:
Cosmic Rays, Heliosphere, Neutral Sheets, Solar Corpuscular Radiation, Radial Distribution, Stellar Models, Time Dependence
Bibliographic Code:


Time-dependent heliospheric cosmic-ray modulation for the period 1985-1989 is simulated by means of a time-dependent axially symmetric drift model with an emulated wavy heliospheric neutral sheet (HNS). The model is used to extend previous calculations to other energies in order to study a possible energy-dependence of the onset of new modulation at various radial distances in 1987. The model, with the outward propagating changes of the HNS as the only time-dependent parameters, is found to predict essentially no energy-dependence in the time when new modulation started in the simulated 1987. When a more practical approach in defining 'constant' modulation in 1987 is followed, the present calculations can be interpreted to indicate that the end of the recovery period in 1987 happened progressively earlier and the onset of new modulation progressively later the higher the rigidity of the cosmic rays. This period of relatively unchanged modulation is predicted to last longer with increasing radial distance.

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