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Published March 15, 1971 | Published
Journal Article Open

Interplanetary Deceleration of Solar Cosmic Rays


Observations of solar-flare proton fluxes of low energies (1-10 MeV) during the 7 June 1969 event have been used to study the effects of energy-change processes on particles propagating in interplanetary space. It is found that the proton energies are decreasing with time at a rate which is consistent with an exponential-decay time constant of 210±10 h. Since adiabatic deceleration in a uniform solar wind would result in a faster decay (78±4 h), additional processes such as Fermi acceleration or a more general deceleration process must be considered.

Additional Information

© 1971 The American Physical Society. Received 25 January 1971. Work supported by the National Aeronautics and Space Administration under Contract No. NAS5-9312 and Grants No. NGR-05-002-160 and No. NGL-05-002-007

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