Interplanetary Deceleration of Solar Cosmic Rays

Details Interplanetary Deceleration of Solar Cosmic Rays Interplanetary Deceleration of Solar Cosmic Rays

Mar 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971phrvl..26..663m&link_type=abstract

Physical Review Letters, vol. 26, Issue 11, pp. 663-666

Physics

12

Scientific paper

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.

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