Abstract Observations of solar cosmic ray events far from the sun (⪢1 AU) became possible after the launch of Pioneer 10 in 1972. Four spacecraft have now travelled beyond the orbit of Jupiter - Pioneer 10/11 and Voyager 1/2 — and are producing a growing body of distant observations of solar cosmic ray events. Initial studies using Pioneer 10/11 data out to ∼6 AU interpreted flare particle observations in terms of a diffusion model, including the effects of convection and adiabatic energy loss. This model enjoyed general success in explaining the time-intensity profiles in cases where the spacecraft connection longitude at the sun did not change significantly with time. The results implied that the radial diffusion coefficient (Kr) increased slowly with distance over that radial range. More recent results at larger distances imply that Kr may begin to decrease beyond ∼5 AU. It is not yet clear whether the standard diffusion model will be adequate to explain solar events well beyond 5 AU. The fact that large events at very large distances can last up to two solar rotations implies that solar wind stream structure will also play a role in the event dynamics. In general, however, observations at large distances offer perhaps the best hope of separating interplanetary propagation effects from coronal storage and propagation effects which frequently dominate observed event profiles at 1 AU.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Dynamics of solar cosmic ray events: Processes at large heliocentric distances (⪢1 AU)


    Beteiligte:
    Hamilton, D.C. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1981-01-01


    Format / Umfang :

    16 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Dust emission of Comet Halley at large heliocentric distances

    Gruen, E. / Schwehm, G. / Massonne, L. et al. | NTRS | 1985


    Solar Sail Simplified Optimal Control Law for Reaching High Heliocentric Distances

    Caruso, Andrea / Niccolai, Lorenzo / Quarta, Alessandro A. et al. | Springer Verlag | 2021


    Solar Sail Heliocentric Earth-Following Orbits

    Heiligers, Jeannette / McInnes, Colin R. | AIAA | 2015


    Solar Sail Heliocentric Elliptic Displaced Orbits

    Gong, Shengping / Li, Junfeng | AIAA | 2014


    Solar Sail Heliocentric Earth-Following Orbits

    Jeannette Heiligers | Online Contents | 2015