Abstract So far, little work has been done to study the effect of merged interaction regions (MIRs) on the long-term modulation of cosmic rays in more complex two-dimensional (2D) simulations of the heliosphere. In order to address this shortcoming we present calculations for protons with a 2D time-dependent drift model with an emulated wavy heliospheric neutral sheet (HNS) which include MIRs as large idealized outward propagating regions of enhanced interplanetary magnetic field (IMF) magnitude. We find the recovery rate (tr) from the MIR induced cosmic-ray intensity decrease to be polarity dependent, being slower during an A < 0 IMF polarity cycle than during an A > 0 cycle. This slower (t r) causes successive MIRs to contribute quantitatively more toward long-term modulation during such cycles, stressing the decisive role (t r) plays in the modulation process. We also expect MIRs to dominate the long-term modulation of cosmic rays relative to the wavy HNS at neutron monitor energies, large radial distances (r), and with effective crossfield diffusion (K ⊥).


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    The simulation of merged interaction regions in the outer heliosphere


    Beteiligte:
    le Roux, J.A. (Autor:in) / Potgieter, M.S. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 13 , 6 ; 251-256


    Erscheinungsdatum :

    01.01.1993


    Format / Umfang :

    6 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    MHD modeling of the outer heliosphere

    Washimi, H. | Elsevier | 1993


    MHD Modeling of the Outer Heliosphere

    Washimi, H. | Online Contents | 1993


    Cosmic-ray gradients in the outer heliosphere

    Kota, J. / Jokipii, J. R. | NTRS | 1993


    Cosmic ray anisotropies in the outer heliosphere

    Ngobeni, M.D. | Online Contents | 2008