AbstractObservations show that the solar wind exhibits two modes of outflow: the slow (∼400kms−1), high density, highly variable wind that emerges from equatorial solar regions, and the high latitude, fast (∼800kms−1), low density, steady solar wind. The bi-modal solar wind outflow is most evident near minima of solar activity. Theoretical studies of the fast solar wind in open magnetic structures motivated by SOHO, Ulysses, and Helios observations indicate that both, high frequency kinetic waves, and low frequency MHD waves play a role in its acceleration and heating. Ion-cyclotron waves have been suggested as the main energy source of the solar wind. However, there are theoretical difficulties with the ion-cyclotron wave heating of the protons, and these waves do not heat electrons. Low frequency MHD waves are still the best candidates to transport momentum and energy far from the Sun, to accelerate the solar wind on large spatial scales. I will present recently developed two-dimensional three-fluid model that includes explicit wave acceleration, and visco-resistive dissipation. The model describes electrons, protons, and minor ions as three coupled fluids that are heated by different heating processes with the parameters constrained by observations. I will present the results of 2.5D three-fluid simulations of the fast solar wind plasma that combine the effects of MHD waves self-consistently, and ion-cyclotron waves parametrically on the acceleration and heating processes. I will present the results of hybrid kinetic models of ion-cyclotron wave heating of the heavy ions in the solar wind plasma.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Wave acceleration of the fast solar wind


    Beteiligte:
    Ofman, Leon (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2005-05-12


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Wave Acceleration of the Fast Solar Wind

    Ofman, L. / COSPAR | British Library Conference Proceedings | 2006


    Wave acceleration of the fast solar wind

    Ofman, Leon | Online Contents | 2006


    Slow and Fast Solar Wind Acceleration Near Solar Maximum

    Breen, A. R. / Thomasson, P. / Jordan, C. A. et al. | British Library Conference Proceedings | 2002


    Solar Wind Acceleration in the Solar Corona

    Giordano, S. et al. | British Library Online Contents | 1997


    A Turbulence Model for Acceleration of the High Latitude Fast Solar Wind

    Verdini, A. / Dmitruk, P. / Matthaeus, W. H. et al. | British Library Conference Proceedings | 2006