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| Titel |
Spatial transport and spectral transfer of solar wind turbulence composed of Alfvén waves and convective structures I: The theoretical model |
| VerfasserIn |
J. M. Schmidt, E. Marsch |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 13, no. 5 ; Nr. 13, no. 5, S.459-474 |
| Datensatznummer |
250011845
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| Publikation (Nr.) |
 copernicus.org/angeo-13-459-1995.pdf |
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| Zusammenfassung |
| In this paper we give a survey of detailed
algebraic developments of a solar wind turbulence model. The numerical solution
of the coupled system of spectral transfer equations for turbulence composed of
Alfvén waves and convective structures or two-dimensional turbulence is
prepared. The underlying theory of spectral transfer equations was established
by several authors in the early 1990s. The related numerical turbulence model
which is elaborated in detail in this paper is based on a rotationally symmetric
solar wind model for the background magnetic and flow velocity fields with the
full geometry of Parker's spiral which has to be inserted into the transfer
equations. Various sources and sinks for turbulent energy are included and
appropriately modelled analytically. Spherical expansion terms related to radial
gradients of the background velocity fields are considered as far as possible
within a rotational symmetric solar wind model, which excludes vorticity
effects. Furthermore, nonlinear interaction terms are considered, justified by
phenomenological arguments and evaluated by dimensional analysis. Moreover,
parametric conversion terms for Alfvén waves and wave-structure interactions
are modelled and a generalized spectral flux function for the residual energy eR
is introduced. In addition, we compensate the spectra for WKB trends and f -5/3-slopes
in order to prepare a convenient form of the equations for numerical treatment.
The modelling of source and sink terms includes a special analytical treatment
for correlation tensors. This first part presents a summary of the main ideas
and the special approximations used for all these terms, together with details
on the basic steps of the algebraic calculations. The description of the
numerical scheme and a survey of the numerical results of our model, as well as
a discussion of the main physical results are contained in a companion paper. |
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