TitleION-SCALE TURBULENCE IN THE INNER HELIOSPHERE: RADIAL DEPENDENCE
Publication TypeJournal Article
Year of Publication2015
Authorsel, Ḩ, Motschmann, U, üchner, J, Narita, Y, Nariyuki, Y
JournalThe Astrophysical Journal
Volume812
Issue2
Pagination175
Date Published10/2015
Keywordsparker solar probe; plasmas; Solar Probe Plus; Solar wind; turbulence; waves
Abstract

The evolution of the ion-scale plasma turbulence in the inner heliosphere is studied by associating the plasma parameters for hybrid-code turbulence simulations to the radial distance from the Sun via a Solar wind model based mapping procedure. Using a mapping based on a one-dimensional solar wind expansion model, the resulting ion-kinetic scale turbulence is related to the solar wind distance from the Sun. For this purpose the mapping is carried out for various values of ion beta that correspond to the heliocentric distance. It is shown that the relevant normal modes such as ion cyclotron and ion Bernstein modes will occur first at radial distances of about 0.2-0.3 AU, i.e., near the Mercury orbit. This finding can be used as a reference, a prediction to guide the in situ measurements to be performed by the upcoming Solar Orbiter and Solar Probe Plus missions. Furthermore, a radial dependence of the wave-vector anisotropy was obtained. For astrophysical objects this means that the spatial scales of filamentary structures in interstellar media or astrophysical jets can be predicted for photometric observations.

URLhttp://stacks.iop.org/0004-637X/812/i=2/a=175?key=crossref.a9d511ae127248e735f11254de6e3bb9
DOI10.1088/0004-637X/812/2/175
Short TitleApJ


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