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Three-dimensional spatial structures of solar wind turbulence from 10 000-km to 100-km scales

Narita, Y. und Glassmeier, K.H. und Goldstein, M.L. und Motschmann, U. und Sahraoui, F. (2011) Three-dimensional spatial structures of solar wind turbulence from 10 000-km to 100-km scales. Annales Geophysicae, 29, Seiten 1731-1738. DOI: 10.5194/angeo-29-1731-2011.

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Kurzfassung

Using the four Cluster spacecraft, we have determined the three-dimensional wave-vector spectra of fluctuating magnetic fields in the solar wind. Three different solar wind intervals of Cluster data are investigated for this purpose, representing three different spatial scales: 10 000 km, 1000 km, and 100 km. The spectra are determined using the wave telescope technique (k-filtering technique) without assuming the validity of Taylor�s frozen-in-flow hypothesis nor are any assumptions made as to the symmetry properties of the fluctuations. We find that the spectra are anisotropic on all the three scales and the power is extended primarily in the directions perpendicular to the mean magnetic field, as might be expected of two-dimensional turbulence, however, the analyzed fluctuations are not axisymmetric. The lack of axisymmetry invalidates some earlier techniques using single spacecraft observations that were used to estimate the percentage of magnetic energy residing in quasitwo- dimensional power. However, the dominance of twodimensional turbulence is consistent with the relatively long mean free paths of cosmic rays in observed in the heliosphere. On the other hand, the spectra also exhibit secondary extended structures oblique from the mean magnetic field direction. We discuss possible origins of anisotropy and asymmetry of solar wind turbulence spectra.

Dokumentart:Zeitschriftenbeitrag
Titel:Three-dimensional spatial structures of solar wind turbulence from 10 000-km to 100-km scales
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Narita, Y.Institut für Geophysik und Meteorologie, TU Braunschweig, Germany
Glassmeier, K.H.Institut für Geophysik und Meteorologie, TU Braunschweig, Germany
Goldstein, M.L.Geospace Physics Laboratory, Code 673, Goddard Space Flight Center, Greenbelt, MD 20771, USA
Motschmann, U.uwe.motschmann@dlr.de
Sahraoui, F.Laboratoire de Physique des Plasmas Observatoire de Saint-Maur, 4 avenue de Neptune, 94107 Saint-Maur-Des-Foss´es,
Datum:2011
Erschienen in:Annales Geophysicae
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:29
DOI :10.5194/angeo-29-1731-2011
Seitenbereich:Seiten 1731-1738
Status:veröffentlicht
Stichwörter:Interplanetary physics (Interplanetary magnetic fields; MHD waves and turbulence; Plasma waves and turbulence)
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Planetenforschung (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Asteroiden und Kometen
Hinterlegt von: Susanne Pieth
Hinterlegt am:10 Jan 2012 10:02
Letzte Änderung:12 Dez 2013 21:31

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