uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Magnetic turbulence in space plasmas: Scale-dependent effects of anisotropy
Show others and affiliations
2009 (English)In: Journal of Geophysical Research, ISSN 0148-0227, Vol. 114, A02102- p.Article in journal (Refereed) Published
Abstract [en]

The presence of a background magnetic field induces anisotropy in magnetic turbulence. Understanding properties of anisotropy is important to characterize turbulence power spectrum. This paper presents a case study of anisotropy by using a minimum variance analysis, in three different regions of the heliosphere, namely in the solar wind, and in the Earth's foreshock and magnetosheath behind a quasiparallel bow shock. A strong anisotropy is found in all cases, with very interesting cross-scale effects at the ion cyclotron frequency. In particular, (1) the eigenvalues of the variance matrix have a strong intermittent behavior, with very high localized fluctuations below the ion cyclotron scale. As a consequence the probability distribution functions are almost Gaussian5 above the ion cyclotron scale and become power laws at smaller scales; (2) the minimum variance direction is almost parallel to the background magnetic field at scales larger than the ion cyclotron scale in the solar wind and in the foreshock, while their probability density functions become broader at smaller scales. In the magnetosheath the minimum variance direction exhibits a tendency to become nearly perpendicular to the large-scale magnetic field below the ion cyclotron scale.

Place, publisher, year, edition, pages
2009. Vol. 114, A02102- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-148780DOI: 10.1029/2008JA013491ISI: 000263179300005OAI: oai:DiVA.org:uu-148780DiVA: diva2:402961
Available from: 2011-03-10 Created: 2011-03-10 Last updated: 2011-03-10Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text
By organisation
Swedish Institute of Space Physics, Uppsala Division
In the same journal
Journal of Geophysical Research
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 164 hits
ReferencesLink to record
Permanent link

Direct link