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

Direct link
Evidence of a Cascade and Dissipation of Solar-Wind Turbulence at the Electron Gyroscale
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
2009 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 102, no 23, 231102- p.Article in journal (Refereed) Published
Abstract [en]

We report the first direct determination of the dissipation range of magnetofluid turbulence in the solar wind at the electron scales. Combining high resolution magnetic and electric field data of the Cluster spacecraft, we computed the spectrum of turbulence and found two distinct breakpoints in the magnetic spectrum at 0.4 and 35 Hz, which correspond, respectively, to the Doppler-shifted proton and electron gyroscales, f(rho p) and f(rho e). Below f(rho p), the spectrum follows a Kolmogorov scaling f(-1.62), typical of spectra observed at 1 AU. Above f(rho p), a second inertial range is formed with a scaling f(-2.3) down to f(rho e). Above f(rho e), the spectrum has a steeper power law similar to f(-4.1) down to the noise level of the instrument. We interpret this as the dissipation range and show a remarkable agreement with theoretical predictions of a quasi-two-dimensional cascade into Kinetic Alfveacuten Waves (KAW).

Place, publisher, year, edition, pages
2009. Vol. 102, no 23, 231102- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-148317DOI: 10.1103/PhysRevLett.102.231102ISI: 000266977500012OAI: oai:DiVA.org:uu-148317DiVA: diva2:402116
Available from: 2011-03-07 Created: 2011-03-04 Last updated: 2011-03-07Bibliographically 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
Physical Review Letters
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: 178 hits
ReferencesLink to record
Permanent link

Direct link