Multipoint observation of anisotropy and intermittency in solar-wind turbulence

Yordanova, Emiliya (author): Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen

Perri, S. (author)

Sorriso-Valvo, L. (author)

Carbone, V. (author)

(creator_code:org_t)

2015-04-17
2015
English.
In: Europhysics letters. - : IOP Publishing. - 0295-5075 .- 1286-4854. ; 110:1

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

Using high-resolution magnetic-field Cluster observations, we have investigated the magnetic-field anisotropy via the second-and fourth-order structure functions over a wide range of scales reaching below the subproton scale. The magnetic-field increments have been computed from single-and two-spacecraft measurements. The two-satellite technique allows us to study the increments as a function of an actual space lag. Both single-and two-point analyses show that the magnetic field is anisotropic even at small time/spatial scales. The single-spacecraft data also shows that the degree of anisotropy does not change with the scale at proton and subproton scales. It is also pointed out that the degree of magnetic-field anisotropy tends to be overestimated in the single-spacecraft data analysis. This is particularly evident at small scales and it depends on the angle between the spacecraft separation and the flow direction. From the fourth-order moment of the probability density function of the magnetic-field increments we have also investigated the presence of intermittency in the fluctuations. Even though to a different degree, intermittency was present over the entire range of scales, with an indication of scale invariance at subproton scales.

By the author/editor: Yordanova, Emili ...; Perri, S.; Sorriso-Valvo, L ...; Carbone, V.

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Fusion Plasma an ...

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