Journal
EPL
Volume 81, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/81/36002
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Funding
- Engineering and Physical Sciences Research Council [EP/D040892/1] Funding Source: researchfish
- EPSRC [EP/D040892/1] Funding Source: UKRI
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We discuss a recent experiment in which the spectrum of the vortex line density fluctuations has been measured in superfluid turbulence. The observed frequency dependence of the spectrum, f(-5/3), disagrees with classical vorticity spectra if, following the literature, the vortex line density is interpreted as a measure of the vorticity or enstrophy. We argue that the disagrement is solved if the vortex line density field is decomposed into a polarised field (which carries most of the energy) and an isotropic field (which is responsible for the spectrum). Copyright (C) EPLA, 2008.
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