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On the Interpretation of Magnetic Helicity Signatures in the Dissipation Range of Solar Wind Turbulence
Journal article   Open access   Peer reviewed

On the Interpretation of Magnetic Helicity Signatures in the Dissipation Range of Solar Wind Turbulence

Gregory G Howes and Eliot Quataert
Astrophysical journal. Letters, Vol.709(1), pp.L49-L52
10/26/2009
DOI: 10.1088/2041-8205/709/1/L49
url
https://doi.org/10.1088/2041-8205/709/1/L49View
Published (Version of record) Open Access

Abstract

Measurements of small-scale turbulent fluctuations in the solar wind find a non-zero right-handed magnetic helicity. This has been interpreted as evidence for ion cyclotron damping. However, theoretical and empirical evidence suggests that the majority of the energy in solar wind turbulence resides in low frequency anisotropic kinetic Alfven wave fluctuations that are not subject to ion cyclotron damping. We demonstrate that a dissipation range comprised of kinetic Alfven waves also produces a net right-handed fluctuating magnetic helicity signature consistent with observations. Thus, the observed magnetic helicity signature does not necessarily imply that ion cyclotron damping is energetically important in the solar wind.

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