Energy transfer, discontinuities and heating in the inner solar wind measured with a weak and local formulation of the Politano-Pouquet law
crossref(2022)
摘要
<div> <div> <div> <p>The solar wind is a highly turbulent plasma for which the mean rate of energy transfer ε has been measured for a long time using the Politano-Pouquet (PP98) exact law. However, this law assumes statistical homogeneity that can be violated by the presence of discontinuities. Here, we introduce a new method based on the inertial dissipation D<sub>I</sub> whose analytical form is derived from incompressible magnetohydrodynamics (MHD); it can be considered as a weak and local (in space) formulation of the PP98 law whose expression is recovered after integration is space. We used D<sub>I</sub> to estimate the local energy transfer rate from the THEMIS-B and Parker Solar Probe (PSP) data taken in the solar wind at different heliospheric distances. Our study reveals that discontinuities near the Sun lead to a strong energy transfer that affects a wide range of scales σ. We also observe that switchbacks seem to be characterized by a singular behavior with an energy transfer varying as σ<sup>−3/4</sup>, which slightly differs from classical discontinuities characterized by a σ<sup>−1</sup> scaling. A comparison between the measurements of ε and D<sub>I</sub> shows that in general the latter is significantly larger than the former.</p> <p>https://arxiv.org/pdf/2201.02377.pdf</p> </div> </div> </div>
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