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- W3099513377 abstract "We present a study of magnetic field fluctuations in a slow solar wind stream, close to ion scales, where an increase of the level of magnetic compressibility is observed. Here, the nature of these compressive fluctuations is found to be characterized by coherent structures. Although previous studies have shown that current sheets can be considered the principal cause of intermittency at ion scales, here we show for the first time that, in the case of the slow solar wind, a large variety of coherent structures contributes to intermittency at proton scales, and current sheets are not the most common. Specifically, we find compressive (), linearly polarized structures in the form of magnetic holes, solitons, and shock waves. Examples of Alfvénic structures () are identified as current sheets and vortex-like structures. Some of these vortices have , as in the case of Alfvén vortices, but the majority of them are characterized by . Thanks to multi-point measurements by the Cluster spacecraft, for about 100 structures we could determine the normal, the propagation velocity, and the spatial scale along this normal. Independently of the nature of the structures, the normal is always perpendicular to the local magnetic field, meaning that k⊥ ≫ k∥. The spatial scales of the studied structures are found to be between two and eight times the proton gyroradius. Most of them are simply convected by the wind, but 25% propagate in the plasma frame. Possible interpretations of the observed structures and the connection with plasma heating are discussed." @default.
- W3099513377 created "2020-11-23" @default.
- W3099513377 creator A5020097045 @default.
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- W3099513377 date "2016-07-29" @default.
- W3099513377 modified "2023-10-13" @default.
- W3099513377 title "COMPRESSIVE COHERENT STRUCTURES AT ION SCALES IN THE SLOW SOLAR WIND" @default.
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