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• W4221132804 abstract "The fast solar wind’s high speeds and non-thermal features require that considerable heating occurs well above the Sun’s surface. Two leading theories seem incompatible: low-frequency ‘Alfvénic’ turbulence, which transports energy outwards and is observed ubiquitously by spacecraft but seems insufficient to explain the observed dominance of ion over electron heating; and high-frequency ion-cyclotron waves, which explain the non-thermal heating of ions but lack an obvious source. Here we argue that the recently proposed ‘helicity barrier’ effect, which limits electron heating by inhibiting the turbulent cascade of energy to the smallest scales, can unify these two paradigms. Our six-dimensional simulations show how the helicity barrier causes the large-scale energy to grow through time, generating small parallel scales and high-frequency ion-cyclotron-wave heating from low-frequency turbulence, while simultaneously explaining various other long-standing observational puzzles. The predicted causal link between plasma expansion and the ion-to-electron heating ratio suggests that the helicity barrier could contribute to key observed differences between fast and slow wind streams. The helicity barrier mechanism causes transfer of Alfvénic turbulent energy into ion-cyclotron waves in the solar atmosphere, playing a key role in solar-wind heating and in generating the observed differences between slow and fast solar wind." @default.
• W4221132804 created "2022-04-03" @default.
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• W4221132804 date "2022-03-24" @default.
• W4221132804 modified "2023-10-11" @default.
• W4221132804 title "High-frequency heating of the solar wind triggered by low-frequency turbulence" @default.
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• W4221132804 doi "https://doi.org/10.1038/s41550-022-01624-z" @default.
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