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- W3082608711 abstract "<p>The first two orbits of the Parker Solar Probe (PSP) spacecraft have enabled the first in situ measurements of the solar wind down to a heliocentric distance of 0.17 au (or 36 Rs). Here, we present an analysis of this data to study solar wind turbulence at 0.17 au and its evolution out to 1 au. While many features remain similar, key differences at 0.17 au include: increased turbulence energy levels by more than an order of magnitude, a magnetic field spectral index of -3/2 matching that of the velocity and both Elsasser fields, a lower magnetic compressibility consistent with a smaller slow-mode kinetic energy fraction, and a much smaller outer scale that has had time for substantial nonlinear processing. There is also an overall increase in the dominance of outward-propagating Alfvenic fluctuations compared to inward-propagating ones, and the radial variation of the inward component is consistent with its generation by reflection from the large-scale gradient in Alfven speed. The energy flux in this turbulence at 0.17 au was found to be ~10% of that in the bulk solar wind kinetic energy, becoming ~40% when extrapolated to the Alfven point, and both the fraction and rate of increase of this flux towards the Sun is consistent with turbulence-driven models in which the solar wind is powered by this flux.</p>" @default.
- W3082608711 created "2020-09-08" @default.
- W3082608711 creator A5004976391 @default.
- W3082608711 date "2020-03-23" @default.
- W3082608711 modified "2023-09-25" @default.
- W3082608711 title "The Evolution and Role of Solar Wind Turbulence in the Inner Heliosphere" @default.
- W3082608711 doi "https://doi.org/10.5194/egusphere-egu2020-11550" @default.
- W3082608711 hasPublicationYear "2020" @default.
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