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The Evolution and Role of Solar Wind Turbulence in the Inner Heliosphere

Chen, C. H. K. ; Bale, S. D. ; Bonnell, J. W. ; Borovikov, D. ; Bowen, T. A. ; Burgess, D. ; Case, A. W. ; Chandran, B. D. G. ; de Wit, T. Dudok ; Goetz, K. ; Harvey, P. R. ; Kasper, J. C. ; Klein, K. G. ; Korreck, K. E. ; Larson, D. ; Livi, R. ; MacDowall, R. J. ; Malaspina, D. M. ; Mallet, A. ; McManus, M. D. ; Moncuquet, M. ; Pulupa, M. ; Stevens, M. L. ; Whittlesey, P.

The Astrophysical journal. Supplement series, 2020-02, Vol.246 (2), p.53 [Periódico revisado por pares]

Saskatoon: The American Astronomical Society

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Título:
The Evolution and Role of Solar Wind Turbulence in the Inner Heliosphere
Autor: Chen, C. H. K. ; Bale, S. D. ; Bonnell, J. W. ; Borovikov, D. ; Bowen, T. A. ; Burgess, D. ; Case, A. W. ; Chandran, B. D. G. ; de Wit, T. Dudok ; Goetz, K. ; Harvey, P. R. ; Kasper, J. C. ; Klein, K. G. ; Korreck, K. E. ; Larson, D. ; Livi, R. ; MacDowall, R. J. ; Malaspina, D. M. ; Mallet, A. ; McManus, M. D. ; Moncuquet, M. ; Pulupa, M. ; Stevens, M. L. ; Whittlesey, P.
Assuntos: Alfven waves ; Astrophysics ; Compressibility ; Energy flux ; Energy levels ; Evolution ; Fluctuations ; Flux ; Heliosphere ; In situ measurement ; Interplanetary magnetic fields ; Interplanetary turbulence ; Kinetic energy ; Magnetic fields ; Physics ; Plasma astrophysics ; Sciences of the Universe ; Solar and Stellar Astrophysics ; Solar energy ; Solar power ; Solar probes ; Solar wind ; Solar wind turbulence ; Space Physics ; Space plasmas ; Spacecraft ; The Sun ; Turbulence
É parte de: The Astrophysical journal. Supplement series, 2020-02, Vol.246 (2), p.53
Notas: The Sun and the Heliosphere
AAS20555
Descrição: The first two orbits of the Parker Solar Probe spacecraft have enabled the first in situ measurements of the solar wind down to a heliocentric distance of 0.17 au (or 36 ). 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 Alfvénic 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 Alfvén 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 Alfvén point, and both the fraction and rate of increase of this flux toward the Sun are consistent with turbulence-driven models in which the solar wind is powered by this flux.
Editor: Saskatoon: The American Astronomical Society
Idioma: Inglês

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The Evolution and Role of Solar Wind Turbulence in the Inner Heliosphere

Saskatoon: The American Astronomical Society

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