Artículo
The Ion Transition Range of Solar Wind Turbulence in the Inner Heliosphere: Parker Solar Probe Observations
Huang, S. Y.; Sahraoui, F.; Andrés, Nahuel
; Hadid, L. Z.; Yuan, Z. G.; He, J. S.; Zhao, J. S.; Galtier, S.; Zhang, J.; Deng, X. H.; Jiang, K.; Yu, L.; Xu, S. B.; Xiong, Q. Y.; Wei, Y. Y.; Dudok de Wit, T.; Bale, S. D.; Kasper, J. C.
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Fecha de publicación:
03/2021
Editorial:
IOP Publishing
Revista:
Astrophysical Journal Letters
ISSN:
2041-8205
e-ISSN:
2041-8213
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The scaling of the turbulent spectra provides a key measurement that allows us to discriminate between different theoretical predictions of turbulence. In the solar wind, this has driven a large number of studies dedicated to this issue using in situ data from various orbiting spacecraft. While a semblance of consensus exists regarding the scaling in the magnetohydrodynamic (MHD) and dispersive ranges, the precise scaling in the transition range and the actual physical mechanisms that control it remain open questions. Using the high-resolution data in the inner heliosphere from the Parker Solar Probe mission, we find that the sub-ion scales (i.e., at the frequency f ∼ [2, 9] Hz) follow a power-law spectrum f α with a spectral index α varying between -3 and -5.7. Our results also show that there is a trend toward an anticorrelation between the spectral slopes and the power amplitudes at the MHD scales, in agreement with previous studies: the higher the power amplitude the steeper the spectrum at sub-ion scales. A similar trend toward an anticorrelation between steep spectra and increasing normalized cross helicity is found, in agreement with previous theoretical predictions about the imbalanced solar wind. We discuss the ubiquitous nature of the ion transition range in solar wind turbulence in the inner heliosphere.
Palabras clave:
Turbulencia
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Colecciones
Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Huang, S. Y.; Sahraoui, F.; Andrés, Nahuel; Hadid, L. Z.; Yuan, Z. G.; et al.; The Ion Transition Range of Solar Wind Turbulence in the Inner Heliosphere: Parker Solar Probe Observations; IOP Publishing; Astrophysical Journal Letters; 909; 1; 3-2021; 1-6
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