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Article Dans Une Revue The Astrophysical journal letters Année : 2022

Observation and Modeling of the Solar Wind Turbulence Evolution in the Sub-Mercury Inner Heliosphere

Daniele Telloni
Laxman Adhikari
Gary Zank
L. Z. Hadid
Beatriz Sánchez-Cano
Lingling Zhao
Olga Panasenco
Roberto Susino
Anna Milillo
Tommaso Alberti
Roberto Bruno
Raffaella D’amicis
Denise Perrone
Francesco Malara
Julia Stawarz
Ronan Laker
Alessandro Liberatore
Stuart Bale
Justin Kasper
Daniel Heyner
Keith Goetz
Peter Harvey
Robert Macdowall
Marc Pulupa
Anthony Case
Kelly Korreck
Davin Larson
Roberto Livi
Michael Stevens
Phyllis Whittlesey

Résumé

Abstract This letter exploits the radial alignment between the Parker Solar Probe and BepiColombo in late 2022 February, when both spacecraft were within Mercury’s orbit. This allows the study of the turbulent evolution, namely, the change in spectral and intermittency properties, of the same plasma parcel during its expansion from 0.11 to 0.33 au, a still unexplored region. The observational analysis of the solar wind turbulent features at the two different evolution stages is complemented by a theoretical description based on the turbulence transport model equations for nearly incompressible magnetohydrodynamics. The results provide strong evidence that the solar wind turbulence already undergoes significant evolution at distances less than 0.3 au from the Sun, which can be satisfactorily explained as due to evolving slab fluctuations. This work represents a step forward in understanding the processes that control the transition from weak to strong turbulence in the solar wind and in properly modeling the heliosphere.
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Dates et versions

hal-03823347 , version 1 (20-10-2022)

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Daniele Telloni, Laxman Adhikari, Gary Zank, L. Z. Hadid, Beatriz Sánchez-Cano, et al.. Observation and Modeling of the Solar Wind Turbulence Evolution in the Sub-Mercury Inner Heliosphere. The Astrophysical journal letters, 2022, 938 (2), pp.L8. ⟨10.3847/2041-8213/ac9624⟩. ⟨hal-03823347⟩
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