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

Daniele Telloni*, Laxman Adhikari, Gary P. Zank, Lina Z. Hadid, Beatriz Sánchez-Cano, Luca Sorriso-Valvo, Lingling Zhao, Olga Panasenco, Chen Shi, Marco Velli, Roberto Susino, Daniel Verscharen, Anna Milillo, Tommaso Alberti, Yasuhito Narita, Andrea Verdini, Catia Grimani, Roberto Bruno, Raffaella D'Amicis, Denise PerroneRaffaele Marino, Francesco Carbone, Francesco Califano, Francesco Malara, Julia E. Stawarz, Ronan Laker, Alessandro Liberatore, Stuart D. Bale, Justin C. Kasper, Daniel Heyner, Thierry Dudok de Wit, Keith Goetz, Peter R. Harvey, Robert J. MacDowall, David M. Malaspina, Marc Pulupa, Anthony W. Case, Kelly E. Korreck, Davin Larson, Roberto Livi, Michael L. Stevens, Phyllis Whittlesey, Hans Ulrich Auster, Ingo Richter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
4 Downloads (Pure)


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.

Original languageEnglish
Article numberL8
Pages (from-to)1-8
Number of pages8
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 1 Oct 2022
Externally publishedYes


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