Solar Wind Turbulence Spectra and Correlation Scale from 4 to 50 r ⊙: STEREO and PUNCH Observations

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2026
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Abstract
Abstract We investigate the radial evolution of solar wind turbulence using remote-sensing brightness observations from the Solar Terrestrial Relations Observatory (STEREO) and the first science-ready images from the Polarimeter to Unify the Corona and Heliosphere (PUNCH) mission. Exploiting the combined wide fields of view of STEREO’s COR2 coronagraph (4-9 r⊙) and PUNCH’s Wide Field Imager (WFI, 21-50 r⊙), we track the radial evolution of the power spectral density and correlation scale of density fluctuations from 4 to 50 r⊙. Line-of-sight integration systematically steepens the “usual” turbulence scaling laws by a constant offset of about −0.5 across all resolved scales, so that the energy-containing range (nominally k−1) and the inertial range (nominally k−5/3) appear as k−1.5 and k−2.1, respectively – consistent with previous synthetic-image simulations. The correlation scale increases with heliocentric distance across the full range of heliodistances probed, in accordance with previous theoretical models and observations at closer distances from the Sun.
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Authors F. Pecora, G. Nisticò, R. Chhiber, Y. Yang, S. Adhikari, J. J. Wang, R. Patel, Z. Gao, C. DeForest, S. E. Gibson, N. Viall, M. N. Beasley, R. C. Colaninno, J. M. Hughes, R. Killough, D. A. Lamb, G. T. Laurent, C. Lowder, J. Redfern, D. B. Seaton, van Kooten, N. R. Waltham, W. L. Wells, W. H. Matthaeus
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag2115
URL
https://doi.org/10.1093/mnras/stag2115
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