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@article{Iizawa:2026:2041-8213/aea84b,
author = {Iizawa, M and Narita, Y and Alberti, T and Bale, SD and Brandenburg, A and Chian, ACL and Comiel, H and Matsukiyo, S and Yokoi, N},
doi = {2041-8213/aea84b},
journal = {Astrophysical Journal Letters},
title = {Nonlocal Evolution of Magnetic Helicity across the Magnetohydrodynamic–Kinetic Interface},
url = {http://dx.doi.org/10.3847/2041-8213/aea84b},
volume = {1010},
year = {2026}
}
TY - JOUR
AB - Magnetic helicity is typically indistinguishable from noise in the solar wind inertial range. Using Parker Solar Probe measurements (0.1–0.8 au), we report a robust bihelical structure emerging at the magnetohydrodynamic (MHD)–kinetic interface. This structure, formed by a striking pair of positive and negative peaks, exhibits a systematic spectral migration toward lower frequencies with increasing heliocentric distance. Crucially, this evolution deviates from local kinetic scaling laws, such as the radial decline of the ion cyclotron frequency, reflecting a nonlocal evolution of magnetic topology. Our findings provide a new observational constraint on both nonlocal MHD transport processes and the nature of the helicity barrier in the kinetic regime.
AU - Iizawa,M
AU - Narita,Y
AU - Alberti,T
AU - Bale,SD
AU - Brandenburg,A
AU - Chian,ACL
AU - Comiel,H
AU - Matsukiyo,S
AU - Yokoi,N
DO - 2041-8213/aea84b
PY - 2026///
SN - 2041-8205
TI - Nonlocal Evolution of Magnetic Helicity across the Magnetohydrodynamic–Kinetic Interface
T2 - Astrophysical Journal Letters
UR - http://dx.doi.org/10.3847/2041-8213/aea84b
VL - 1010
ER -