Abstract Observations by Voyager 1 from 2020 through mid-2025 reveal that the magnetic field environment in the posthump region remains remarkably distinct from the region upstream of the second pressure front (pf2). Unlike the relaxation observed in earlier “jump–ramp” events, the magnetic field strength ( B ) has not returned to prior levels but has maintained a sustained elevation between 0.45 and 0.53 nT. Concurrently, the magnetic field orientation has shown an accelerated rotation toward the nominal Parker spiral configuration ( λ B ≈ 270°, δ B ≈ 0°), driven by a significant decrease in the normal component ( B N ). In terms of turbulence, both long-term and short-term intermittency analyses indicate that while fluctuations persist, the overall intermittency has trended downward following the pf2. While the transverse components ( B R and B N ) have maintained Gaussian statistics ( q ≈ 1) for much of the recent period, their q parameters exhibited transient spikes in 2023 and 2024. The compressible component ( B T ) similarly showed a temporary resurgence of intermittency in late 2024 before stabilizing again in early 2025. Although further data from the latter half of 2025 are required for a definitive conclusion, these results suggest that Voyager 1 has not yet transitioned into a pristine interstellar medium entirely devoid of solar influence. Instead, it remains within a perturbed, very local interstellar medium environment characterized by weakening but persistent intermittent turbulence.
Park et al. (Wed,) studied this question.