Space Physics Papers of the Week

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.

This work presents the Heteroskedasticity and Autocorrelation Consistent Dimensionless Averaged Normalised Innovation Squared (HAC-DANIS) test, which evaluates process noise calibration from the innovation sequence of the filter, without ground truth.

We pose the reconstruction of an effective boundary speed at $21.5\,R_\odot$ as an inverse problem and train a map from solar observations to that boundary by differentiating through a reduced heliospheric transport solver from 21.5$\,R_\odot$ to measurement locations near the L1 Lagrangian point.

Context: The study investigates the complexity of the formation and evolution of a dome-spire-shaped jet (or anemone jet) that originated in an active region and was presumably driven by null-point magnetic reconnection. Aims: We aim to provide a quantitative estimation of multi-temperature plasma dynamics and physical parameters of the jet and its blob-like features, together with its temporal evolution in three-dimensional perspective.

We develop BO-T (BO-Tian), an improved version of BO combining two methods.

Recent re-analysis of the flyby, however, suggests that these observations were not taken during normal solar wind conditions, and instead occurred while a large solar wind transient, a corotating interaction region, was passing over the system. With this context, this study compares the Voyager 2 observations to a similar event observed at Earth.

Energetic-particle irradiation can produce persistent charge separation within lunar regolith, but the internal fields predicted by subsurface-charging models depend on how particle interactions are translated into retained charge. This critical review examines the evidence and assumptions connecting microscopic charge formation to macroscopic charging.

This work presents a web application for retrospective detection and analysis of geomagnetic storms using hourly Dst and solar wind data from OMNIWeb.

We present the Neural Density Model (NDM), a 3D density reanalysis for October 2003--October 2026 at 250--800~km.

The method used in this study attempts to identify which of the two main acceleration processes is more dominant for specific particle energies and species in a standalone event.

In this work, we study the turbulent origin of ion-scale Current Sheets (CSs) and the dissipation of energy via magnetic reconnection.

We present a statistical study of magnetic reconnection and current sheet (CS) properties at scales from the ion inertial length ($\delta_i$), up to 86.4 $\delta_i$.

Within the framework of ideal hydrodynamics, the simplest plasma model is applicable to the initial stage of generation of plasma structures. In this case, rigorous analytical solutions are constructed from blocks.

Environmental memory can return correlations to the source without delivering them to that observer\cite{ChenQi,ChenMemory}. Here we establish a sharp recovery frontier at fixed mean radiation yield for single-excitation channels and realize its qubit limit with an autonomous quantum-memory emitter.

Suprathermal ion tails throughout the heliosphere follow a ``common spectrum,'' $f(v)\propto v^{-5}$. We show that scale-by-scale equipartition between strong Alfvénic turbulence and the ions it accelerates predicts both this exponent and the absolute amplitude, $F(v)=B^2/(16\pi^3 m_i v^5)$, with no free parameters.

We investigate the influence of physical CME properties prescribed at 0.1 AU on their subsequent heliospheric propagation and geoeffectiveness at Earth, using the SWASTi framework.