21 papers
This paper presents small-scale prototype testing and a novel, computationally-efficient control allocation algorithm for the CABLESSail concept, demonstrating its ability to effectively manage solar sail momentum through cable-actuated shape control while maintaining robustness against membrane shape uncertainties.
This paper utilizes 2D3V PIC simulations to demonstrate that in freely decaying sub-ion turbulence, intermittent regions with non-zero drive helicity reduction, motivating a new history-dependent helicity density that reveals time-invariant intermediate-scale plateaus consistent with kinetic decay constraints.
This paper demonstrates that the linear relationship between sunspot and white-light facular areas at the onset of solar cycles serves as a highly accurate, physically based predictor of cycle amplitude up to four years in advance, successfully confirming historical data and correctly forecasting a larger-than-expected Cycle 25.
Using multi-spacecraft observations from Earth's magnetosheath, this study provides the first quantitative evidence that compressible MHD turbulence exhibits a weak-to-strong transition specifically in slow modes, while fast modes remain weakly turbulent, thereby offering a comprehensive characterization of spatiotemporal properties across different turbulence regimes.
This paper proposes a Federated Learning framework for LEO 6G Non-Terrestrial Networks that leverages High-Altitude Platform Stations to distribute beam selection tasks, demonstrating that a Graph Neural Network model outperforms a Multi-Layer Perceptron in prediction accuracy and stability, especially at low elevation angles.
This study analyzes Juno spacecraft data to demonstrate that narrow electron beams observed in Jupiter's middle magnetosphere are statistically consistent with and originate from auroral acceleration processes in the planet's polar regions.
This paper introduces a new 3D dynamical model, SOCOL:14C-Ex, to analyze the atmospheric production and transport of radiocarbon during extreme solar particle events, enabling the precise characterization and strength assessment of seven major Miyake events over the past 14,000 years, with the 12351 BC event identified as the strongest overall and the AD 774 event as the strongest of the Holocene.
This study employs a three-component plasma model and Sagdeev potential formalism to determine the Mach number ranges and physical limitations, such as double layers and density constraints, governing the existence of large-amplitude electron-acoustic solitons with both negative and positive potentials in two-temperature electron space plasmas.
This paper argues that a persistent, cycle-invariant discrepancy between radio brightness temperatures and hydrostatic scale-height modeling in the quiet solar corona provides evidence for non-Maxwellian, kappa-distributed electron velocity distributions with kappa values of approximately 2–3, rather than the turbulent scattering or standard thermal equilibrium models previously assumed.
This study demonstrates that velocity dispersion analysis (VDA) often yields inaccurate solar injection times and path lengths for Solar Energetic Particles because the method is significantly biased by interplanetary magnetic turbulence and the energy dependence of the pre-event proton background.
This paper presents an open-source dynamical box model to simulate global abiotic sulfur cycling on Earth-like planets, revealing that the absence of life would result in marine sediment sulfate concentrations two orders of magnitude higher and sulfide concentrations four orders of magnitude lower than on present-day Earth.
This study utilizes surface flux transport modeling and randomized simulations to demonstrate that the non-random longitudinal distribution of active regions, particularly recurrent flux emergence in the southern hemisphere, significantly reinforced the large-scale equatorial magnetic field during the declining phase of solar cycle 24, while also showing that incorporating both axial and equatorial dipole components provides better constraints for model optimization than using the axial dipole alone.
This White Paper advocates for a coordinated UK programme integrating high-precision observations, advanced theory, and machine learning to advance Magnetohydrodynamic (MHD) seismology, thereby addressing critical solar physics challenges and enhancing space weather forecasting capabilities.
This paper presents a universal theoretical model that successfully predicts the maximum energy limits of radiation belts across planetary and brown dwarf magnetospheres using only surface magnetic field strength, revealing a 7 TeV asymptotic bound and offering new insights into galactic cosmic ray sources and exoplanet habitability.
This study presents the first definitive eight-sigma detection of the C3 molecule in Titan's atmosphere using ultra-high-resolution VLT-ESPRESSO observations, confirming a column density consistent with photochemical models and demonstrating the efficacy of exoplanet research techniques for Solar System targets.
Using high-resolution MMS data, this study provides observational evidence that ion-acoustic-like electrostatic wave activity is causally linked to the formation of cavitons (localized density depletions) within foreshock transients, a relationship best quantified by normalizing potential fluctuations by electron temperature.
This study utilizes multi-point in-situ observations of Earth's bow shock to demonstrate that backstreaming ions create cavitons that facilitate the formation of a new quasi-parallel supercritical shock layer through the nonlinear growth driven by gyrating suprathermal ions and subsequent plasma compression.
This paper presents a multidisciplinary design optimization framework using OpenMDAO and Dymos that simultaneously optimizes low-thrust trajectories and spacecraft power systems for asteroid orbit insertion, explicitly coupling variable-specific impulse Hall thruster performance with time-varying solar power availability to overcome the limitations of traditional simplifying assumptions.
This study characterizes the 2017 Mukundpura CM2 carbonaceous chondrite from Rajasthan, India, using high-resolution microscopy and Raman spectroscopy to confirm the presence of 3–5 nm nanocrystalline diamonds alongside graphitic carbon and abundant iridium, offering insights into stellar evolution and the geological impact anomalies associated with mass extinctions.
This study reconstructs and analyzes the first four ground-level enhancements (GLEs) from the 1940s by digitizing forgotten cosmic-ray data, revealing distinct temporal evolution patterns and spectral hardness characteristics for these historically missing events.