Results 91 to 100 of about 2,470 (245)
Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.Abstract We analyze the propagation of a coronal mass ejection (CME) observed on 23 March 2024, at 01:25 UT by SOHO/LASCO using a multi‐instrument and multi‐method approach. The study combines Interplanetary Scintillation (IPS), type II radio bursts, white‐light, in‐situ observations, and 3D tomographic reconstruction of the inner heliospheric density.
G. Baron +10 more
wiley +1 more source
Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.Abstract Io's tenuous atmosphere consists primarily of sulfur dioxide (SO2 ${\text{SO}}_{2}$) with observed column densities of approximately 1016−1017 $1{0}^{16}-1{0}^{17}$ cm−2 ${\text{cm}}^{-2}$. However, it remains uncertain whether the sublimation of SO2 ${\text{SO}}_{2}$ surface frost or volcanic outgassing is the primary source of the SO2 ...
Leander Schlarmann +4 more
wiley +1 more source
Optimizing HAARP Beam Pattern for Generation of Strong F‐Region Field‐Aligned Irregularities
Radio Science, Volume 61, Issue 7, July 2026.Abstract Field‐aligned irregularities (FAIs) are the signatures of plasma turbulence and convection in the mid‐ and high‐latitude F‐region ionosphere, and also provide coherent backscatter targets for HF radars. To serve irregularity generation and characterization studies, we conducted experiments at the High‐frequency Active Auroral Research Program (
T. S. Anderson +7 more
wiley +1 more source
Bregman Wave Distribution Function Method
Radio Science, Volume 61, Issue 7, July 2026.Abstract This study proposes a wave distribution function (WDF) estimation method based on minimizing the Bregman divergence in the function space. The proposed method is entirely data‐driven and requires no hyperparameter tuning during the estimation process. It can be regarded as an extension of the maximum entropy method.
Ryosei Nakazawa +2 more
wiley +1 more source
Driven Collisionless Reconnection of Force-free Flux Tubes: From Onset to Coalescence
The Astrophysical JournalWe investigate the onset of driven collisionless reconnection and plasmoid formation in a magnetically dominated pair plasma, using 2D particle-in-cell simulations.
Camille Granier +3 more
doaj +1 more source
Forecasting Local Geomagnetic Disturbances Using Machine Learning: A Multi‐Station Approach
Space Weather, Volume 24, Issue 7, July 2026.Abstract Geomagnetic indices such as SYM‐H capture global disturbances but fail to resolve regional impacts critical for infrastructure resilience. We present a machine learning model to forecast the Local Disturbance Index (LDi), a validated regional geomagnetic index.
Armando Collado‐Villaverde +3 more
wiley +1 more source
Ultra-High-Energy Cosmic Rays Accelerated by Magnetically Dominated Turbulence
The Astrophysical Journal LettersUltra-high-energy cosmic rays (UHECRs), particles characterized by energies exceeding 10 ^18 eV, are generally believed to be accelerated electromagnetically in high-energy astrophysical sources.
Luca Comisso +2 more
doaj +1 more source
The UK Met Office’s Coronal Mass Ejection (CME) Ensemble Prediction System
Space Weather, Volume 24, Issue 7, July 2026.Abstract We describe the 24‐member Coronal Mass Ejection (CME) ensemble prediction system that is used operationally at the UK's Met Office Space Weather Operations Center (MOSWOC) to forecast the arrival time of CMEs at Earth. The ensemble system was built on ad‐hoc assumptions and there is the need to investigate whether the technique can be improved
Siegfried Gonzi +8 more
wiley +1 more source
Particle Acceleration in Relativistic Alfvénic Turbulence
The Astrophysical JournalStrong magnetically dominated Alfvénic turbulence is an efficient engine of nonthermal particle acceleration in a relativistic collisionless plasma.
Cristian Vega +2 more
doaj +1 more source