Results 121 to 130 of about 258,357 (262)

Mass Flows in Expanding Coronal Loops

The Astrophysical Journal
An expansion of the cross-sectional area directly impacts the mass flow along a coronal loop and significantly alters the radiative and hydrodynamic evolution of that loop as a result.
Jeffrey W. Reep, Roger B. Scott, Sherry Chhabra, John Unverferth, Kalman J. Knizhnik   +4 more
doaj   +1 more source

On the Possibility of Driving the Electron Flux Probabilistic Models by the AE Index

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract We present the new probabilistic model of the electron fluxes designed to assess the risks of the spacecraft surface charging for missions with near‐equatorial orbits in the inner magnetosphere. It is a second model developed within a frame of the European Space Agency's activity “Plasma Environment Modeling in the Earth's Magnetosphere ...
S. Dubyagin, N. Ganushkina, A. Sicard, J.‐C. Matéo‐Vélez, L. Monnin, D. Heynderickx, P. Jiggens, G. Deprez, F. Cipriani   +8 more
wiley   +1 more source

Filament Formation due to Diffusive Instabilities in Dusty Protoplanetary Disks

The Astrophysical Journal
We report the finding of a new, local diffusion instability in a protoplanetary disk which can operate in a dust fluid, subject to mass diffusion, shear viscosity, and dust–gas drag, provided the diffusivity, viscosity, or both, decrease sufficiently ...
Konstantin Gerbig, Min-Kai Lin, Marius Lehmann   +2 more
doaj   +1 more source

Numerical Methods for Simulating Star Formation

Frontiers in Astronomy and Space Sciences, 2019
We review the numerical techniques for ideal and non-ideal magneto-hydrodynamics (MHD) used in the context of star formation simulations. We outline the specific challenges offered by modeling star forming environments, which are dominated by supersonic ...
Romain Teyssier, Benoît Commerçon
doaj   +1 more source

Ionosphere‐Thermosphere Coupling in the Northern Polar Region During the May 2024 Geomagnetic Superstorm

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract The May 2024 superstorm, as the most intense geomagnetic storm since 2003, caused a variety of disturbances in the magnetosphere‐ionosphere‐thermosphere system. This study investigates the long‐lasting electron density depletion in the polar region and the underlying ionosphere‐thermosphere coupling, based on a comprehensive set of ...
Lei Cai, Anita Aikio, G. P. Geethakumari, Heikki Vanhamäki, I. I. Virtanen, Shin‐ichiro Oyama, Yongliang Zhang, Jiaojiao Zhang, Marc Hairston   +8 more
wiley   +1 more source

Addressing Known Challenges in Solar Flare Forecasting I: Limb‐Flare Prediction With a 4π Full‐Heliosphere Framework

Space Weather, Volume 24, Issue 2, February 2026.
Abstract A demonstrated failure mode for operational solar flare forecasting is the inability to forecast flares that occur near, or just beyond, the solar limb. To address this shortcoming, we develop a “4π $4{\uppi }$” full‐heliosphere event forecasting framework and evaluate its statistical classification ability against this specific challenge.
K. D. Leka, Eric L. Wagner, Lisa Upton, Bibhuti Kumar Jha, Kiran Jain, Sara Petty   +5 more
wiley   +1 more source

MAVEN EUVM Data Products for Space Weather at Mars

Space Weather, Volume 24, Issue 2, February 2026.
Abstract Space weather monitoring is critical to protect not only our technological assets in space, but also mitigate disruptions to life and society that depends on these vulnerable assets. Significant attention and resources have been dedicated to space weather monitoring at Earth, but little attention to date has been paid to planetary space ...
P. C. Chamberlin, G. A. DiBraccio, R. J. Borelli, Y. M. Collado‐Vega, S. Curry, F. G. Eparvier, C. O. Lee, M. L. Mays, E. M. B. Thiemann, C. Wiegand   +9 more
wiley   +1 more source

A Relativistic Formula for the Multiple Scattering of Photons

The Astrophysical Journal Letters
We have discovered analytical expressions for the probability density function (PDF) of photons that are multiply scattered in relativistic flows, under the assumption of isotropic and inelastic scattering.
Rohta Takahashi, Masayuki Umemura, Ken Ohsuga, Yuta Asahina, Rintaro Takeda, Mikiya M. Takahashi, Norita Kawanaka, Kohkichi Konno, Tomoaki Nagasawa   +8 more
doaj   +1 more source

Radiatively driven convection: diffusivity-free regimes of geophysical and astrophysical flows in the laboratory

Comptes Rendus. Physique
We consider the turbulent heat transport induced by thermal convection. The widespread belief is that the transport properties of the turbulent flow should be independent of the tiny molecular diffusivities for asymptotically strong driving, but the ...
Hadjerci, Gabriel, Bouillaut, Vincent, Miquel, Benjamin, Aumaître, Sébastien, Gallet, Basile   +4 more
doaj   +1 more source

High‐Latitude Electrodynamics and Thermospheric Density Variations During the 2024 Gannon Storm

Space Weather, Volume 24, Issue 2, February 2026.
Abstract This study investigates high‐latitude electrodynamics and thermospheric density variations during the 2024 Gannon's storm. First, the auroral precipitation module of Auroral Spectra and High‐Latitude Electric field variabilitY, ASHLEY‐A, is improved to more accurately capture the location of auroral precipitation observed during this ...
Qingyu Zhu, Sarah Vines, Marc Hairston, Yun‐Ju Chen, Phillip Anderson, Cheng Sheng, Yue Deng   +6 more
wiley   +1 more source