Results 81 to 90 of about 69,070 (213)

Guide for Conducting “Community Challenges” in Space Physics

Earth and Space Science, Volume 12, Issue 5, May 2025.
Abstract The Geospace Environment Modeling (GEM) program regularly issues “community challenges” in which researchers examine a particular space physics phenomenon or geomagnetic activity event, often running numerical models to assess dominant processes and understand the timing and relationship of observed signatures.
Michael W. Liemohn, Lutz Rastätter, Alexa J. Halford, Yihua Zheng, Katherine S. Garcia‐Sage, Robert Redmon, Sarah K. Vines   +6 more
wiley   +1 more source

On the two-dimensional state in driven magnetohydrodynamic turbulence [PDF]

, 2010
The dynamics of the two-dimensional (2D) state in driven tridimensional (3D) incompressible magnetohydrodynamic turbulence is investigated through high-resolution direct numerical simulations and in the presence of an external magnetic field at various intensities.
arxiv   +1 more source

Spectral Properties of Compressible Magnetohydrodynamic Turbulence from Numerical Simulations [PDF]

Astrophys.J. 590 (2003) 858-873, 2003
We analyze the spectral properties of driven, supersonic compressible magnetohydrodynamic (MHD) turbulence obtained via high-resolution numerical experiments, for application to understanding the dynamics of giant molecular clouds. Via angle-averaged power spectra, we characterize the transfer of energy from the intermediate, driving scales down to ...
arxiv   +1 more source

DENSITY-MAGNETIC FIELD CORRELATION IN MAGNETOHYDRODYNAMIC TURBULENCE DRIVEN BY DIFFERENT DRIVING SCHEMES WITH DIFFERENT CORRELATION TIMES

The Astrophysical Journal, 2016
ABSTRACT Turbulent motions naturally produce density and magnetic-field fluctuations. Correlation between the two fluctuations is important for interpretation of observations, such as observations of the rotation measure (RM). In this paper, we study the effect of driving schemes on the density-magnetic-field correlation.
Heesun Yoon, Jungyeon Cho, Jongsoo Kim
openaire   +2 more sources

Pressure-gradient-induced Alfven eigenmodes: II. Kinetic excitation with ion temperature gradient

, 2009
The kinetic excitation of ideal magnetohydrodynamic (MHD) discrete Alfven eigenmodes in the second MHD ballooning stable domain is studied in the presence of a thermal ion temperature gradient (ITG), using linear gyrokinetic particle-in-cell simulations ...
Bierwage, Andreas, Chen, Liu, Zonca, Fulvio   +2 more
core   +1 more source

A Novel Model for Forecasting Geomagnetic Indices Using Machine Learning

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract Widely used geomagnetic activity indices like Kp or Dst, derived from the combined data from several observatories distributed worldwide, are crucial to forecasting since solar‐driven geomagnetic activity can significantly affect technology and human activities on Earth and in near‐Earth space.
Guram Kervalishvili, Ingo Michaelis, Monika Korte, Jan Rauberg, Jürgen Matzka   +4 more
wiley   +1 more source

Observational Characteristics of Electron Distributions in the Martian Induced Magnetotail

Geophysical Research Letters, Volume 52, Issue 7, 16 April 2025.
Abstract Mars's magnetotail represents a unique case within the solar system, embodying both intrinsic and induced magnetic fields. Yet, the electron dynamics within this region have remained largely unexplored. Utilizing nine years of electron and magnetic field data from the Mars Atmosphere and Volatile EvolutioN mission (MAVEN), we conducted a ...
Chi Zhang, Chuanfei Dong, Hongyang Zhou, Jan Deca, Shaosui Xu, Yuki Harada, Shannon M. Curry, David L. Mitchell, Zhi‐Yang Liu, Junfeng Qin, Christian Mazelle   +10 more
wiley   +1 more source

Properties of Magnetohydrodynamic Modes in Compressively Driven Plasma Turbulence

Physical Review X, 2020
We study properties of magnetohydrodynamic (MHD) eigenmodes by decomposing the data of MHD simulations into linear MHD modes—namely, the Alfvén, slow magnetosonic, and fast magnetosonic modes.
K. D. Makwana, Huirong Yan
doaj   +1 more source

On the significance of polarization charge and isomagnetic surface in the interaction between conducting fluid and magnetic field

, 2014
From the frozen-in field lines concept, a highly conducting fluid can move freely along, but not traverse to, magnetic field lines. We discuss this topic and find that in the study of the frozen-in field lines concept, the effects of inductive and ...
Liang, Yi, Liang, Zhu-Xing
core   +3 more sources

The Speed of Interplanetary Shocks Through the Magnetosheath: A Toy Model

Geophysical Research Letters, Volume 52, Issue 7, 16 April 2025.
Abstract Before interacting with the magnetosphere, an interplanetary shock travels through the magnetosheath where its speed and shape are modified. Previous studies have reported widely different answers to the question of the speed of an interplanetary shock in the magnetosheath. Observational studies generally answer this question “macroscopically”,
C. Moissard, C. Butcher, E. Ruler, J. Richardson, B. Michotte de Welle, W. Steward, M. Pritchard, D. Gonzalez Del Valle, V. Defayet, A. Bernal, V. Cavicchi, V. David   +11 more
wiley   +1 more source