Results 91 to 100 of about 411,589 (180)

Statistical Study of Magnetic Overshoots at Collisionless Shocks

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract We use data from the Magnetospheric Multiscale, Solar Orbiter, and Cassini spacecraft to statistically study magnetic overshoots at Earth's bow shock, interplanetary shocks, and Saturn's bow shock. The size of the magnetic overshoot exhibits a clear positive correlation with the Alfvénic Mach number and its dependence on the upstream plasma ...
M. Lindberg, H. Hietala, K. Shirazul, D. Trotta, A. H. Sulaiman, B. L. Burkholder, A. Dimmock   +6 more
wiley   +1 more source

Parameters of Chelyabinsk and Tunguska Objects and their Explosion Modes [PDF]

arXiv, 2013
This paper describes briefly a mathematical model that relates the parameters of celestial bodies motion in the spheres of activity of the Sun and the Earth with mass-energy characteristics of these celestial bodies and their explosion modes during destruction in the Earth atmosphere, that in turn are linked with phenomena observed on the underlying ...
arxiv  

Inferring Fireball Velocity Profiles and Characteristic Parameters of Meteoroids From Incomplete Data Sets

Journal of Geophysical Research: Planets, Volume 130, Issue 5, May 2025.
Abstract Extracting additional information from old or incomplete fireball data sets remains a challenge. To address missing point‐by‐point observations, we introduce a method for estimating atmospheric flight parameters of meteoroids using metaheuristic optimization techniques.
Eloy Peña‐Asensio, Maria Gritsevich
wiley   +1 more source

The Link Between Subsurface Rheology and Ejecta Mobility: The Case of Small New Impacts on Mars

Journal of Geophysical Research: Planets, Volume 130, Issue 5, May 2025.
Abstract The dynamics of crater ejecta are sensitive to the material properties of the target, much like the crater size and morphology. We isolate and quantify the effect of target properties on the ejecta mobility (EM) ‐ the maximum radial extent of ejecta scaled by the crater radius.
A. J. Sokolowska, G. S. Collins, I. J. Daubar, M. Jutzi   +3 more
wiley   +1 more source

Persistence of Plasma Waves in the Heliosphere and Beyond [PDF]

arXiv
Dynamics of Langmuir modes - Langmuir waves (LW) and shear Langmuir vortices (SLV) - in kinematically complex astrophysical plasma flows is studied. It is found that they exhibit a number of peculiar, velocity shear induced, asymptotically persistent phenomena: efficient energy exchange with the background flow, various kinds of instabilities, leading ...
arxiv  

Bivariate Extreme Value Analysis for Space Weather Risk Assessment: Solar Wind—Magnetosphere Driving in the Terrestrial System

Space Weather, Volume 23, Issue 5, May 2025.
Abstract As society moves toward greater dependence on technology, understanding and predicting extreme Space Weather becomes increasingly important. Indeed, the complex, simultaneous interplay between multiple phenomena can unpack further insight into Space Weather effects.
Alexandra Ruth Fogg, D. Healy, C. M. Jackman, A. C. Parnell, M. J. Rutala, S. C. McEntee, S. J. Walker, P. T. Gallagher, C. F. Bowers   +8 more
wiley   +1 more source

Numerical simulations of multi-scale astrophysical problems: The example of Type Ia supernovae

, 2007
Vastly different time and length scales are a common problem in numerical simulations of astrophysical phenomena. Here, we present an approach to numerical modeling of such objects on the example of Type Ia supernova simulations.
Roepke, F. K.
core   +1 more source

Studying the Inner Heliosphere Using Radio Signals Transmitted From Spacecraft Orbiting Mars

Space Weather, Volume 23, Issue 5, May 2025.
Abstract In this campaign, we used very long baseline interferometry (VLBI) radio telescopes to track the carrier radio signal transmitted from spacecraft orbiting Mars during the Mars solar conjunction. The campaign extended from September 6th $6\text{th}$ to November 6th $6\text{th}$ 2021 and targeted the Mars Express (MEX) and Tianwen‐1 (TIW ...
J. Edwards, G. Molera Calvés, P. Kummamuru, N. M. M. Said, M. Ma   +4 more
wiley   +1 more source

A Compact Solution for Improving the Spatial Density of Observations of Large Ground Level Enhancements

Space Weather, Volume 23, Issue 5, May 2025.
Abstract Ground level enhancements (GLEs), which occur when high energy solar protons reach Earth, are a considerable space weather hazard for aviation activities. Neutron monitor (NM) observations of these events are the key input to operational models of ionizing radiation at aviation altitudes.
F. Baird, K. A. Ryden, F. Lei, C. S. Dyer   +3 more
wiley   +1 more source

Imbalanced Regression Artificial Neural Network Model for Auroral Electrojet Indices (IRANNA): Can We Predict Strong Events?

Space Weather, Volume 23, Issue 5, May 2025.
Abstract We develop an Imbalanced Regression Artificial Neural Network model for the Auroral electrojet index (IRANNA) to predict the SuperMAG SML index, addressing the heavily imbalanced distribution of the SML data set. The data set contains mostly quiet‐time values of lesser importance and very few strong‐to‐extreme values of interest, such as those
Xiangning Chu, Lucas Jia, Robert L. McPherron, Xinlin Li, Jacob Bortnik   +4 more
wiley   +1 more source