Results 31 to 40 of about 675 (171)

Surface Features of Ganymede Revealed in Jupiter‐Shine by Juno’s Stellar Reference Unit

Geophysical Research Letters, 2022
On 7 June 2021, Juno crossed the orbital path of Jupiter’s moon Ganymede, flying within 1,046 km of the surface. Juno’s low‐light‐sensitive Stellar Reference Unit (SRU) navigation camera captured an image of the satellite’s dark side in a region of ...
Heidi N. Becker, Meghan M. Florence, Martin J. Brennan, Candice J. Hansen, Paul M. Schenk, Michael A. Ravine, John K. Arballo, Scott J. Bolton, Jonathan I. Lunine, Alexandre Guillaume, James W. Alexander   +10 more
doaj   +1 more source

A Physics‐Based Frequency‐Temperature Seismic Anelastic Attenuation Model for Planetary Ice Shells

Earth and Space Science, Volume 13, Issue 8, August 2026.
Abstract Intrinsic attenuation in planetary ices remains poorly constrained at seismic frequencies and low temperatures, limiting quantitative predictions of wave propagation in icy moons. Existing models typically rely on constant‐Q, or power‐law formulations that lack microphysical grounding and fail to capture the strong temperature sensitivity of ...
L. Delaroque, A. Lucas, T. Kawamura, S. Rodriguez   +3 more
wiley   +1 more source

Three-dimensional Magnetohydrodynamic Simulations of Periodic Variations of Ganymede’s Footprint

The Astrophysical Journal
Alfvénic power is generated through the interaction between the mini-magnetosphere of Ganymede and the corotating flow of the Jovian plasma, contributing to the formation of the Ganymede auroral footprint at Jupiter’s ionosphere.
Tao Yan, Binzheng Zhang, Junjie Chen, Zhiqi Zheng, Ziyi Yang, Shengyi Ye, Jun Cui   +6 more
doaj   +1 more source

Energetic Charged Particle Fluxes Relevant to Ganymede's Polar Region

Geophysical Research Letters, 2022
The JEDI instrument made measurements of energetic charged particles near Ganymede during a close encounter with that moon. Here we find ion flux levels are similar close to Ganymede itself but outside its magnetosphere and on near wake and open field ...
C. Paranicas, B. H. Mauk, P. Kollmann, G. Clark, D. K. Haggerty, J. Westlake, L. Liuzzo, A. Masters, T. A. Cassidy, F. Bagenal, S. Bolton   +10 more
doaj   +1 more source

Reconstructing Europa's Atmosphere From H2+ ${\mathbf{H}}_{\mathbf{2}}^{+}$ Pickup Ions Detected During the Juno PJ45 Flyby

Journal of Geophysical Research: Planets, Volume 131, Issue 8, August 2026.
Abstract We use a suite of single‐species (H2 ${\mathrm{H}}_{2}$) and multispecies (H2+O2+H+O ${\mathrm{H}}_{2}+{\mathrm{O}}_{2}+\mathrm{H}+\mathrm{O}$) Direct Simulation Monte Carlo models of Europa's atmosphere to interpret the H2+ ${\mathrm{H}}_{2}^{+}$ pickup ions detected by Juno at distances beyond 2 $2$ Europa radii RE $\left({R}_{E}\right ...
Shane R. Carberry Mogan, Andrew R. Poppe, Lucas Liuzzo, Jamey R. Szalay, Sean P. Ellis, Robert E. Johnson, Lorenz Roth   +6 more
wiley   +1 more source

Light Element Exsolution in Fe‐Si‐C‐(H) System: A Mechanism for Powering Mercury's Early Core Dynamo

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Mercury is one of the few terrestrial planets in the solar system with a magnetic field, yet the energy source to power its core dynamo remains unclear to date. Si, C, and possibly H are the top candidate light elements for its liquid core. Here, we showed experimentally that Si, C, and H in Fe‐Si‐C and Fe‐Si‐C‐H liquids share a simultaneous ...
Yuanjing Li, Liangliang Zhang, Fabin Pan, Xiaojing Lai, Xiang Wu, Feng Zhu   +5 more
wiley   +1 more source

Analysis of Close Encounters With Ganymede and Callisto Using a Genetic n-Body Algorithm

Frontiers in Astronomy and Space Sciences, 2018
In this work we describe a genetic algorithm which is used in order to study orbits of minor bodies in the frames of close encounters. We find that the algorithm in combination with standard orbital numerical integrators can be used as a good proxy for ...
Philip M. Winter, Mattia A. Galiazzo, Thomas I. Maindl   +2 more
doaj   +1 more source

Driver of Energetic Electron Precipitation in the Vicinity of Ganymede

Geophysical Research Letters, 2023
The driver of energetic electron precipitation into Ganymede's atmosphere has been an outstanding open problem. During the Juno flyby of Ganymede on 7 June 2021, Juno observed significant downward‐going electron fluxes inside the bounce loss cone of ...
W. Li, Q. Ma, X.‐C. Shen, X.‐J. Zhang, B. H. Mauk, G. Clark, F. Allegrini, W. S. Kurth, G. B. Hospodarsky, A. Sulaiman, T. A. Nordheim, S. J. Bolton   +11 more
doaj   +1 more source

Reproducing Ganymede's Craters With the Melosh Model of Acoustic Fluidization

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract An impact event excavates a bowl‐shaped transient cavity, which subsequently collapses under gravity. For larger cavities, gravitational forces exceed the strength of the target material beneath the cavity, resulting in central uplift and a reduced final depth‐to‐diameter ratio (≤ ${\le} $1/10).
Sowon Lee, B. C. Johnson
wiley   +1 more source

How Does Ice Shell Geometry Shape Ocean Dynamics on Icy Moons?

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract A poleward‐thinning ice shell can drive circulation in the subsurface oceans of icy moons by imposing a meridional temperature gradient–colder at the equator than the pole–through the freezing point suppression due to pressure. This temperature gradient sets a buoyancy gradient, whose sign depends on the thermal expansion coefficient ...
Yixiao Zhang, Wanying Kang, John Marshall   +2 more
wiley   +1 more source