Results 21 to 30 of about 675 (171)

Early Stages of Galilean Moon Formation in a Water-depleted Environment

The Astrophysical Journal Letters, 2023
A key feature of the Galilean satellite system is its monotonic decrease in bulk density with growing distance from Jupiter, indicating an ice mass fraction that is zero in the innermost moon Io and about half in the outer moons Ganymede and Callisto ...
Olivier Mousis, A. Schneeberger, Jonathan I. Lunine, Christopher R. Glein, Alexis Bouquet, Steven D. Vance   +5 more
doaj   +1 more source

The generation of Ganymede's diffuse aurora through pitch angle scattering [PDF]

Annales Geophysicae, 2017
Diffuse auroral intensities of neutral atomic oxygen OI λ1356 Å emission on Ganymede due to whistler mode waves are estimated. Pitch angle diffusion of magnetospheric electrons into the loss cone due to resonant wave–particle interaction of whistler ...
A. K. Tripathi, R. P. Singhal, O. N. Singh II   +2 more
doaj   +1 more source

Juno Magnetometer Observations at Ganymede: Comparisons With a Global Hybrid Simulation and Indications of Magnetopause Reconnection

Geophysical Research Letters, 2022
Juno's flyby of Ganymede on 7 June 2021, provides a unique opportunity to explore the moon's magnetosphere. By means of Magnetometer (MAG) observations and a hybrid numerical simulation, we provide a global description of this environment and analyze the
N. Romanelli, G. A. DiBraccio, R. Modolo, J. E. P. Connerney, R. W. Ebert, Y. M. Martos, T. Weber, J. R. Espley, W. S. Kurth, F. Allegrini, P. Valek, S. J. Bolton   +11 more
doaj   +1 more source

Evidence for Magnetic Reconnection at Ganymede's Upstream Magnetopause During the PJ34 Juno Flyby

Geophysical Research Letters, 2022
Juno made a close flyby of Ganymede and flew through its magnetosphere on 7 June 2021, including an outbound crossing of Ganymede's upstream magnetopause. We present plasma and magnetic field observations near the upstream magnetopause from Juno's Jovian
R. W. Ebert, S. A. Fuselier, F. Allegrini, F. Bagenal, S. J. Bolton, G. Clark, J. E. P. Connerney, G. A. DiBraccio, W. S. Kurth, S. Levin, D. J. McComas, J. Montgomery, N. Romanelli, A. H. Sulaiman, J. R. Szalay, P. Valek, R. J. Wilson   +16 more
doaj   +1 more source

Thermal Convection in the Core of Ganymede Inferred from Liquid Eutectic Fe-FeS Electrical Resistivity at High Pressures

Crystals, 2021
The core of Ganymede is suggested to be mainly Fe but with a significant proportion of S. Effects of S as a core constituent are freezing-point depression, allowing for a molten core at relatively low core temperatures, and modification of transport ...
Joshua A. H. Littleton, Richard A. Secco, Wenjun Yong   +2 more
doaj   +1 more source

Measuring Ganymede’s Librations with Laser Altimetry

Geosciences, 2019
Jupiter’s moon Ganymede might be in possession of a subsurface ocean located between two ice layers. However, from Galileo data it is not possible to unambiguously infer the thickness and densities of the individual layers.
Gregor Steinbrügge, Teresa Steinke, Robin Thor, Alexander Stark, Hauke Hussmann   +4 more
doaj   +1 more source

Alternating North‐South Brightness Ratio of Ganymede's Auroral Ovals: Hubble Space Telescope Observations Around the Juno PJ34 Flyby

Geophysical Research Letters, 2022
We report results of Hubble Space Telescope observations from Ganymede's orbitally trailing side which were taken around the flyby of the Juno spacecraft on 7 June 2021.
Joachim Saur, Stefan Duling, Alexandre Wennmacher, Clarissa Willmes, Lorenz Roth, Darrell F. Strobel, Frédéric Allegrini, Fran Bagenal, Scott J. Bolton, Bertrand Bonfond, George Clark, Randy Gladstone, Thomas K. Greathouse, Denis C. Grodent, Candice J. Hansen, William S. Kurth, Glenn S. Orton, Kurt D. Retherford, Abigail M. Rymer, Ali H. Sulaiman   +19 more
doaj   +1 more source

Updated Interior Structure of Callisto From a Reanalysis of Galileo Data

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract The internal structure of Callisto has been a long‐standing question since the Galileo mission. Previous analyses suggested a largely undifferentiated interior. We present an updated interior structure for Callisto derived from a reanalysis of Galileo's Doppler tracking data using new signal processing techniques.
G. Cascioli, F. Petricca, E. Mazarico, D. Buccino, C. Cochrane, J. Castillo‐Rogez   +5 more
wiley   +1 more source

Detecting an Ocean Inside Callisto With Geodetic Measurements From Europa Clipper and Juice

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract Determining whether Callisto hosts a subsurface ocean, and the implications for material and energy transport through its hydrosphere, is of high interest to NASA's Europa Clipper and ESA's Juice missions. A recent reanalysis of Galileo magnetometer data strengthens the ocean hypothesis, but definitive confirmation awaits new measurements.
Flavio Petricca, Gael Cascioli, Erwan Mazarico   +2 more
wiley   +1 more source

Super‐Resolution of Planetary Images Based on Generative Adversarial Network

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 4, August 2026.
Abstract Currently, satellite imagery serves as the primary means of observing terrestrial planets such as the Mars, the Moon, and Mercury. Enhancing the resolution and quality of these images can provide more detailed insights into planetary surfaces. However, improvements in image quality are often limited by the constraints of sensor technology and ...
Xiaoran Zhang, Yiran Wang, Miao Zhuo
wiley   +1 more source