Results 121 to 130 of about 2,627,055 (211)

Construction of Ultraslow‐Spreading Oceanic Crust: New Insights on Volcanic Processes and Deposits From High‐Resolution Mapping at the Mohns Ridge

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract The volcanic activity at ultraslow‐spreading ridges is less understood compared with that at faster‐spreading ridges. Studies of year‐to‐year changes along the faster‐spreading ridges have provided important information regarding the size and frequency of eruptions.
Håvard Hallås Stubseid, Anders Bjerga, Ryan Portner, Haflidi Haflidason, Rolf Birger Pedersen   +4 more
wiley   +1 more source

Electron Phase Space Densities in Geostationary Orbits as Measured With GK2A, GOES‐16, and GOES‐17 Satellites

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract This study investigated electron phase space densities (PSDs) in geostationary orbits using data from Korea's geostationary satellite, GK2A, as well as GOES‐16 and GOES‐17 satellites. The PSDs were computed from electron fluxes measured by each satellite during a geomagnetically quiet period as defined by stringent conditions on geomagnetic ...
C. H. Lee, J. Seon, W. H. Seol, K. H. Kim, D. E. Larson, G. K. Parks, H. U. Auster, W. Magnes, S. Kraft, D. Y. Lee, A. Boudouridis, P. T. M. Loto'aniu, J. V. Rodriguez   +12 more
wiley   +1 more source

Cluster Observations of Plasma in the High Latitude Magnetotail Associated With Cusp‐Aligned Arcs

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract During periods of northward interplanetary magnetic field (IMF), the magnetospheric structure and dynamics are dramatically different compared to the southward IMF case. Previous studies using both observations and simulations have shown that under northward IMF the magnetotail becomes dominated by closed magnetic flux and associated trapped ...
M. K. Mooney, S. E. Milan, M. Lester, I. Dandouras, C. Carr, A. N. Fazakerley   +5 more
wiley   +1 more source

Evolution of Force‐Free Magnetic Structure in the Dayside Ionosphere of Mars

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract Magnetic fields measured in the ionosphere of Mars by the magnetometers onboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) and the Mars Global Surveyor (MGS) spacecraft display a wide range of spatial scales, ranging from global to small‐scale.
T. E. Cravens, O. Hamil, A. R. Renzaglia, S. R. Shaver, S. A. Ledvina, C. S. Kennedy   +5 more
wiley   +1 more source

Effects of Fine Spectral Structure of Chorus Emissions on Nonlinear Scattering and Acceleration of Radiation Belt Electrons

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract Whistler‐mode chorus waves play a crucial role in accelerating electrons in Earth's outer radiation belt to relativistic and ultrarelativistic energies. While this electron evolution is typically modeled using a diffusion approximation for scattering, high‐amplitude chorus waves induce nonlinear resonant effects that challenge this approach on
Miroslav Hanzelka, Yuri Shprits, Dedong Wang, Bernhard Haas, Ondřej Santolík, Longzhi Gan   +5 more
wiley   +1 more source

Limits on the Efficacy of Wave‐Particle Interaction on the Energization and Transport of Atomic and Molecular Heavy Ionospheric Ions

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract Ionospheric molecular ions, such as N2+ ${\mathrm{N}}_{2}^{+}$, NO+, and O2+ ${\mathrm{O}}_{2}^{+}$, have been observed in Earth's high‐altitude ionosphere and the magnetosphere by several spacecraft missions. Their presence not only indicates that they obtain sufficient energy through effective energization mechanisms, predominantly during ...
Mei‐Yun Lin, Raluca Ilie, Alex Glocer
wiley   +1 more source

Modeling Jupiter's Dawnside Magnetodisc: Using Juno Observations to Constrain a Radial Force‐Balance Model

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract This study investigates Jupiter's dawnside magnetodisc, using plasma and magnetic field measurements from Juno orbits 5 to 12 to refine a radial force‐balance magnetodisc model. This iterative vector potential model examines variations in the azimuthal magnetodisc current, coupled with a magnetosphere‐ionosphere coupling model from which the ...
G. Provan, J. D. Nichols, S. W. H. Cowley, F. Bagenal, R. J. Wilson   +4 more
wiley   +1 more source

Impacts Into Titan's Methane‐Clathrate Crust as a Source of Atmospheric Methane

Journal of Geophysical Research: Planets, Volume 130, Issue 4, April 2025.
Abstract Titan is the only icy satellite in the solar system with a dense atmosphere. This atmosphere is composed primarily of nitrogen with a few percent methane, which supports an active, methane‐based hydrological cycle on Titan. The presence of methane, however, is intriguing, as its lifetime is likely much shorter than the age of the solar system ...
S. Wakita, B. C. Johnson, J. M. Soderblom, J. K. Steckloff, A. V. Johnson, C. D. Neish, J. Shah, P. Corlies   +7 more
wiley   +1 more source

Gravity and Radio Science Investigation at the Moons of Uranus to Reveal Subsurface Oceans and Characterize Interior Structures

Journal of Geophysical Research: Planets, Volume 130, Issue 4, April 2025.
Abstract The prospect that the five major moons of Uranus could host subsurface oceans makes them high‐priority targets for future exploration. Different techniques can be used to search for deep oceans in these objects. Here, we focus on ocean detection and characterization from measurements of the moons' response to the gravitational tides and ...
Flavio Petricca, Damon Landau, Mohit Melwani Daswani, Julie Castillo‐Rogez   +3 more
wiley   +1 more source

Fractional Crystallization Scenario for Magma Evolution on Mercury Inferred From Geochemical Variation Around the Caloris Basin

Journal of Geophysical Research: Planets, Volume 130, Issue 4, April 2025.
Abstract The observed geochemical heterogeneity on the surface of Mercury is key to understanding the planet's volcanic activity and mantle conditions. The Caloris basin shows a diversity in elemental composition, spectral properties, and geomorphology, both within and around it.
K. Hirata, T. Usui, E. Caminiti, J. Wright, S. Besse   +4 more
wiley   +1 more source