Results 51 to 60 of about 2,349 (186)

Stormtime Magnetospheric Processes Associated With the Dawnside Current Wedge

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract The intensification of the westward auroral electrojet (AEJ) in the dawn sector is a characteristic feature of the storm main phase. It is considered an ionospheric segment of a wedge‐type current system, the dawnside current wedge (DCW), formed by the disruption (short‐circuiting through the ionosphere) of a magnetospheric equatorial current.
S. Ohtani, S. Raptis, A. P. Devanandan, T. Motoba, Y. Zou, J. W. Gjerloev, V. G. Merkin   +6 more
wiley   +1 more source

Light-curve Recovery with Rubin-LSST. II. Unveiling the Darkness of the Galactic Bulge (VESTALE) with RR Lyrae

The Astrophysical Journal Supplement Series
This work is part of VESTALE, a project initiated within the Legacy Survey of Space and Time (LSST) Cadence Strategy Optimization Process. Its goal is to explore the potential of Rubin-LSST observations aimed at the Galactic bulge (henceforth just “Bulge”
M. Di Criscienzo, S. Leccia, V. Braga, I. Musella, G. Bono, M. Dall’Ora, G. Fiorentino, M. Marconi, R. Molinaro, V. Ripepi, L. Girardi, A. Mazzi, G. Pastorelli, M. Trabucchi, N. Matsunaga, M. Monelli, A. Saha, K. A. Vivas, R. Zanmar Sanchez   +18 more
doaj   +1 more source

Investigating Geomagnetic Disturbances in the Expansion Phase of Strong Substorms

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract This study contributes to improved space weather forecasting by investigating geomagnetic disturbances (GMDs) associated with rapid decreases in the SuperMAG Auroral Electrojet Lower (SML) index during strong substorms (SML < ${< } $ −500 nT) at high latitudes (64° ${}^{\circ}$–75° ${}^{\circ}$ MLAT).
Sanjay Kumar, Mark B. Moldwin, James M. Weygand, M. J. Engebretson   +3 more
wiley   +1 more source

Chemical Evolution of Bulges of Active Galactic Nuclei in the Early Universe: Roles of Accreting Stars

The Astrophysical Journal
JWST/NIRCam observations reveal dense stellar cores in high-redshift galactic bulges, indicative of sustained star formation and potential stellar accretion.
Shuo Zhai, Jian-Min Wang, Yan-Rong Li, Wei-jian Guo, Gang Zhao   +4 more
doaj   +1 more source

Characteristics of Helium Bulges and the Impact of Martian Year 34 Global Dust Storm Using MAVEN/NGIMS Observations and MarsPCM and MGITM Simulations

Journal of Geophysical Research: Planets, Volume 130, Issue 12, December 2025.
Abstract We investigate spatiotemporal characteristics of helium (He) bulges using data from the Neutral Gas and Ion Mass Spectrometer aboard NASA's Mars Atmosphere and Volatile EvolutioN Mission and numerical simulations from the Mars Planetary Climate Model (MarsPCM). During equinoxes, we observed a He bulge at equatorial latitudes in addition to the
Neha Gupta, Bijay Kumar Guha, Claus Gebhardt, Shaikha Al Dhaheri, Stephen Bougher, Roland M. B. Young, Ehouarn Millour, Luca Montabone, N. V. Rao, Piyush Sharma   +9 more
wiley   +1 more source

Learning the Universe: GalactISM Simulations of Resolved Star Formation and Galactic Outflows across Main-sequence and Quenched Galactic Environments

The Astrophysical Journal
We present a suite of six high-resolution chemodynamical simulations of isolated galaxies, spanning observed disk-dominated environments on the star-forming main sequence, as well as quenched, bulge-dominated environments.
Sarah M. R. Jeffreson, Eve C. Ostriker, Chang-Goo Kim, Jindra Gensior, Greg L. Bryan, Timothy A. Davis, Lars Hernquist, Sultan Hassan   +7 more
doaj   +1 more source

Inner galactic disc metallicity distributions and the bulge-disc relation

EPJ Web of Conferences, 2012
The intermediate-to-old population of the inner galactic disk remains a relatively uncharted territory. We present the results of a high resolution spectroscopic survey of over 200 red clump stars in the inner galactic disc (3–5 kpc from the galactic ...
Haywood M., Gómez A., Babusiaux C., Hill V., Katz D., Royer F.   +5 more
doaj   +1 more source

3D Petro‐Structural Evolution of the High Pressure‐Low Temperature Phyllite‐Quartzite Nappe Pile in Southern Peloponnese, Greece

Tectonics, Volume 44, Issue 12, December 2025.
Abstract Tectonic underplating of high‐pressure/low‐temperature (HP‐LT) tectonic slices is a key mechanism in crustal growth at convergent margins. Yet, the processes controlling the geometry, depth and sequence of underplating events remain poorly constrained.
Maïlys Bouhot, Armel Menant, Clément Ganino, Samuel Angiboust, Onno Oncken, Laurent Jolivet, Damien Deldicque, Nikolaos Skarpelis, François Orange   +8 more
wiley   +1 more source

Nucleosynthesis of Cobalt and Copper

Galaxies
Chemical abundances of cobalt (Co; Z = 27) and copper (Cu; Z = 29) in bulge and halo stars are presented and compared with chemical evolution models.
Beatriz Barbuy, Amâncio C. S. Friaça, Heitor Ernandes   +2 more
doaj   +1 more source

Dark Atoms and the Positron-Annihilation-Line Excess in the Galactic Bulge

Advances in High Energy Physics, 2014
It was recently proposed that stable particles of charge −2, O--, can exist and constitute dark matter after they bind with primordial helium in O-helium (OHe) atoms.
J.-R. Cudell, M. Yu. Khlopov, Q. Wallemacq   +2 more
doaj   +1 more source