Results 41 to 50 of about 126,365 (213)

Theta Aurora: Transpolar Arcs Linked to a Folded Magnetotail Neutral Sheet

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Nightside‐originating transpolar arcs (TPAs) represent a distinct mechanism of magnetosphere‐ionosphere energy transfer during northward IMF conditions. Nightside‐originating TPAs originate from the nightside auroral oval and grow across the polar cap to connect to the dayside, appearing to cross multiple topological boundaries as they develop.
S. C. Hill, T. I. Pulkkinen, A. Kullen, A. Brenner, M. Ala‐Lahti, Q. Al Shidi, A. Mukhopadhyay, S. Zou, M. Liemohn, A. N. Jaynes   +9 more
wiley   +1 more source

The location and kinematics of the emission line regions in Active Galactic Nuclei [PDF]

, 2008
This thesis contains the results from a study of the optical emission lines of various samples of active galactic nuclei (AGN). We have used three separate techniques to determine the precise kinematics and the relative location of the emission line ...
Mullaney, J R, Mullaney, J.R.
core  

Neutral Wind Dynamics in High‐Latitude Regions During the 17 March 2013 Storm

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Neutral winds play a critical role in transporting mass, momentum, and energy throughout the upper atmosphere. During geomagnetic storms, momentum is transferred to the thermosphere primarily through ion–neutral collisions, along with other forces. This study investigates high‐latitude neutral wind dynamics during the 17 March 2013 storm using
A. Alhothali, A. J. Ridley, M. Akhavan‐Tafti   +2 more
wiley   +1 more source

Interstellar extinction towards the inner Galactic Bulge [PDF]

, 1999
4 pages, 4 figures, accepted for publication in A&A as a letter, see also http://www-denis.iap.fr/articles/extinction/DENIS observations in the J (1.2 micron) and K_S (2.15 micron) bands together with isochrones calculated for the RGB and AGB phase are ...
Simon, Grégory, Fouque, P., Omont, A., Borsenberger, J., Copet, E., Schultheis, M., Epchtein, N., Ganesh, S., Alard, C., Habing, H.   +9 more
core   +2 more sources

Composition of Giants 1° North of the Galactic Center: Detailed Abundance Trends for 21 Elements Observed with IGRINS

The Astrophysical Journal
We report the first high-resolution, detailed abundances of 21 elements for giants in the Galactic bulge/bar within 1° of the Galactic plane, where high extinction has rendered such studies challenging. Our high-signal-to-noise-ratio and high-resolution,
Govind Nandakumar, Nils Ryde, Gregory Mace, Kyle F. Kaplan, Niels Nieuwmunster, Daniel Jaffe, R. Michael Rich, Mathias Schultheis, Oscar Agertz, Eric Andersson, Christopher Sneden, Emily Strickland, Brian Thorsbro   +12 more
doaj   +1 more source

Dislocation Bands and Subboundaries in Experimentally Deformed Olivine

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract Transmission electron microscopy imaging of dislocations in olivine indicates heterogeneous structures and diversity of dislocation types. However, the volumes imaged at high resolution are smaller than individual grains even of fine‐grained samples.
Ulrich Faul
wiley   +1 more source

An HST Wide-field Survey of the Galactic Bulge: Overview, Strategy, and First Results

The Astrophysical Journal Letters
We present a Hubble Space Telescope (HST) imaging survey of a 1.1 deg ^2 sky area toward the Milky Way Galactic bulge. This field significantly overlaps with the upcoming Nancy Grace Roman Galactic Bulge Time Domain Survey.
Sean K. Terry, Jay Anderson, Charles A. Beichman, David P. Bennett, Aparna Bhattacharya, Jean-Philippe Beaulieu, B. Scott Gaudi, Joel Green, Macy J. Huston, Jessica R. Lu, Ray A. Lucas, David M. Nataf, Matthew T. Penny, Natalia E. Rektsini, Carolina Rodriguez Sanchez-Vahamonde, Aikaterini Vandorou   +15 more
doaj   +1 more source

A near-infrared stellar atlas of the Galactic plane from the VVVX survey

Astronomy & Astrophysics
Context. The VISTA Variables in the Via Lactea eXtended (VVVX) ESO public survey observed the Galactic plane and the outer Galactic bulge in the near-infrared to mitigate the effects of extinction that severely limit optical observations of these regions.
Alonso-García Javier, Hempel Maren, Saito Roberto K., Minniti Dante, Cross Nicholas J. G., Anais Jorge, Borissova Jura, Catelan Márcio, Fernández-Trincado José G., Garro Elisa R., Guo Zhen, Lucas Philip W., Navarro María G., Obasi Casmir O., Smith Leigh C.   +14 more
doaj   +1 more source

Visible and Near Infrared (VNIR) Spectroscopy to Decipher Glass and Crystal Content of Lab‐Made Martian Volcanic Analogs

Journal of Geophysical Research: Planets, Volume 131, Issue 8, August 2026.
Abstract Understanding how the glass/crystal ratio influences the spectral response of volcanic rocks is crucial for interpreting planetary remote sensing data. Here, four mafic rocks simulating a possible Martian composition were synthesized with identical bulk chemistry but different mineralogical assemblages, from fully amorphous to ∼70 wt.% crystal
Alessandro Pisello, Maximiliano Fastelli, Marco Baroni, Alessandro Musu, Bernard Schmitt, Olivier Poch, Pierre Beck, Maurizio Petrelli, Massimiliano Porreca, Azzurra Zucchini, Paola Comodi, Diego Perugini   +11 more
wiley   +1 more source

Dynamics of the galactic bulge-bar

AIP Conference Proceedings, 1992
The non‐circular velocities of gas in the inner few degrees of our Galaxy would arise naturally if the Milky Way had a small bar at its center. Recent studies suggest that this bar is more rapidly rotating than had been previously suggested; corotation probably lies near R=2.4 kpc. The circular speed associated with the Galaxy’s monopole component must
Binney, J, Gerhard, O
openaire   +2 more sources