Results 81 to 90 of about 35,709 (214)

Global Energy Circulation During a Solar Wind Density Pulse

Space Weather, Volume 24, Issue 4, April 2026.
Abstract We study the propagation and impacts of a strong density pulse through the magnetosphere during 11:40–12:00 UT near the peak of a geomagnetic storm on 3 February 2022. Using the Space Weather Modeling Framework Geospace global simulation, we show how the energy transport in the magnetosphere is enhanced promptly after the pulse arrival at the ...
Tuija Pulkkinen, Matti Ala‐Lahti, Austin Brenner, Gábor Tóth, Daniel Welling, Timothy Keebler   +5 more
wiley   +1 more source

Discovery of Millisecond Pulsars toward the Galactic Bulge in an Image-based Survey with MeerKAT

The Astrophysical Journal
We report on the follow-up observations of circularly polarized sources identified in the MeerKAT image-based survey of the Galactic bulge. Using the Parkes radio telescope, we observed 16 circularly polarized sources with the Ultra-Wideband Low receiver
Rahul Sengar, Akash Anumarlapudi, David L. Kaplan, Dale A. Frail, Scott D. Hyman, Emil Polisensky   +5 more
doaj   +1 more source

Impact of distance determinations on Galactic structure. II. Old tracers

, 2018
Here we review the efforts of a number of recent results that use old tracers to understand the build up of the Galaxy. Details that lead directly to using these old tracers to measure distances are discussed.
Bono, G., Braga, V. F., Dall'Ora, M., Ferraro, I., Fiorentino, G., Iannicola, G., Kunder, A., Marconi, M., Martinez-Vazquez, C. E., Monelli, M., Musella, I., Pietrukowicz, P., Ripepi, V., Salaris, M., Sneden, C., Stetson, P. B., Valenti, E.   +16 more
core   +1 more source

Microlensing maps for the galactic bulge [PDF]

The Astrophysical Journal, 1994
Microlensing maps -- that is, contours of equal numbers of events per $10^6$ source stars -- are provided for the inner Galaxy under two alternative hypotheses : (1) the bulge is an oblate axisymmetric spheroid or (2) the bulge is a prolate bar. Oblate spheroids yield a total of $\sim 12$ events per year per $10^6$ stars at Baade's Window ($\sim 15 ...
openaire   +2 more sources

MAVEN Observations of the Martian Magnetospheric Response to Simultaneous Quasi‐Radial Interplanetary Magnetic Field and Low Dynamic Pressure

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract The state of Mars' induced magnetosphere is highly dependent on upstream solar wind conditions. Changes in dynamic pressure alter the locations of magnetospheric boundaries such as the bow shock and induced magnetosphere boundary, while the orientation of the interplanetary magnetic field (IMF) impacts the formation of the bow shock.
K. G. Hanley, S. Xu, C. M. Fowler, C. Mazelle, D. L. Mitchell, J. P. McFadden, J. S. Halekas, L. Andersson, J. Espley, S. M. Curry   +9 more
wiley   +1 more source

The Microlensing Event Rate and Optical Depth from MOA-II 9 Yr Survey Toward the Galactic Bulge

The Astrophysical Journal
We present measurements of the microlensing optical depth and event rate toward the Galactic bulge using the data set from the 2006 to 2014 MOA-II survey, which covers 22 bulge fields spanning ∼42 deg ^2 between −5° 
Kansuke Nunota, Takahiro Sumi, Naoki Koshimoto, Nicholas J. Rattenbury, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Akihiko Fukui, Ryusei Hamada, Shunya Hamada, Naoto Hamasaki, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Tsutsumi Nagai, Greg Olmschenk, Clement Ranc, Yuki K. Satoh, Daisuke Suzuki, Paul. J. Tristram, Aikaterini Vandorou, Hibiki Yama, (MOA collaboration)   +26 more
doaj   +1 more source

Absorption of dark matter by a supermassive black hole at the Galactic center: role of boundary conditions

, 2004
The evolution of the dark matter distribution at the Galactic center is analyzed, which is caused by the combination of gravitational scattering on Galactic bulge stars and absorption by a supermassive black hole at the center of the bulge.
A. Lightman, A. S. Ilyin, A. V. Gurevich, E. A. Vasiliev, M. I. Zelnikov, M. I. Zel’nikov, P. Gondolo, R. Genzel   +7 more
core   +2 more sources

Strong Gravitational Lensing and Galactic Bulges [PDF]

The Astrophysical Journal, 2003
13 pages, 2 figures, the shortened version was accepted by ApJ(Letters)
openaire   +2 more sources

Evolution of Open Magnetic Flux During Substorms: The Effects of Dipole Tilt Angle

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract There is a long‐standing debate on the causes of the semiannual variation of geomagnetic activity. One of the prevailing hypotheses is that the Earth's dipole tilt angle Ψ ${\Psi }$ modulates the dayside reconnection rate, causing the so‐called equinoctial effect. Here we perform the first large‐scale statistical study to test this hypothesis.
A. Nair, L. Holappa, H. Vanhamäki, S. E. Milan   +3 more
wiley   +1 more source

Interstellar extinction towards the inner Galactic Bulge [PDF]

, 1999
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 used to draw an extinction map of the inner Galactic Bulge.
Alard, C., Borsenberger, J., Copet, E., Epchtein, N., Fouque, P., Ganesh, S., Habing, H., Omont, A., Schultheis, M., Simon, G.   +9 more
core   +3 more sources