Results 161 to 170 of about 89,220 (323)
Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.Abstract The Solar, Anomalous, and Magnetospheric Explorer (SAMPEX) mission launched in July 1992 was the first NASA “Small Explorer” project. It had the goal to show how space missions could be developed much more rapidly than had become the situation in the 1980s and 1990s.
D. N. Baker, G. M. Mason
wiley +1 more source
The Astrophysical JournalWe present a comprehensive analysis of the extended emission-line region (EELR) in the host galaxy of the tidal disruption event (TDE) AT2019qiz, utilizing Very Large Telescope (VLT)/MUSE integral-field spectroscopy.
Yifei Xiong +4 more
doaj +1 more source
AnASCAObservation of M51 (NGC 5194): Iron K Emission from an Obscured Active Galactic Nucleus [PDF]
, 1998 Yuichi Terashima +6 more
openalex +1 more source
A History of UNAVCO: Four Decades of Advancing Geodesy
Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.Abstract UNAVCO was a university‐governed consortium funded by the National Science Foundation (NSF), with support from the National Aeronautics and Space Administration (NASA) and the United States Geological Survey (USGS), to support geoscience research and education using geodesy.
Emily E. Zawacki +4 more
wiley +1 more source
Fourier-phase analysis of the orbiting bright-spot model for active galactic nucleus variability [PDF]
, 1997 V. Karas
openalex +1 more source
Proton‐linked effects on the axial coordination in ferric and ferrous horse heart cytochrome c
Protein Science, Volume 34, Issue 11, November 2025.Abstract The effect of pH (between pH 7.0 and 0.0) on the spectroscopic properties of ferric and ferrous derivatives of horse heart cytochrome c (hhcytc‐Fe(III) and hhcytc‐Fe(II), respectively) in 1.0M phosphate buffer is reported. This study further deepens the investigation of spectroscopic properties of a heme‐protein to very low pH (i.e., pH ≈ 0 ...
Federico Sebastiani +8 more
wiley +1 more source
A Reverberation Mapping Study of a Highly Variable Active Galactic Nucleus 6dFGS gJ022550.0-060145
The Astrophysical JournalWe use LCOGT observations (MJD 59434−59600) with a total exposure time of ≃50 hr and a median cadence of 0.5 day to measure the interband time delays (with respect to u ) in the g , r , and i continua of a highly variable active galactic nucleus (AGN ...
Danyang Li +4 more
doaj +1 more source
Journal of Geophysical Research: Atmospheres, Volume 130, Issue 20, 28 October 2025.Abstract This study examined spatiotemporal variations in Beryllium‐7 (7Be) concentrations measured in surface air in high‐latitude regions of the Indian sector of the Southern Ocean, including two Japanese coastal stations. The sites included Syowa Station (69°00′S, 39°35′E) and site S17 (69°02′S, 40°05′E) on the coastal Antarctic ice sheet ...
Naohiko Hirasawa +5 more
wiley +1 more source
Iron K Line Variability in the Low-Luminosity Active Galactic Nucleus NGC 4579 [PDF]
, 2000 Yuichi Terashima +6 more
openalex +1 more source
Microlensing and the structure of active galactic nucleus accretion disks
The Astrophysical Journal, 1991 Rapid variability has been reported in two of the four gravitationally lensed images of Q2237 + 0305, and this is attributed to microlensing caused by the intervening stars. The associated constraints on the source size and properties are studied and compared with a variety of stationary accretion disk models.
Roger Blandford, Kevin P. Rauch
openaire +2 more sources