Results 141 to 150 of about 16,638 (219)

Features in the Visible Spectra of the Enceladus Particle Plume and E Ring: Potential Evidence of Organic Materials and/or Missing Sub‐Micron Particles

Journal of Geophysical Research: Planets, Volume 131, Issue 8, August 2026.
Abstract Visible spectra of the Enceladus particle plume and E ring contain evidence for a change in spectral slope around 0.5 μm. This feature can be seen in data obtained by both the Visual and Infrared Mapping Spectrometer and Imaging Science Subsystem onboard the Cassini Spacecraft, and is consistent with the slope change seen in the surface ...
M. M. Hedman, S. M. MacKenzie
wiley   +1 more source

The Standard New Astronomy Cryostat for SOFIA: A Design for Cryogen-Free Infrared Astronomy [PDF]

, 2013
Astronomy at infrared wavelengths requires optical instruments that operate at low temperatures, which is typically done using liquid cryogens such as nitrogen and helium. These cryogens are costly and limit the operational time of the science instrument.
Burgh, Eric, Scott, Carey F, Ali, Zaheer, Van Cleve, Jeffrey, Daley, earl T, Kashani, Ali   +5 more
core   +1 more source

First Results from WINERED: Detection of Emission Lines from Neutral Iron and a Combined Set of Trace Species on the Dayside of WASP-189 b

The Astronomical Journal
Ground- and space-based observations have revealed that ultrahot Jupiters (UHJs, T _eq  > 2200 K) typically have inverted thermal profiles, while cooler hot Jupiters have noninverted ones.
Lennart van Sluijs, Emily Rauscher, Eliza M.-R. Kempton, Thomas Kennedy, Isaac Malsky, Noriyuki Matsunaga, Michael Meyer, Andrew McWilliam, John D. Monnier, Shogo Otsubo, Yuki Sarugaku, Tomomi Takeuchi   +11 more
doaj   +1 more source

Atmospheric Constituent Data Assimilation in NASA's Goddard Earth Observing System

Earth and Space Science, Volume 13, Issue 8, August 2026.
Abstract Many of today's most significant and urgent scientific questions, including those about the impact of human activity on air quality and radiative forcing, require the synthesis of observations of atmospheric constituents and scientific theory.
B. Weir, K. Wargan, C. A. Keller, K. E. Knowland, P. A. Wales, V. Shah, B. M. Karpowicz, N. Balashov, L. E. Ott, R. Todling, S. E. Cohn, S. Pawson   +11 more
wiley   +1 more source

Infrared Astronomy: More Than Our Eyes Can See Lithograph [PDF]

, 2000
This lithograph uses images of the Orion constellation to illustrate how a common astronomical object appears in both visible light and in the infrared. The back of the lithograph tells the history of infrared light and explains the benefits of infrared ...

core  

Jovian Auroral Proton Precipitation

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The total power of the Jovian aurora is about 1013–1014 W with ultraviolet emission observed in the Lyman and Werner bands of molecular hydrogen. X‐ray, radio, and infrared emissions have also been observed. The Jovian Auroral Distributions Experiment and the Jovian Energetic Particle Detector Instrument onboard the Juno spacecraft, orbiting ...
S. J. Houston, T. E. Cravens, O. Q. Hamil, J. H. Waite, D. R. Schultz   +4 more
wiley   +1 more source

New techniques in astronomical spectroscopy for 8-m telescopes [PDF]

, 1998
The purpose of this thesis is to investigate new instrument technology to enhance the capabilities of 8-m telescopes. This thesis first describes the theory, design, construction, and testing of an immersed grating.
Lee, David, Lee, D.
core  

Emirates Exploration Imager (EXI) Reveals Crater and Boulder Distribution on Deimos: Insights Into Its Dynamical and Geological Evolution

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Deimos, the smaller and outer Martian moon, is a dark, irregularly shaped body whose origin and evolution are still poorly constrained. Its surface is smoother and less cratered than the other moon, Phobos, a difference still unexplained due to limited data coverage and resolution.
Y. Shimizu, R. H. Hoover, K. Hotta, N. R. Alsaeed, W. F. Bottke, C. S. Edwards, H. Kikuchi, H. Miyamoto, M. M. Osterloo, P. Michel, S. J. Robbins   +10 more
wiley   +1 more source

Burned Area Over Africa Reduced by Shortened Dry Season

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract While most of Africa's burned area occurs during the dry season, the relationship between dry season characteristics and fire activity remains poorly understood. This study demonstrates a significant decrease in the length of the African dry season over 1990–2023, primarily contributed by delayed dry season onset in both the Northern (NH) and ...
Sharafaldin Mohammed, Xiyan Xu, Gensuo Jia   +2 more
wiley   +1 more source

Cryogenic Dielectric Metasurface‐Integrated Superconducting Nanowire Single‐Photon Detectors

Nanophotonics, Volume 15, Issue 13, 13 July 2026.
Superconducting nanowire single‐photon detectors (SNSPDs) are the leading technology for single‐photon detection because of their near‐unity system detection efficiency, ultrahigh timing precision, and very low dark counts. However, achieving these performance metrics with single element, small‐active‐area SNSPDs has been an outstanding challenge. Here,
Amir Targholizadeh, Grigoriy Y. Nikulin, Pankaj K. Jha   +2 more
wiley   +1 more source