Results 41 to 50 of about 34,434 (269)

Uranus and Neptune: Shape and Rotation [PDF]

, 2010
Both Uranus and Neptune are thought to have strong zonal winds with velocities of several hundred meters per second. These wind velocities, however, assume solid-body rotation periods based on Voyager 2 measurements of periodic variations in the planets'
Anderson, Desch, French, French, Gerald Schubert, Gurnett, Gurnett, Hammel, Hammel, Helled, Helled, Hubbard, Hubbard, John D. Anderson, Kaula, Lindal, Lindal, Lindal, Lodders, Millis, Ness, Ness, Ravit Helled, Read, Smith, Sromovsky, Stacey, Warwick, Warwick, Zharkov   +29 more
core   +1 more source

Atmospheric chemistry on Uranus and Neptune. [PDF]

Philos Trans A Math Phys Eng Sci, 2020
Comparatively little is known about atmospheric chemistry on Uranus and Neptune, because remote spectral observations of these cold, distant ‘Ice Giants’ are challenging, and each planet has only been visited by a single spacecraft during brief flybys in
Moses JI, Cavalié T, Fletcher LN, Roman MT.   +3 more
europepmc   +3 more sources

Magnetopause Reconnection Voltages During the Voyager 2 Flyby of Uranus

Geophysical Research Letters, Volume 52, Issue 22, 28 November 2025.
Abstract Uranus' magnetosphere presents a unique system to examine global magnetic reconnection processes due to its location far from the Sun. We assess reconnection effectiveness during Voyager 2's Uranus flyby, using a physics‐based analytical model to calculate reconnection voltages applied to the magnetopause.
Sophia Zomerdijk‐Russell, J. M. Jasinski   +1 more
openalex   +2 more sources

Long-term observations of Uranus and Neptune at 90 GHz with the IRAM 30m telescope - (1985 -- 2005) [PDF]

, 2008
The planets Uranus and Neptune with small apparent diameters are primary calibration standards. We investigate their variability at ~90 GHz using archived data taken at the IRAM 30m telescope during the 20 years period 1985 to 2005.
A. Greve, C. Kramer, Greve, Greve, Greve, Griffin, Hofstadter, Klein, Lindal, Lindal, Moreno, R. Moreno, Reuter, Reuter, Sanchez Contreras, Sandell, Steppe, Steppe, Steppe, Ulich   +19 more
core   +2 more sources

Uranus and Neptune: Origin, Evolution and Internal Structure [PDF]

Space Science Reviews, 2019
There are still many open questions regarding the nature of Uranus and Neptune, the outermost planets in the Solar System. In this review we summarize the current-knowledge about Uranus and Neptune with a focus on their composition and internal structure,
R. Helled, N. Nettelmann, T. Guillot
semanticscholar   +1 more source

The Deep Composition of Uranus and Neptune from In Situ Exploration and Thermochemical Modeling [PDF]

Space Science Reviews, 2020
The distant ice giants of the Solar System, Uranus and Neptune, have only been visited by one space mission, Voyager 2. The current knowledge on their composition remains very limited despite some recent advances.
T. Cavali'e, O. Venot, Y. Miguel, L. Fletcher, P. Wurz, O. Mousis, R. Bounaceur, V. Hue, J. Leconte, M. Dobrijevic   +9 more
semanticscholar   +1 more source

Uranus’s and Neptune’s Stratospheric Water Abundance and Vertical Profile from Herschel-HIFI

The Planetary Science Journal, 2022
Here we present new constraints on Uranus’s and Neptune’s externally sourced stratospheric water abundance using disk-averaged observations of the 557 GHz emission line from Herschel’s Heterodyne Instrument for the Far-Infrared.
N. A. Teanby, P. G. J. Irwin, M. Sylvestre, C. A. Nixon, M. A. Cordiner   +4 more
doaj   +1 more source

Evidence of a Polar Cyclone on Uranus From VLA Observations

Geophysical Research Letters, 2023
We present observations of Uranus in northern spring with the Very Large Array from 0.7 to 5 cm. These observations reveal details in thermal emission from Uranus' north pole at 10s of bars, including a dark collar near 80°N and a bright spot at the ...
Alex Akins, Mark Hofstadter, Bryan Butler, A. James Friedson, Edward Molter, Marzia Parisi, Imke dePater   +6 more
doaj   +1 more source

Linking Uranus’ temperature profile to wind-induced magnetic fields [PDF]

Monthly notices of the Royal Astronomical Society, 2021
The low luminosity of Uranus is still a puzzling phenomenon and has key implications for the thermal and compositional gradients within the planet. Recent studies have shown that planetary volatiles become ionically conducting under conditions that are
Deniz Soyuer, R. Helled
semanticscholar   +1 more source

A Low Signal Detection of X‐Rays From Uranus

Journal of Geophysical Research: Space Physics, 2021
Within the solar system, X‐ray emissions have been detected from every planet except the Ice Giants: Uranus and Neptune. We analyze the three archival Chandra X‐ray observations of Uranus (each 24–30 ks duration) to date: a stand‐alone Advanced CCD ...
W. Dunn, J. Ness, L. Lamy, G. Tremblay, G. Branduardi‐Raymont, B. Snios, R. Kraft, Z. Yao, A. Wibisono   +8 more
semanticscholar   +1 more source