Results 71 to 80 of about 11,862 (238)

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 ...
William Dunn, J. Ness, L. Lamy, G. Tremblay, G. Branduardi-Raymont, B. Snios, R. Kraft, Z. Yao, A. Wibisono   +8 more
semanticscholar   +1 more source

Constraining the depth of the winds on Uranus and Neptune via Ohmic dissipation [PDF]

Monthly notices of the Royal Astronomical Society, 2020
Determining the depth of atmospheric winds in the outer planets of the Solar system is a key topic in planetary science. We provide constraints on these depths in Uranus and Neptune via the total induced Ohmic dissipation, due to the interaction of the
Deniz Soyuer, F. Soubiran, R. Helled
semanticscholar   +1 more source

Highly Asymmetric Magnetosphere‐Ionosphere‐Thermosphere Coupling at Uranus

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Magnetosphere‐Ionosphere‐Thermosphere (MIT) coupling is widely considered the dominant energy source responsible for maintaining the elevated thermospheric temperatures observed at the giant planets. At Uranus, the strongly tilted and asymmetric magnetic field produces a highly asymmetric magnetospheric configuration that may fundamentally ...
M. Acevski, N. Achilleos, A. Masters, C. Smith, P. I. Tiranti   +4 more
wiley   +1 more source

The Upper Atmosphere of Uranus from Stellar Occultations. II. Revised Temperatures in the Upper Stratosphere and Lower Thermosphere

The Planetary Science Journal
Measurements made by Voyager 2 during its flyby of Uranus in 1986 found warm stratospheric and hot thermospheric temperatures that cannot be explained by solar energy alone.
William R. Saunders, Michael J. Person, Paul Withers, Richard G. French, Chanita Tubthong   +4 more
doaj   +1 more source

Solar Wind Power Likely Governs Uranus' Thermosphere Temperature

Geophysical Research Letters
Observations of Uranus in the near‐infrared by ground‐based telescopes from 1992 to 2018 have shown that the planet's upper atmosphere (thermosphere) steadily cooled from ∼700 to ∼450 K.
A. Masters, J. Szalay, S. Zomerdijk‐Russell, M. Kao   +3 more
semanticscholar   +1 more source

Explaining the low luminosity of Uranus: a self-consistent thermal and structural evolution [PDF]

Astronomy & Astrophysics, 2019
The low luminosity of Uranus is a long-standing challenge in planetary science. Simple adiabatic models are inconsistent with the measured luminosity, which indicates that Uranus is non-adiabatic because it has thermal boundary layers and/or conductive ...
Allona Vazan, R. Helled
semanticscholar   +1 more source

The Complete Life Cycle of Dark Spot NDS‐2018 on Neptune

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract The Hubble Space Telescope collected imaging data spanning the full lifetime of Neptune's dark spot NDS‐2018, which is the sixth large, persistent dark spot seen in the planet's atmosphere. Neptune's dark spots are thought to be anticyclonic vortices, although internal flows have never been directly measured to confirm their rotation. Previous
Michael H. Wong, Raúl Morales‐Juberías, Lawrence Sromovsky, Patrick Fry, Amy A. Simon, Patrick G. J. Irwin, Agustín Sánchez‐Lavega, Ricardo Hueso, Imke de Pater   +8 more
wiley   +1 more source

To Uranus and beyond [PDF]

, 1987
Voyager 2, a sophisticated robotic spacecraft that originally was to fly past Jupiter and Saturn and to last four years, was launched in 1977. Since then it has flown by Uranus and is headed towards Neptune, and still is in contact with spacecraft ...

core  

Uranus Orbiter and Probe: A Radio Science Investigation to Determine the Planet’s Gravity Field, Depth of the Winds, and Tidal Deformations

The Planetary Science Journal
The most recent Planetary Science and Astrobiology Decadal Survey has proposed Uranus as the target for NASA’s next large-scale mission. The interior structure and atmosphere of the planet are currently poorly understood, and objectives for investigating
M. Parisi, A. Friedson, C. Mankovich, M. Hofstadter, A. Akins, Reza Karimi, Damon F. Landau   +6 more
semanticscholar   +1 more source

Effect of non-adiabatic thermal profiles on the inferred compositions of Uranus and Neptune [PDF]

Monthly notices of the Royal Astronomical Society, 2019
It has been a common assumption of interior models that the outer planets of our solar system are convective, and that the internal temperature distributions are therefore adiabatic. This assumption is also often applied to exoplanets.
M. Podolak, R. Helled, G. Schubert
semanticscholar   +1 more source