Steady Collapse of Uranus' Exosphere After 1998 to the Present Decade
Geophysical Research LettersUranus' thermospheric temperature decreased from ∼800K in 1986 to ∼450K in 2022 as determined from observations of H3+ and H2 infrared emissions. Spitzer 2007 lower atmosphere observations do not emulate this cooling trend. Here we show that the atomic H
D. Bhattacharyya +6 more
doaj +2 more sources
From Methane to Nanodiamond Precursors in Water: Superacid-like Condensation Pathways Under Extreme Conditions. [PDF]
Angew Chem Int Ed EnglUnder extreme pressure and temperature, superionic water acts as a strong superacid, catalyzing methane polycondensation through pentacoordinated carbonium ions (CH5+). This discovery reveals the non‐classical carbocation chemistry underlying the early stages of diamond formation in water under extreme conditions.
Thévenet T +6 more
europepmc +3 more sources
Fast Ultra-Selective <sup>1</sup>H-<sup>15</sup>N 1D NMR Spectroscopy Unlocks Atom-Resolved Dynamics of Low-Complexity Protein Regions. [PDF]
Angew Chem Int Ed EnglNMR 15N spin‐relaxation rates are a primary source of information for deciphering protein conformational dynamics, but they require unreasonable experimental times when their 1H‐15N 2D spectra are highly congested. We propose an ultra‐selective method, SNIPER, that greatly accelerates data collection of individual residues. This allows characterization
Adamski W +3 more
europepmc +2 more sources
Pressure‐Induced sp 2 ‐sp 3 Transitions in Carbon‐Bearing Phases
Geophysical Monograph Series, Page 1-9., 2020 This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.
Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions
Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Sergey S. Lobanov +1 more
wiley +1 more source
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 +19 more
core +2 more sources
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 +4 more
doaj +1 more source
Does Uranus' Asymmetric Magnetic Field Produce a Relatively Weak Proton Radiation Belt?
Geophysical Research Letters, 2022 Since the Voyager 2 flyby in 1986 the radiation belts of Uranus have presented a problem for physicists. The observations indicate the electron radiation belt is far more intense than the proton radiation belt, and while the electron intensities are ...
A. Masters, C. Ioannou, N. Rayns
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 +6 more
doaj +1 more source
Fast E-sail Uranus entry probe mission [PDF]
, 2014 The electric solar wind sail is a novel propellantless space propulsion concept. According to numerical estimates, the electric solar wind sail can produce a large total impulse per propulsion system mass.
Janhunen, Pekka +5 more
core +3 more sources
Pitch-angle diffusion coefficients from resonant interactions with electrostatic electron cyclotron harmonic waves in planetary magnetospheres [PDF]
Annales Geophysicae, 2011 Pitch-angle diffusion coefficients have been calculated for resonant interaction with electrostatic electron cyclotron harmonic (ECH) waves in the magnetospheres of Earth, Jupiter, Saturn, Uranus and Neptune.
A. K. Tripathi +2 more
doaj +1 more source