Results 1 to 10 of about 17,910,893 (248)

Deuterium Isotope Fractionation of Polycyclic Aromatic Hydrocarbons in Meteorites as an Indicator of Interstellar/Protosolar Processing History

Life, 2022
The stable isotope composition of soluble and insoluble organic compounds in carbonaceous chondrites can be used to determine the provenance of organic molecules in space.
Heather V. Graham, Jamie E. Elsila, Jason P. Dworkin, Scott A. Sandford, Jose C. Aponte   +4 more
doaj   +1 more source

Complex gas flows in magnetized protoplanetary disks promote the formation of dust traps at low fragmentation velocities

Astronomy & Astrophysics
Context. Nonideal magnetohydrodynamic (MHD) simulations of protoplanetary disks show a plethora of complex gas structures, including winds, rings, and gaps.
Vaikundaraman Vignesh, Drążkowska Joanna, Gurrutxaga Nerea, Bai Xue-Ning   +3 more
doaj   +1 more source

Diversity of the morphology of type II spicules in MURaM-ChE simulations

Astronomy & Astrophysics
Context. Spicules are ubiquitous, small-scale features in the solar atmosphere, exhibiting a jet-like appearance most clearly identified by their apparent motion in off-limb observations. While they are often interpreted as narrow, thread-like structures,
Chandra Sanghita, Cameron Robert, Przybylski Damien, Solanki Sami K.   +3 more
doaj   +1 more source

Ozone chemical equilibrium near the Martian nighttime OH* layer: observational constraints

Earth, Planets and Space
Simultaneous measurements of ozone concentrations and vibrationally excited hydroxyl (OH*) emissions provide a method for determining atomic oxygen (O) and atomic hydrogen (H) concentrations, which are otherwise difficult to measure directly.
Dmitry S. Shaposhnikov, Paul Hartogh, Gerd Reinhold Sonnemann, Mykhaylo Grygalashvyly   +3 more
doaj   +1 more source

Research on Multi-Scenario Variable Parameter Energy Management Strategy of Rural Community Microgrid

Applied Sciences, 2020
Many rural communities in western China use renewable energy-based clean energy supply methods, and the community microgrid system of “photovoltaic + energy storage + electric heating” has been widely used. However, the energy management effect of such a
Lidong Guo, Zilong Yang, Yibo Wang, Honghua Xu   +3 more
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Establishment, Validation, and Application of a Comprehensive Thermal Hydraulic Model for a Parabolic Trough Solar Field

Energies, 2019
To better understand the thermal hydraulic characteristics of the parabolic trough solar field (PTSF), a comprehensive thermal hydraulic model (CTHM) based on a pilot plant is developed in this paper.
Linrui Ma, Zhifeng Wang, Dongqiang Lei, Li Xu   +3 more
doaj   +1 more source

Influence of gravity waves on the climatology of high-altitude Martian carbon dioxide ice clouds [PDF]

Annales Geophysicae, 2018
Carbon dioxide (CO2) ice clouds have been routinely observed in the middle atmosphere of Mars. However, there are still uncertainties concerning physical mechanisms that control their altitude, geographical, and seasonal distributions.
E. Yiğit, A. S. Medvedev, P. Hartogh
doaj   +1 more source

Ceres: Organic‐Rich Sites of Exogenic Origin?

AGU Advances
Ceres, the largest object in the asteroid belt, is the only potential ocean world in the inner Solar System. Previous studies identified deposits of aliphatic organics in and around the Ernutet crater, and at small locations at Inamahari and Urvara ...
R. Sarkar, A. Nathues, M. Hoffmann, E. Cloutis, K. Mengel, P. Singh, G. Thangjam, J. Hernandez, S. Karunatillake, M. Coutelier   +9 more
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Cyclic sunspot activity during the first millennium CE as reconstructed from radiocarbon

Astronomy & Astrophysics
Context. Solar activity, dominated by 11-year cyclic evolution, has been observed directly since 1610 CE. Indirect cosmogenic proxy data have been used to reconstruct solar activity for millennia prior to 1610.
Usoskin I., Solanki S. K., Krivova N. A., Chatzistergos T.   +3 more
doaj   +1 more source

Thermodynamic and magnetic evolution of an eruptive C-class solar flare observed with SST/TRIPPEL-SP

Astronomy & Astrophysics
Solar flares are complex phenomena driven by the release of magnetic energy, but a large energy reservoir is not sufficient to determine their eruptive potential; the magnetic topology and plasma dynamics play a key role.
Díaz Baso C. J., de la Cruz Rodríguez J., Doerr H.-P., van Noort M., Prasad A., Feller A., Kiselman D.   +6 more
doaj   +1 more source