Results 81 to 90 of about 31,252 (251)
The Planetary Science Journal, 2023 We measured the chemical composition of comet C/2021 A1 (Leonard) using the long-slit echelle grating spectrograph iSHELL/IRTF on 2021 December 20 and on 2022 January 8 and 9.
Sara Faggi +3 more
doaj +1 more source
Nitrogen hydrides in interstellar gas: Herschel/HIFI observations towards G10.6-0.4 (W31C) [PDF]
, 2010 The HIFI instrument on board the Herschel Space Observatory has been used to observe interstellar nitrogen hydrides along the sight-line towards G10.6−0.4 in order to improve our understanding of the interstellar chemistry of nitrogen.
Bell, T. A. +6 more
core
Gas-grain models for interstellar anion chemistry
, 2012 Long-chain hydrocarbon anions CnH- (n=4, 6, 8) have recently been found to be abundant in a variety of interstellar clouds. In order to explain their large abundances in the denser (prestellar/protostellar) environments, new chemical models are ...
Brown +33 more
core +1 more source
Space Weather, Volume 24, Issue 5, May 2026.Abstract We report new measurements of high‐energy protons ejected by the sun during the May 2024 Ganon superstorm. Our observations were made by the Neutron Spectrometer (NS) on the Psyche spacecraft, which was located at a solar distance of approximately 2 AU and a Sun‐Earth‐Probe separation angle of 75°.
Madison Liebel +3 more
wiley +1 more source
Silicon chemistry in interstellar clouds [PDF]
Interstellar SiO was discovered shortly after CO but it has been detected mainly in high density and high temperature regions associated with outflow sources.
Glassgold, A. E., Langer, William D.
core +1 more source
The interstellar gas-phase chemistry of HCN and HNC
, 2014 We review the reactions involving HCN and HNC in dark molecular clouds to elucidate new chemical sources and sinks of these isomers. We find that the most important reactions for the HCN-HNC system are Dissociative Recombination (DR) reactions of HCNH ...
Hickson, Kevin M. +2 more
core +3 more sources
Extreme Value Analysis of Solar Green‐Line Corona During the Time Interval 1939–2025
Space Weather, Volume 24, Issue 5, May 2026.Abstract Predicting the probability of extreme solar events is critical to understanding how to mitigate risks associated with space weather disasters, as their occurrence can pose a threat to life and infrastructure on Earth or in near‐Earth orbit. In the present study, extreme value theory is applied to the daily modified coronal index (MCI) for the ...
Miao Wan +6 more
wiley +1 more source
Chemistry on interstellar grains
Journal of Physics: Conference Series, 2005 In this review, our current knowledge of the chemistry that occurs on cold interstellar grain surfaces is examined. The formation of molecular hydrogen from hydrogen atoms is emphasized. Various methods of modeling diffusive reactions on grain surfaces are illustrated, including the rate equation method, and two basic stochastic approaches. The results
E Herbst, Q Chang, H M Cuppen
openaire +1 more source
Superaromatics: The key to a unified cosmic dust theory [PDF]
The theory of Superaromatics, the key to a unified cosmic dust theory, was constructed by analyzing several thousand astronomical features covering every major aspect of astrophysics and astrochemistry relating to dust.
Manuel, Lawrence R.
core +1 more source
Clouds, Clumps, Cores & Comets - a Cosmic Chemical Connection?
, 2008 We discuss the connection between the chemistry of dense interstellar clouds and those characteristics of cometary matter that could be remnants of it. The chemical evolution observed to occur in molecular clouds is summarized and a model for dense core ...
Charnley, S. B., Rodgers, S. D.
core +2 more sources