Results 41 to 50 of about 33,443 (166)

The Extreme-ultraviolet Precursors and Postcursors of Solar Flares

The Astrophysical Journal
EUV brightenings are small-scale magnetic reconnection events that consistently appear before and after solar flares. However, it is not well understood how EUV precursors might foreshadow flares and what the physical connection is between the EUV ...
Larisza D. Krista
doaj   +1 more source

X-ray Insights Into Interpreting CIV Blueshifts and Optical/UV Continua

, 2004
We present 0.5-8.0 keV Chandra observations of six bright quasars that represent extrema in quasar emission-line properties -- three quasars each with small and large blueshifts of the CIV emission line with respect to the systemic redshift of the ...
Bouchet P., Daniel E. Vanden Berk, Donald P. Schneider, Francis P. J., Gordon T. Richards, Krolik J. H., Patrick B. Hall, Puchnarewicz E. M., S. C. Gallagher, W. N. Brandt, Wilkes B. J.   +10 more
core   +2 more sources

Hot Horizontal-Branch Stars: The Ubiquitous Nature of the "Jump" in Stromgren u, Low Gravities, and the Role of Radiative Levitation of Metals [PDF]

, 1999
A "jump" in the BHB distribution in the V, u-y CMD was recently detected in the GC M13.
Bell R. A., Bonifacio P., Borissova J., Brocato E., Buonanno R., Cacciari C., Caldwell S. P., Caloi V., Caloi V., Caloi V., Caputo F., Castelli F., Catelan M., Cavallo R. M., de Boer K. S., Denissenkov P. A., F. Grundahl, Gratton R. G., Hatzes A. P., Heber U., Jorgensen U. G., Kilkenny D., Klochkova V. G., Lanz T., Lee S.-W., Leone F., M. Catelan, M. I. Andersen, Mironov A. V., Moehler S., Moehler S., Moehler S., Mould J., Olsen E. H., Olsen E. H., Oosterhoff P. Th., P. B. Stetson, Schuster W. J., Shetrone M. D., Suntzeff N. B., Vink J. S., W. B. Landsman   +41 more
core   +2 more sources

Probing the Influence of Sulfur–Aromatic Interactions on the Electronic Structure of Gas‐Phase Peptides

Chemistry – A European Journal, EarlyView.
Just as fingerprints reveal identity, spectroscopic fingerprints reveal molecular secrets. In this article, we show parts of the unique fingerprint of the sulfur–aromatic interaction. By measuring how this force alters the electronic structure of gas‐phase peptides, we provide a fundamental understanding of interactions that give insights into the ...
Laura Pille, Carlos Ortiz‐Mahecha, Bart Oostenrijk, Juliette Leroux, Marion Girod, Konstantin Hirsch, Luke MacAleese, Robert Horst Meißner, Debora Scuderi, Isaak Unger, Vicente Zamudio‐Bayer, Sadia Bari, Lucas Schwob   +12 more
wiley   +1 more source

Detecting Solar Flare Precursors Using DEFT

The Astrophysical Journal
The Detection and EUV Flare Tracking (DEFT) tool automatically identifies flare precursors in extreme ultraviolet (EUV) observations in a fast and consistent manner, with minimal computational overhead. DEFT currently uses GOES/SUVI 304 Å observations to
Larisza D. Krista
doaj   +1 more source

Designing chiral organic small molecules for circularly polarized light detection via group theory

InfoMat, EarlyView.
The chiral point group determines the arrangement of the μ‐m of chiral organic small molecules, thereby influencing their chiral photoelectric properties. In particular, chiral molecules with the D2 point group can effectively align the μ‐m to be either 0° or 180°, an effective strategy for high‐performance circularly polarized light photodetectors ...
Zhenping Li, Wenkai Zhao, Jiajun Fu, Wenhan Wu, Xingshuo Chu, Zihao Xu, Yu‐Wu Zhong, Hao‐Li Zhang, Wei Ma, Guankui Long, Xiaobo Shang   +10 more
wiley   +1 more source

Simulations of Coronal Mass Ejections on a Young Solar-type Star and Their Detectability Through Coronal Spectral Observations

The Astrophysical Journal
There is a growing interest in searching for coronal mass ejections (CMEs) in other stellar systems, because they are thought to be one of the important factors shaping planetary atmospheres.
Yu Xu, Hui Tian, Julián D. Alvarado-Gómez, Jeremy J. Drake, Gustavo Guerrero   +4 more
doaj   +1 more source

Overview of the Far Ultraviolet Spectroscopic Explorer Mission [PDF]

, 2000
The Far Ultraviolet Spectroscopic Explorer satellite observes light in the far-ultraviolet spectral region, 905 - 1187 A with high spectral resolution.
A. F. Davidsen, A. G. Michalitsianos, A. J. Willis, A. K. Dupree, A. N. Cha, A. Vidal-Madjar, A. W. Fullerton, B-G Andersson, B. D. Savage, B. E. Woodgate, B. Y. Welsh, Broadfoot A. L., C. Gry, C. L. Morbey, C. Oliveira, D. G. York, D. J. Sahnow, D. K. McCarthy, D. Mark, E. B. Jenkins, E. M. Murphy, E. Wilkinson, G. A. Gaines, G. A. Kriss, G. Hebrard, G. Sonneborn, Grange R., H. A. Weaver, H. W. Moos, J. B. Hutchings, J. C. Green, J. L. Linsky, J. M. Shull, J. P. Andrews, J. W. Kruk, K. R. Brownsberger, K. R. Sembach, L. Bianchi, L. L. Cowie, M. A. Gummin, M. Saisse, O. H. W. Siegmund, P. Chayer, P. D. Feldman, R. F. Green, R. F. Malina, R. G. Ohl, R. Grange, R. H. Barkhouser, R. Murowinski, S. D. Friedman, S. J. Conard, S. N. Osterman, T. B. Ake, T. P. Snow, W. C. Cash, W. P. Blair, W. R. Oegerle, W. Zheng   +58 more
core   +2 more sources

Methods for substituting onsite ambient ultraviolet radiation measurements for personal exposure studies

Photochemistry and Photobiology, EarlyView.
Three methods for substituting on‐site ambient ultraviolet radiation measurements for personal exposure measurements were investigated. Assuming spatial persistency of measurements from high‐grade instruments delivers lowest uncertainties up to distances of 82 km.
F. Lubitz, S. Helletzgruber, H. Danhel, D. Radmanovac, A. Dzwonek, E. Kitz, P. Weihs, A. W. Schmalwieser   +7 more
wiley   +1 more source

Reconstruction of Solar Extreme-ultraviolet Irradiance Using Ca II K Images and SOHO/SEM Data with Bayesian Deep Learning and Uncertainty Quantification

The Astrophysical Journal Supplement Series
Solar extreme-ultraviolet (EUV) irradiance plays a crucial role in heating the Earth’s ionosphere, thermosphere, and mesosphere, affecting atmospheric dynamics over varying time scales.
Haodi Jiang, Qin Li, Jason T. L. Wang, Haimin Wang, Serena Criscuoli   +4 more
doaj   +1 more source