Results 11 to 20 of about 740 (225)

Unveiling the unconventional optical signatures of regular black holes within accretion disk

European Physical Journal C: Particles and Fields, 2023
The optical characteristics of three types of black holes (BHs) surrounded by a thin accretion disk are discussed, namely the Schwarzschild BH, Bardeen BH, and Hayward BH. We calculate the deflection angle of light as it traverses the vicinity of each BH
Sen Guo, Yu-Xiang Huang, Yu-Hao Cui, Yan Han, Qing-Quan Jiang, En-Wei Liang, Kai Lin   +6 more
doaj   +1 more source

Directionally Effect Observation in Topographical Site-Effects at Feden-Sema Range (Guelma-Northern Algeria) from Ambient Vibration [PDF]

MATEC Web of Conferences
The Eocene Feden-Sema Range is a topographical structure located in the complex area of Mechtat El-Ababsia (Guelma) characterized by topographical site effects from an experimental investigation using earthquake and ambient vibration.
Layadi Khalissa, Tebbouche Yacine Mohamed, Chimouni Redouane, Saadi Ahmed, Beldjoudi Hamoud   +4 more
doaj   +1 more source

Investigating Effects of Solar Proton Events and Forbush Decreases on Ground‐Level Potential Gradient Recorded at Middle and Low Latitudes and Different Altitudes

Space Weather, 2022
High‐energetic charged particles, such as solar protons, and phenomena such as Forbush decreases are eligible candidates to affect the global electric circuit.
J. Tacza, A. Odzimek, E. Tueros Cuadros, J.‐P. Raulin, M. Kubicki, G. Fernandez, A. Marun   +6 more
doaj   +1 more source

Measuring Global Signals in the Potential Gradient at High Latitude Sites

Frontiers in Earth Science, 2021
Previous research has shown that the study of the global electrical circuit can be relevant to climate change studies, and this can be done through measurements of the potential gradient near the surface in fair weather conditions.
José Tacza, José Tacza, Keri A. Nicoll, Keri A. Nicoll, Edith L. Macotela, Edith L. Macotela, Marek Kubicki, Anna Odzimek, Jyrki Manninen   +8 more
doaj   +1 more source

Fast CCD Photometry in the Taiwan-America Occultation Survey

Open Astronomy, 2003
We describe the efforts of the Taiwan-America Occultation Survey (TAOS) project to develop a data acquisition and analysis scheme for fast CCD imaging photometry.
Chen W. P., Zhang Z. W., King S. K., Alcock C., Byun Y. I., Cook K. H., Dave R., Giammarco J., Lee T., Lehner M., Liang C., Lissauer J., Marshall S., Pater I. de, Porrata R., Rice J., Wang A., Wang S. Y., Wen C. Y.   +18 more
doaj   +1 more source

Poynting Fluxes, Field‐Aligned Current Densities, and the Efficiency of the Io‐Jupiter Electrodynamic Interaction

Geophysical Research Letters, 2023
Juno's highly inclined orbits provide opportunities to sample high‐latitude magnetic field lines connected to the orbit of Io, among the other Galilean satellites.
A. H. Sulaiman, J. R. Szalay, G. Clark, F. Allegrini, F. Bagenal, M. J. Brennan, J. E. P. Connerney, V. Hue, W. S. Kurth, R. L. Lysak, J. D. Nichols, J. Saur, S. J. Bolton   +12 more
doaj   +1 more source

Reassessing the organic carbon budget in the Murchison meteorite through an extraction–recovery mass‐balance approach

Meteoritics &Planetary Science, EarlyView.
Abstract A substantial fraction of organic carbon in carbonaceous chondrites has long been described as “missing,” reflecting incomplete recovery and limited resolution of operationally defined organic components. Here, we present a quantitative reassessment of the carbon budget in the Murchison meteorite using an integrated extraction–recovery mass ...
Hina Dohi, Minako Hashiguchi, Koichi Mimura   +2 more
wiley   +1 more source

Visible, near‐, and thermal infrared spectra of asteroid Bennu samples: Relationship to and implications for remote sensing of carbonaceous asteroids

Meteoritics &Planetary Science, EarlyView.
Abstract Remote spectroscopy is used to characterize the mineralogy and infer the history of planetary bodies. Carbonaceous asteroids, such as B‐type (101955) Bennu, represent the earliest stages of planet formation. B types have a blue (negative) spectral slope and comprise <5% of asteroids.
V. E. Hamilton, E. A. Cloutis, R. E. Milliken, P. Haenecour, D. R. Golish, K. J. Domanik, T. J. McCoy, L. P. Keller, A. A. Simon, H. H. Kaplan, C. A. Goodrich, S. A. Sandford, D. Applin, T. Hiroi, D. H. Hill, N. G. Lunning, F. M. McCubbin, S. A. Eckley, C. J. Snead, E. H. Blumenfeld, J. E. Aebersold, C. Schultz, N. Bowles, K. A. Shirley, S. S. Russell, J. J. Barnes, T. J. Zega, D. N. DellaGiustina, A. J. Ryan, D. P. Glavin, J. P. Dworkin, H. C. Connolly Jr., D. S. Lauretta   +32 more
wiley   +1 more source

Knobs and dials of retrieving JWST transmission spectra

Astronomy & Astrophysics
Context. Since the launch of the James Webb Space Telescope (JWST), observations of exoplanetary atmospheres have experienced a revolution in data quality.
Schleich S., Boro Saikia S., Changeat Q., Güdel M., Voigt A., Waldmann I.   +5 more
doaj   +1 more source

Unraveling the Thermodynamic Enigma between Fast and Slow Coronal Mass Ejections

The Astrophysical Journal, 2023
Coronal mass ejections (CMEs) are the most energetic expulsions of magnetized plasma from the Sun that play a crucial role in space weather dynamics.
Soumyaranjan Khuntia, Wageesh Mishra, Sudheer K. Mishra, Yuming Wang, Jie Zhang, Shaoyu Lyu   +5 more
doaj   +1 more source