Results 41 to 50 of about 709,447 (218)

Multi-process driven unusually large equatorial perturbation electric fields during the April 2023 geomagnetic storm

Frontiers in Astronomy and Space Sciences
The low latitude ionosphere and thermosphere are strongly disturbed during and shortly after geomagnetic storms. We use novel Jicamarca radar measurements, ACE satellite solar wind, and SuperMAG geomagnetic field observations to study the electrodynamic ...
B. Fejer, S. R. Laranja, P. Condor
semanticscholar   +1 more source

Long-Term Evolution of Highly-Elliptical Orbits: Luni-Solar Perturbation Effects for Stability and Re-entry

Frontiers in Astronomy and Space Sciences, 2019
This paper investigates the long-term evolution of spacecraft in Highly Elliptical Orbits (HEOs). The single averaged disturbing potential due to luni-solar perturbations, zonal harmonics of the Earth gravity field is written in mean Keplerian elements ...
C. Colombo
semanticscholar   +1 more source

On the nature of an ejection event in the jet of 3C111

, 2008
We present a possible scenario for the ejection of a superluminal component in the jet of the Broad Line Radio Galaxy 3C111 in early 1996. VLBI observations at 15 GHz discovered the presence of two jet features on scales smaller than one parsec.
Agudo, Aloy, E. Ros, Fender, Grandi, Gómez, I. Agudo, J. L. Gómez, Kadler, Kellermann, Lister, M. Kadler, M. Perucho, Marscher, Marscher, Marscher, Martí, Mirabel, Perucho, Savolainen, Y. Y. Kovalev   +20 more
core   +1 more source

Interpretation of Strong Short-Term Central Perturbations in the Light Curves of Moderate-Magnification Microlensing Events [PDF]

, 2009
To improve the planet detection efficiency, current planetary microlensing experiments are focused on high-magnification events searching for planetary signals near the peak of lensing light curves.
A. Allan, A. Cassan, A. Fukui, A. Gould, A. Korpela, A. Udalski, A. Williams, Albrow, and M. Zub, B. S. Gaudi, B.-G. Park, C. H. Ling, C. Han, C. S. Botzler, C. Snodgrass, C.-U. Lee, Chung, D. D. Prester, D. Kim, D. Kubas, D. L. DePoy, D. M. Bramich, D. P. Bennett, D. S. Sullivan, Dominik, Dong, Dong, E. Corrales, F. Abe, G. Pietrzyński, G. W. Christie, Ghosh, Gould, Gould, Gould, H. Calitz, Han, Han, Han, I. A. Bond, I. Soszyński, I. Steele, J. A. R. Caldwell, J. B. Hearnshaw, J. B. Marquette, J. Donatowicz, J. Greenhill, J. McCormick, J. Menzies, J. P. Beaulieu, J. Wambsganss, K. C. Sahu, K. Furusawa, K. Hill, K. Horne, K. Kamiya, K. Masuda, K. Ohnishi, K. R. Pollard, K. Ulaczyk, K.-H. Hwang, L. A. B. Monard, L. Skuljan, M. Bode, M. Burgdorf, M. D. Albrow, M. Dominik, M. Hoffman, M. K. Szymański, M. Kubiak, M. Nagaya, N. Kains, N. Miyake, N. Rattenbury, O. Szewczyk, P. C. M. Yock, P. Fouque, P. J. Tristram, P. M. Kilmartin, P. Meintjes, Park, Pejcha, R. Martin, R. Street, R. W. Pogge, S. Brillant, S. Dieters, S. Dong, T. Natusch, T. Sako, T. Sumi, T. Tokumura, To. Saito, U. G. Jørgensen, Udalski, V. Batista, W. Allen, W. L. Sweatman, W. Lin, Y. C. Perrott, Y. Itow, Y. Matsubara, Y. Muraki, Y. Tsapras, Yoo, Ł. Wyrzykowski   +105 more
core   +3 more sources

Eigenvalues of the Operator Describing Magnetohydrodynamic Problems in Outer Parts of Galaxies

Mathematics
The magnetic field generation studies in astronomy lead to a number of interesting problems in mathematical physics. In the dynamo theory, the problem is reduced to a system of parabolic equations for the field components.
Evgeny Mikhailov, Tatiana Khasaeva
doaj   +1 more source

Scale transformations, tree-level perturbation theory and the cosmological matter bispectrum [PDF]

, 2007
Scale transformations have played an extremely successful role in studies of cosmological large-scale structure by relating the non-linear spectrum of cosmological density fluctuations to the linear primordial power at longer wavelengths.
Jun Pan, P. Coles, Istvan Szapudi Purple Mountain Observatory, Nanjing, China School of PhysicsAstronomy, U. Nottingham, UK School of PhysicsAstronomy, C. University, UK Institute for Astronomy, U. Hawaii, Usa   +10 more
semanticscholar   +1 more source

Helioseismology and Asteroseismology: Looking for Gravitational Waves in acoustic oscillations

, 2014
Current helioseismology observations allow the determination of the frequencies and surface velocity amplitudes of solar acoustic modes with exceptionally high precision. In some cases, the frequency accuracy is better than one part in a million. We show
Lopes, Ilídio, Silk, Joseph
core   +2 more sources

Determining the Physical Lens Parameters of the Binary Gravitational Microlensing Event MOA-2009-BLG-016 [PDF]

, 2010
We report the result of the analysis of the light curve of the microlensing event MOA-2009-BLG-016. The light curve is characterized by a short-duration anomaly near the peak and an overall asymmetry.
A. Fukui, A. Gould, A. Korpela, Afonso, Albrow, Albrow, An, B. S. Gaudi, Bennett, Bennett, Bennett, C. H. Ling, C. Han, C. S. Botzler, C.-U. Lee, D. J. Sullivan, D. L. Depoy, D. P. Bennett, D. Suzuki, Dominik, Dong, Dong, F. Abe, F. Hayashi, Ghosh, Gould, Gould, I. A. Bond, J. B. Hearnshaw, Jiang, K. Furusawa, K. Kamiya, K. Masuda, K. Nishimoto, K. Ohnishi, K. Wada, K.-H. Hwang, L. Skuljan, N. Miyake, N. Rattenbury, P. C. M. Yock, P. J. Tristram, P. M. Kilmartin, R. W. Pogge, S. Hosaka, S. Makita, Smith, T. Sako, T. Sumi, To. Saito, Udalski, W. L. Sweatman, W. Lin, Y. C. Perrott, Y. Itow, Y. Matsubara, Y. Muraki, Yee   +57 more
core   +2 more sources

Unique Performance Considerations for Printable Organic Semiconductor and Perovskite Radiation Detectors: Toward Consensus on Best Practice Evaluation

Advanced Functional Materials, EarlyView.
A lack of standard approaches for testing and reporting the performance of metal halide perovskites and organic semiconductor radiation detectors has resulted in inconsistent interpretation of performance parameters, impeding progress in the field. This Perspective recommends key metrics and experimental details, which are suggested for reporting in ...
Jessie A. Posar, Matthew Large, Andrea Ciavatti, Laura Basiricò, Beatrice Fraboni, Paul J. Sellin, Attila J. Mozer, Marco Petasecca, Matthew J. Griffith   +8 more
wiley   +1 more source

An Asymptotically Safe Guide to Quantum Gravity and Matter [PDF]

Frontiers in Astronomy and Space Sciences, 2018
Asymptotic safety generalizes asymptotic freedom and could contribute to understanding physics beyond the Standard Model. It is a candidate scenario to provide an ultraviolet extension for the effective quantum field theory of gravity through an ...
A. Eichhorn
semanticscholar   +1 more source