Results 91 to 100 of about 257,498 (300)

Scaling properties of the cosmic background plasma and radiation [PDF]

Int.J.Mod.Phys. D12 (2003) 509-517, 2003
Scaling properties of the cosmic microwave background (CMB) radiation are studied using satellite (COBE-DMR maps), balloon-borne and ground-based (combined QMASK map) data. Quantitative consistency is found between the multiscaling properties of the COBE-DMR and QMASK CMB maps.
arxiv   +1 more source

A Cosmic Microwave Background Radiation Polarimeter Using Superconducting Bearings

, 2003
Measurements of the polarization of the cosmic microwave background (CMB) radiation are expected to significantly increase our understanding of the early universe.
Hanany, S., Hull, J. R., Johnson, B., Jones, T., Ma, K. B., Matsumura, T.   +5 more
core   +2 more sources

Modeling Background Radiation in Isotropic Cosmologies [PDF]

Gen.Rel.Grav.43:1625-1638,2011, 2011
Using explicit perturbations of isotropic cosmological models which describe simple gravitational waves, an isotropic tensor having the algebraic symmetries of the Bel-Robinson tensor is derived as a model of cosmic background gravitational radiation and this is used to provide an answer to the question: in what sense can an energy-momentum-stress ...
arxiv   +1 more source

JWST Constraints on the UV Luminosity Density at Cosmic Dawn: Implications for 21 cm Cosmology

The Astrophysical Journal Letters, 2023
An unprecedented array of new observational capabilities are starting to yield key constraints on models of the epoch of first light in the Universe. In this Letter we discuss the implications of the UV radiation background at cosmic dawn inferred by ...
Sultan Hassan, Christopher C. Lovell, Piero Madau, Marc Huertas-Company, Rachel S. Somerville, Blakesley Burkhart, Keri L. Dixon, Robert Feldmann, Tjitske K. Starkenburg, John F. Wu, Christian Kragh Jespersen, Joseph D. Gelfand, Ankita Bera   +12 more
doaj   +1 more source

The Thermal Structure and Composition of Jupiter's Great Red Spot From JWST/MIRI

Journal of Geophysical Research: Planets, Volume 129, Issue 10, October 2024.
Abstract Jupiter's Great Red Spot (GRS) was mapped by the James Webb Space Telescope (JWST)/Mid‐Infrared Instrument (4.9–27.9 μ ${\upmu }$m) in July and August 2022. These observations took place alongside a suite of visual and infrared observations from; Hubble, JWST/NIRCam, Very Large Telescope/VISIR and amateur observers which provided both spatial ...
Jake Harkett, Leigh N. Fletcher, Oliver R. T. King, Michael T. Roman, Henrik Melin, Heidi B. Hammel, Ricardo Hueso, Agustín Sánchez‐Lavega, Michael H. Wong, Stefanie N. Milam, Glenn S. Orton, Katherine de Kleer, Patrick G. J. Irwin, Imke de Pater, Thierry Fouchet, Pablo Rodríguez‐Ovalle, Patrick M. Fry, Mark R. Showalter   +17 more
wiley   +1 more source

Angular Spectra for non-Gaussian Isotropic Fields [PDF]

, 2013
Cosmic Microwave Background (CMB) Anisotropies is a subject of intensive research in several fields of sciences. In this paper we start a systematic development of basic notions and theory in statistics according to the application for CMB.
Terdik, Gyorgy
core  

Analysis of cosmic microwave background radiation in the presence of Lorentz violation [PDF]

arXiv, 2007
We examine the effects Lorentz violation on observations of cosmic microwave background radiation. In particular, we focus on changes in polarization caused by vacuum birefringence. We place stringent constraints on previously untested violations.
arxiv  

Evidence of a New Population of Weak Terrestrial Gamma‐Ray Flashes Observed From Aircraft Altitude

Geophysical Research Letters, Volume 51, Issue 17, 16 September 2024.
Abstract Terrestrial Gamma‐ray Flashes (TGFs) are ten‐to‐hundreds of microsecond bursts of gamma‐rays produced when electrons in strong electric fields in thunderclouds are accelerated to relativistic energies. Space instruments have observed TGFs with source photon brightness down to ∼1017–1016. Based on space and aircraft observations, TGFs have been
I. Bjørge‐Engeland, N. Østgaard, D. Sarria, M. Marisaldi, A. Mezentsev, A. Fuglestad, N. Lehtinen, J. E. Grove, D. Shy, T. Lang, M. Quick, H. Christian, C. Schultz, R. Blakeslee, I. Adams, R. Kroodsma, G. Heymsfield, K. Ullaland, S. Yang, B. Hasan Qureshi, J. Søndergaard, B. Husa, D. Walker, M. Bateman, D. Mach, P. Bitzer, M. Fullekrug, M. Cohen, M. Stanley, S. Cummer, J. Montanya, M. Pazos, C. Velosa, O. van der Velde, Y. Pu, P. Krehbiel, J. A. Roncancio, J. A. Lopez, M. Urbani, A. Santos, T. Neubert, F. Gordillo‐Vazquez   +41 more
wiley   +1 more source

Level Crossing Analysis of Cosmic Microwave Background Radiation: A method for detecting cosmic strings [PDF]

, 2010
In this paper we study the footprint of cosmic string as the topological defects in the very early universe on the cosmic microwave background radiation.
M. Movahed, S. Khosravi
semanticscholar   +1 more source

A common origin of all the species of high-energy cosmic rays? [PDF]

, 1999
Cosmic ray nuclei, cosmic ray electrons with energy above a few GeV, and the diffuse gamma-ray background radiation (GBR) above a few MeV, presumed to be extragalactic, could all have their origin or residence in our galaxy and its halo.
Antoniou, Nikos, Dar, Arnon, De Rújula, A.   +2 more
core   +1 more source