Three-dimensional earthward fast flow in the near-Earth plasma sheet in a sheared field: comparisons between simulations and observations [PDF]
Annales Geophysicae, 2009 Three-dimensional configuration of earthward fast flow in the near-Earth plasma sheet is studied using three-dimensional magnetohydrodynamics (MHD) simulations on the basis of the spontaneous fast reconnection model.
K. Kondoh, M. Ugai
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Late-time cosmic evolution of dust: solving the puzzle [PDF]
, 2021 Dust is an essential ingredient of galaxies, determining the physical and chemical conditions in the interstellar medium. Several complementary observational evidences indicate that the cosmic dust mass density significantly drops from redshift z = 1 to ...
A. Ferrara, C. Péroux
semanticscholar +1 more source
The structure and dynamics of a large-scale plasmoid generated by fast reconnection in the geomagnetic tail [PDF]
Annales Geophysicae, 2011 As a sequence of Ugai (2010b), the present paper studies in detail the structure and dynamics of large-scale (principal) plasmoid, generated by the fast reconnection evolution in a sheared current sheet with no initial northward field component. The
M. Ugai
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Conditions for substorm onset by the fast reconnection mechanism [PDF]
Annales Geophysicae, 2008 The fast reconnection mechanism, involving slow shocks and Alfvénic fast plasma jets, is most responsible for the explosive conversion of magnetic energy associated with geomagnetic substorms and solar flares.
M. Ugai
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Magnetic field structure of large-scale plasmoid generated by the fast reconnection mechanism in a sheared current sheet [PDF]
Annales Geophysicae, 2010 On the basis of the spontaneous fast reconnection model, three-dimensional magnetic field profiles associated with a large-scale plasmoid propagating along the antiparallel magnetic fields are studied in the general sheared current sheet system.
M. Ugai
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Evolution of the cosmic web [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 The cosmic web is the largest scale manifestation of the anisotropic gravitational collapse of matter. It represents the transitional stage between linear and non-linear structures and contains easily accessible information about the early phases of structure formation processes.
Cautun, Marius +3 more
openaire +5 more sources
Virtual satellite observations of plasmoids generated by fast reconnection in the geomagnetic tail [PDF]
Annales Geophysicae, 2011 The present paper studies fundamental features of plasmoid propagation by virtual satellite observations in the simulation box. The plasmoid domain is divided into the plasmoid reconnection region P, where magnetized plasmas with reconnected field ...
M. Ugai
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The Cosmic Evolution of Quasars [PDF]
Highlights of Astronomy, 2005 AbstractThe form of the quasar luminosity function and its redshift dependence to z~1 has long been established; powerful evolution is required so that by z=1 there is an increase of order 102 – 103 in the space density of the most luminous sources. However it is more difficult to deduce the form of the LF at high redshifts.
Jackson, C +4 more
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STELLAR AND TOTAL BARYON MASS FRACTIONS IN GROUPS AND CLUSTERS SINCE REDSHIFT 1 [PDF]
, 2009 We investigate if the discrepancy between estimates of the total baryon mass fraction obtained from observations of the cosmic microwave background (CMB) and of galaxy groups/clusters persists when a large sample of groups is considered. To this purpose,
S.Giodini +47 more
semanticscholar +1 more source
Discovery of an excess of Hα emitters around 4C 23.56 at z = 2.48 [PDF]
, 2010 We report on the discovery of a significant excess of candidate H˛ emitters (HAEs) in the field of the radio galaxy 4C 23.56 at z = 2.483. Using the MOIRCS near-infrared imager on the Subaru Telescope we found 11 candidate emission-line galaxies to a ...
I. Tanaka +29 more
semanticscholar +1 more source