Results 51 to 60 of about 54,240 (242)

Time-variability in the Interstellar Boundary Conditions of the Heliosphere: Effect of the Solar Journey on the Galactic Cosmic Ray Flux at Earth

, 2011
During the solar journey through galactic space, variations in the physical properties of the surrounding interstellar medium (ISM) modify the heliosphere and modulate the flux of galactic cosmic rays (GCR) at the surface of the Earth, with consequences ...
A. Yeghikyan, B. Wolff, B.E. Wood, C. Heiles, C.P. Sonett, D.M. Meyer, E. Möbius, G. Hebrard, G.P. Zank, H. Müller, H. Müller, H.-R. Müller, Hans-Reinhard Mueller, I.G. Usoskin, J. Goldston Peek, J. Kirkby, J.D. Slavin, J.T. Gosling, K.G. McCracken, K.G. McCracken, L.A. Fisk, M. Salvati, M. Wolleben, M.A.C. Perryman, N.V. Pogorelov, P.C. Frisch, P.C. Frisch, P.C. Frisch, P.C. Frisch, P.C. Frisch, P.C. Frisch, P.C. Frisch, Priscilla C. Frisch, R. Lallement, R. Muscheler, R. Schönrich, R.A. Leske, R.A. Leske, R.A. Mewaldt, R.C. Bohlin, S. Redfield, S. Redfield, S. Redfield, S. Stanimirović, T.E. Holzer, U. Haud, V. Florinski, V. Florinski, W.R. Webber   +48 more
core   +1 more source

Boron abundances in diffuse interstellar clouds [PDF]

Proceedings of the International Astronomical Union, 2009
AbstractWe present a comprehensive survey of B abundances in diffuse interstellar clouds from HST/STIS observations along 56 Galactic sight lines. Our sample is the result of a complete search of archival STIS data for the B II λ1362 resonance line, with each detection confirmed by the presence of absorption from other dominant ions at the same ...
Ritchey, A. M., Federman, S. R., Sheffer, Y., Lambert, D. L.   +3 more
openaire   +2 more sources

Interstellar Extinction in the Direction of The Barnard 1 Dark Cloud in Perseus

Open Astronomy, 2003
Spectral and luminosity classes, absolute magnitudes, color excesses, interstellar extinctions and distances are determined for 98 stars down to 18 mag in the Barnard 1 dark cloud belonging to the Per OB2 association. The classification of stars is based
Černis K., Straižys V.
doaj   +1 more source

Observations of Multiphase, High-velocity, Shocked Gas in the Vela Supernova Remnant

The Astrophysical Journal, 2023
We present an analysis of high-resolution far-UV archival spectra obtained with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope of the star HD 75309, which probes high-velocity shocked gas in the Vela supernova remnant (SNR).
Adam M. Ritchey
doaj   +1 more source

Small-Scale Interstellar Na I Structure Toward M92 [PDF]

, 2001
We have used integral field echelle spectroscopy with the DensePak fiber-optic array on the KPNO WIYN telescope to observe the central 27" x 43" of the globular cluster M92 in the Na I D wavelength region at a spatial resolution of 4".
David M. Meyer, J. T. Lauroesch, Lilienthal D., Mar D. P., Pilachowski C., Roth K. C., Sean M. Andrews   +6 more
core   +3 more sources

Modeling sulfur depletion in interstellar clouds [PDF]

Astronomy & Astrophysics, 2019
Context. The elemental depletion of interstellar sulfur from the gas phase has been a recurring challenge for astrochemical models. Observations show that sulfur remains relatively non-depleted with respect to its cosmic value throughout the diffuse and translucent stages of an interstellar molecular cloud, but its atomic and molecular gas-phase ...
Jacob C. Laas, Paola Caselli
openaire   +3 more sources

Exploring the Effects of Reduced Gravitational Field Impacts on Convective Heat Transfer: A Comprehensive Review

Heat Transfer, Volume 55, Issue 1, Page 764-774, January 2026.
ABSTRACT This review explores the impact of gravitational instability on convective heat transfer, integrating existing research results and theoretical models. Gravitational instability is vital in promoting or hindering convective actions in different systems, such as atmospheric events, ocean currents, and industrial processes.
Hossam A. Nabwey, Muhammad Ashraf, A. M. Rashad, Ali J. Chamkha   +3 more
wiley   +1 more source

Entropy Export and Chemical Reactions in Plasmas

Plasma Processes and Polymers, Volume 23, Issue 1, January 2026.
In a non‐equilibrium plasma, energy is transferred to molecules by electron‐impact (1), collisions among excited molecules (2), and Joule heating (3). The entropy balance for this open system relates the energy available per molecule to changes in entropy, which determines plasma‐based gas conversion. ABSTRACT Is plasma truly a “fourth state of matter”?
Dirk Hegemann, Ramses Snoeckx
wiley   +1 more source

Interstellar H2 toward HD 37903

, 2011
We present an analysis of interstellar H2 toward HD 37903, which is a hot, B 1.5 V star located in the NGC 2023 reflection nebula. Meyer et al. (2001) have used a rich spectrum of vibrationally excited H2 observed by the HST to calculate a model of the ...
Abgrall, Abgrall, Black, Boissé, Diplas, Draine, Federman, Jensen, Le Bourlot, Le Petit, Lee, Meyer, P. Gnaciński, Rachford, Wilgenbus   +14 more
core   +1 more source

A Catalog of Background Stars Reddened by Dust in the Taurus Dark Clouds [PDF]

, 2008
Normal field stars located behind dense clouds are a valuable resource in interstellar astrophysics, as they provide continua in which to study phenomena such as gas-phase and solid-state absorption features, interstellar extinction and polarization ...
Cambresy L., D. C. B. Whittet, D. M. Watson, Hough J. H., J. A. Ives, Padgett D., S. S. Shenoy, Straizys V., Tamura M., Whittet D. C. B.   +9 more
core   +2 more sources