Results 31 to 40 of about 101,525 (149)

Unidirectional gradient of galactic cosmic ray intensity at different cut-off rigidities and solar magnetic polarities

open access: yesJournal of Physics: Conference Series, 2023
Energetic charged particles known as Galactic cosmic rays (GCRs) are mostly protons originating from supernova remnants. The solar wind modulates the GCR intensity near-Earth along the solar cycles (SCs) in association with the heliospheric magnetic ...
C. Wuttiya, T. Yeeram
semanticscholar   +1 more source

Supernova Cosmology: Legacy and Future [PDF]

open access: yes, 2011
The discovery of dark energy by the first generation of high-redshift supernova surveys has generated enormous interest beyond cosmology and has dramatic implications for fundamental physics.
A. Goobar, B. Leibundgut
semanticscholar   +1 more source

Inhomogeneity in the Supernova Remnant Distribution as the Origin of the PAMELA Anomaly [PDF]

open access: yes, 2009
Recent measurements of the positron/electron ratio in the cosmic ray (CR) flux exhibits an apparent anomaly, whereby this ratio increases between 10 and 100 GeV.
N. Shaviv, E. Nakar, T. Piran
semanticscholar   +1 more source

Modeling of the Vela complex including the Vela supernova remnant, the binary system γ2 Velorum, and the Gum nebula [PDF]

open access: yes, 2010
We study the geometry and dynamics of the Vela complex including the Vela supernova remnant (SNR), the binary system γ 2 Velorum and the Gum nebula. We show that the Vela SNR belongs to a subclass of non-Sedov adiabatic remnants in a cloudy interstellar ...
I. Sushch, B. Hnatyk, A. Neronov
semanticscholar   +1 more source

Determination of acceleration mechanism characteristics directly and nonparametrically from observations: Application to supernova remnants [PDF]

open access: yes, 2013
We have developed an inversion method for determination of the characteristics of the acceleration mechanism directly and non-parametrically from observations, in contrast to the usual forward fitting of parametric model variables to observations. In two
V. Petrosian, Qingrong Chen
semanticscholar   +1 more source

The contribution of supernova remnants to the galactic cosmic ray spectrum

open access: yes, 2010
The supernova paradigm for the origin of galactic cosmic rays has been deeply affected by the development of the non-linear theory of particle acceleration at shock waves. Here we discuss the implications of applying such theory to the calculation of the
Amato   +34 more
core   +1 more source

THE CHANGING EVENT SURVEY: TRANSIENTS, SPACE DEBRIS & NEOs

open access: yesRevista Mexicana de Astronomía y Astrofísica Serie de Conferencias, 2021
Motivated by the promising era of time-domain and multi-messenger astronomy, CHanging Event Survey (CHES) is designed to join the ongoing campaign with a powerful wide-field optical telescope array.
T. Sun, C. Zhang, Y. Ping, X. Wu
semanticscholar   +1 more source

Density profiles of supernova matter and determination of neutrino parameters

open access: yes, 2007
The flavor conversion of supernova neutrinos can lead to observable signatures related to the unknown neutrino parameters. As one of the determinants in dictating the efficiency of resonant flavor conversion, the local density profile near the MSW ...
S. P. Mikheyev   +2 more
core   +1 more source

Tycho Brahe's 1572 supernova as a standard type Ia explosion revealed from its light echo spectrum [PDF]

open access: yes, 2008
Type Ia supernovae (SNe Ia) are thermonuclear explosions of white dwarf stars in close binary systems. They play an important role as cosmological distance indicators and have led to the discovery of the accelerated expansion of the Universe.
A Decourchelle   +35 more
core   +1 more source

Deep-Ocean Crusts as Telescopes: Using Live Radioisotopes to Probe Supernova Nucleosynthesis [PDF]

open access: yes, 2004
Live 60Fe has recently been detected in a deep-ocean ferromanganese crust, isolated in layers dating from about 3 Myr ago. Since 60Fe has a mean life of 2.2 Myr, a near-Earth supernova is the only likely source for such a signal, and we explore here the ...
B. Fields, K. Hochmuth, J. Ellis
semanticscholar   +1 more source

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