نتایج جستجو برای: cosmic rays
تعداد نتایج: 69861 فیلتر نتایج به سال:
The recent observations of γ-rays above TeV by H.E.S.S. are of great interest [1, 2]. They will certainly help in answering the old question of the origin of the cosmic rays till the knee [3, 4, 5, 6, 7] and at the same time they could provide us a reliable guidance for what we should expect in neutrino telescopes, at least for certain sources. This is evident for the main candidate sources of ...
Galactic cosmic rays have been positively correlated to the Earth’s low cloud cover. It is now evident that cosmic ray ionization is linked to lowering nucleation barriers and promoting early charged particle growth into the Aitken range. There is a substantially high probability that some of the charged particles grow to the 100 nm range and beyond to become CCN. There is also evidence that el...
Highly relativistic jets from merger and accretion induced collapse of compact stellar objects, which may produce the cosmological gamma ray bursts (GRBs), are also very eficient and powerful cosmic ray accelerators. The expected luminosity, energy spectrum and chemical composition of cosmic rays from Galactic GRBs, most of which do not point in our direction, can explain the observed propertie...
Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers ...
The majority of galactic gamma rays are produced by interaction of cosmic rays with matter or radiation fields. This results in a diffuse radiation concentrated in the galactic plane where the flux of cosmic rays and the density of material (mostly atomic, molecular and ionized hydrogen) is high. The interactions producing gamma rays include the decay of π produced in spallation reactions and i...
SERs are higher than HERs. These errors stem from two sources: alpha particles and cosmic rays. Alpha particle SERs have been virtually eliminated in modern DRAM technology. No DRAM is entirely insensitive to cosmic rays, but IBM DRAMs have very low cosmic ray sensitivity because the IBM “inside-store” trench cell stores more charge. In addition, the inside-store trench stores the charge in a d...
We employ the Monte Carlo particle collision code DPMJET3.04 to determine the multiplicity spectra of various secondary particles (in addition to π 0 's) with γ's as the final decay state, that are produced in cosmic-ray (p's and α's) interactions with the interstellar medium. We derive an easy-to-use γ-ray production matrix for cosmic rays with energies up to about 10 PeV. This γ-ray productio...
The diffusive shock acceleration of cosmic rays by supernova remnants depends upon the generation of magnetic fluctuations by cosmic rays upstream of the shock. Strongly driven, non-resonant, nearly purely growing modes grow more rapidly than the resonant Alfvén waves usually considered. Non-linear simulation shows that the magnetic field can be amplified from its seed value by orders of magnit...
We analyse cosmic ray hits impacting the detector system of the Coronal Diagnostic Spectrometer aboard the Solar and Heliospheric Observatory spacecraft. These observations allow us to study the modulation of cosmic rays over a 4 year period (1996-2000) running from solar minimum to maximum, from a Sun-Earth L1 Lagrangian orbit. The modulation, at the 45-50% level is consistent with cosmic rays...
A theory of the origin of cosmic radiation is proposed according to which cosmic rays are originated and accelerated primarily in the interstellar space of the galaxy by collisions against moving magmetic 6elds. One of the features of the theory is that it yields naturally an inverse power law for the spectral distribution of the cosmic rays. The chief difhculty is that it fails to explain in a...
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