نتایج جستجو برای: solar cosmic ray particle
تعداد نتایج: 600674 فیلتر نتایج به سال:
[1] A coronal mass ejection (CME) associated with an X17 solar flare reached Earth on October 29, 2003, causing an 11% decrease in the intensity of high-energy Galactic cosmic rays recorded by muon detectors. The CME also produced a strong enhancement of the cosmic ray directional anisotropy. Based upon a simple inclined cylinder model, we use the anisotropy data to derive for the first time th...
In this article, cosmic ray acceleration is studied in a nonlinear test particle picture in the hydrodynamic approach. The model includes cosmic rays and two oppositely propagating Alfvén waves. It is a nonlinear model because the interactions between the cosmic rays, waves and background plasma depend on the waves themselves. The background is a simple fast shock. Besides the parameters charac...
Cosmic ray causes hazards to microelectronic circuits. Presence of charged particles in the atmosphere was first noticed by Coloumb in 1785. But cosmic ray was discovered by Victor Hess in 1912. However new era of particle physics was started with the invention of neutron monitor in 1948 by John A. Simpson. New information regarding the energy spectrum, anisotropy, latitudinal, longitudinal and...
Particles are accelerated in cosmic sites probably under conditions very different from those at terrestrial particle accelerator laboratories. Nevertheless, specific experiments which explore plasma conditions and stimulated particle acceleration carry significant potential to illuminate some aspects of the cosmic particle acceleration process. Here we summarize what we have learned about cosm...
The FLUKA Monte Carlo transport code is widely used for fundamental research, radioprotection and dosimetry, hybrid nuclear energy system and cosmic ray calculations. The validity of its physical models has been benchmarked against a variety of experimental data over a wide range of energies, ranging from accelerator data to cosmic ray showers in the earth atmosphere. The code is presently unde...
The abundances of neon and several other isotopic ratios in the galactic cosmic rays (GCRs) have been measured using data from the Cosmic Ray Isotope Spectrometer (CRIS) aboard the Advanced Composition Explorer (ACE). We have derived the Ne/Ne ratio at the cosmic-ray source using the measured Ne, F, and O abundances as “tracers” of secondary isotope production. Using this approach, the Ne/Ne ab...
Noble gas isotopic abundances of ten lodranites (EET84302, FRO90011, Gibson, LEW86220, LEW88280, Lodran, MAC88177, QUE93148, Y74357, Y791491) and four acapulcoites (Acapulco, ALH81187, ALH81261, ALH84190), as well as major, minor, and trace element compositions of six lodranites (EET84302, Gibson, LEW88280, Lodran, MAC88177, Y791491), are reported. Because existing empirical production rate mod...
[1] Ti and Al activities and heavy nuclei tracks produced by cosmic rays have been measured in 19 stone meteorites that fell during the period 1766 to 2001. The gamma activity measurements of cosmogenic isotopes were performed using a highly specific and selective large volume Ge-NaI (Tl) spectrometer. The Ti activity, corrected for the target element abundances and shielding effects, shows a d...
Simulations with a Monte Carlo tool kit have been performed to determine the radiation environment a specific device, called a biochip, would face if it were placed into a rover bound to explore Mars' surface. A biochip is a miniaturized device that can be used to detect organic molecules in situ. Its specific detection part is constituted of proteins whose behavior under cosmic radiation is co...
Cosmic rays are known to cause biological effects directly and through ionizing radiation produced by their secondaries. These effects have been detected in airline crews and other specific cases where members of the population are exposed to above average secondary fluxes. Recent work has found a correlation between solar particle events and congenital malformations. In this work we use the re...
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