نتایج جستجو برای: solar cosmic ray particle
تعداد نتایج: 600674 فیلتر نتایج به سال:
Palaeoclimatic data provide extensive evidence for solar forcing of the climate during the Holocene and the last ice age, but the underlying mechanism remains a mystery. However recent satellite observations suggest that clouds may be influenced by cosmic rays, which are modulated by the solar wind. Physical mechanisms have been proposed to explain the cloud observations, but definitive experim...
When averaged over large solid angles, the cosmic ray intensity measured by the Fly's Eye reveals no statistically significant anisotropy. The sky is divided into 6 quadrilateral regions of equal solid angle which are centered on the directions of the galactic coordinate system's axes. For each of nine energy bands, we compare the number of detected cosmic rays in each region with the number ex...
[1] We have developed a real-time system to monitor high-energy cosmic rays for use in space weather forecasting and specification. Neutron monitors and muon detectors are used for our system, making it possible to observe cosmic rays with dual energy range observations. In large solar energetic particle (SEP) events, the ground level enhancement (GLE) can provide the earliest alert for the ons...
Part of results of collaborative studies for revealing an influence of the periodical changes of solar, geomagnetic and cosmic ray activities on the sudden cardiac death (SCD) mortality is described in this paper. The data covering daily and monthly temporal distribution of SCD (788 patients in 36 months in 2003-2005), taken from all of emergency and first medical aid stations of grand Baku are...
Since the early 1970’s, anomalous cosmic ray (ACR) intensities at 1 AU at solar minimum have generally tracked the galactic cosmic ray (GCR) intensities as measured by neutron monitors. Throughout the current A 0 cycle, however, the ACR intensities are a factor of 3–4 lower than expected from scaling neutron monitor rates; a similar discrepancy seems to have been present during the last A 0 per...
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Positrons are known to be produced in interactions between cosmic-ray nuclei and interstellar matter (“secondary production”). Positrons may, however, also be created by dark matter particle annihilations in the galactic halo or in the magnetospheres of near-by pulsars. The nature of dark matter is one of the most prominent open questions in science today. An observation of positrons from pulsa...
Statistically significant variations have been observed in the differential flux of ~27-MeV anomalous cosmic ray (ACR) oxygen, helium, and protons at the Voyager 1 spacecraft during 1998 and 1999 (at a helioradius of ~73 AU). The quasiperiodic variations are in phase, with oxygen and helium having periods near 151 days, while protons exhibit a period of ~146 days. The Voyager 1 ACRs vary by ~30...
The ability to evaluate the cosmic ray environment at Mars is of interest for future manned exploration. To support exploration, tools must be developed to accurately access the radiation environment in both free space and on planetary surfaces. The primary tool NASA uses to quantify radiation exposure behind shielding materials is the space radiation transport code, HZETRN. In order to build c...
The observed correlation between global low cloud amount and the flux of high energy cosmic-rays supports the idea that ionization plays a crucial role in tropospheric cloud formation. We explore this idea quantitatively with a simple model of cosmic-ray ionization enhancement of the formation of cloud condensation nuclei. This model predicts that solar modulation of the cosmic-ray ionization r...
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