62 research outputs found
The GAMMA-400 gamma-ray telescope for precision gamma-ray emission investigations
The GAMMA-400 gamma-ray telescope with excellent angular and energy resolutions is designed to search for signatures of dark matter in the fluxes of gamma-ray emission and electrons + positrons. Precision investigations of gamma-ray emission from Galactic Center, Crab, Vela, Cygnus, Geminga, and other regions will be performed, as well as diffuse gamma-ray emission, along with measurements of high-energy electron + positron and nuclei fluxes. Furthermore, it will study gamma-ray bursts and gamma-ray emission from the Sun during periods of solar activity. The GAMMA-400 energy range is expected to be from â\u88¼20 MeV up to TeV energies for gamma rays, up to 10 TeV for electrons + positrons, and up to 1015eV for cosmic-ray nuclei. For 100-GeV gamma rays, the GAMMA-400 angular resolution is â\u88¼0.01° and energy resolution is â\u88¼1%; the proton rejection factor is â\u88¼5x105. GAMMA-400 will be installed onboard the Russian space observatory
GAMMA-400 gamma-ray observatory
The GAMMA-400 gamma-ray telescope with excellent angular and energy
resolutions is designed to search for signatures of dark matter in the fluxes
of gamma-ray emission and electrons + positrons. Precision investigations of
gamma-ray emission from Galactic Center, Crab, Vela, Cygnus, Geminga, and other
regions will be performed, as well as diffuse gamma-ray emission, along with
measurements of high-energy electron + positron and nuclei fluxes. Furthermore,
it will study gamma-ray bursts and gamma-ray emission from the Sun during
periods of solar activity. The energy range of GAMMA-400 is expected to be from
~20 MeV up to TeV energies for gamma rays, up to 20 TeV for electrons +
positrons, and up to 10E15 eV for cosmic-ray nuclei. For high-energy gamma rays
with energy from 10 to 100 GeV, the GAMMA-400 angular resolution improves from
0.1{\deg} to ~0.01{\deg} and energy resolution from 3% to ~1%; the proton
rejection factor is ~5x10E5. GAMMA-400 will be installed onboard the Russian
space observatory.Comment: 8 pages, 2 figures, 2 tables, submitted to the proceedings of
ICRC201
CLOUD: an atmospheric research facility at CERN
This report is the second of two addenda to the CLOUD proposal at CERN (physics/0104048), which aims to test experimentally the existence a link between cosmic rays and cloud formation, and to understand the microphysical mechanism. The document places CLOUD in the framework of a CERN facility for atmospheric research, and provides further details on the particle beam requirements
Addendum to the CLOUD proposal
This report is the first of two addenda to the CLOUD proposal at CERN (physics/0104048), which aims to test experimentally the existence a link between cosmic rays and cloud formation, and to understand the microphysical mechanism. The document provides further details on the detector design, scientific motivation and experimental programme
Molecular understanding of sulphuric acid-amine particle nucleation in the atmosphere
4 pages 359-363 in the print version, additional 7 pages online.Peer reviewe
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Energetic particle influence on the Earth's atmosphere
This manuscript gives an up-to-date and comprehensive overview of the effects of energetic particle precipitation (EPP) onto the whole atmosphere, from the lower thermosphere/mesosphere through the stratosphere and troposphere, to the surface. The paper summarizes the different sources and energies of particles, principally
galactic cosmic rays (GCRs), solar energetic particles (SEPs) and energetic electron precipitation (EEP). All the proposed mechanisms by which EPP can affect the atmosphere
are discussed, including chemical changes in the upper atmosphere and lower thermosphere, chemistry-dynamics feedbacks, the global electric circuit and cloud formation. The role of energetic particles in Earth’s atmosphere is a multi-disciplinary problem that requires expertise from a range of scientific backgrounds. To assist with this synergy, summary tables are provided, which are intended to evaluate the level of current knowledge of the effects of energetic particles on processes in the entire atmosphere
Features of cosmic ray variation at the phase of the minimum between the 23rd and 24th solar cycles
Effect of variations in the Earth’s electrical field caused by weather conditions on neutron monitoring
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