Results 101 to 110 of about 22,727 (221)

The importance of atmospheric monitoring at the Pierre Auger Observatory

EPJ Web of Conferences, 2017
The Pierre Auger Observatory is an ultra-high energy cosmic ray experiment employing a giant surface array of particle detectors together with telescopes to image fluorescence light from extensive air showers in the atmosphere.
Dawson Bruce R.
doaj   +1 more source

Ultra high energy cosmic rays: the theoretical challenge [PDF]

Physics Reports, 2000
The origin of the highest-energy cosmic rays remains a mystery. The lack of a high energy cutoff in the cosmic ray spectrum together with an apparently isotropic distribution of arrival directions have strongly constrained most models proposed for the generation of these particles. An overview of the present state of theoretical proposals is presented.
openaire   +2 more sources

The 22-Year Hale Cycle in Cosmic Ray Flux – Evidence for Direct Heliospheric Modulation

, 2014
The ability to predict times of greater galactic cosmic ray (GCR) fluxes is important for reducing the hazards caused by these particles to satellite communications, aviation, or astronauts.
Thomas, SR, Lockwood, M, Owens, MJ
core  

Observation of ultra-high energy cosmic rays with the Telescope Array experiment

EPJ Web of Conferences, 2018
The origin of ultra-high energy cosmic rays (UHECRs) has been a longstanding mystery. The Telescope Array (TA) is the largest experiment in the northern hemisphere observing UHECR in Utah, USA. It aims to reveal the origin of UHECR by studying the energy
Takeishi Ryuji
doaj   +1 more source

The Search for Very High Energy γ-rays from Misaligned AGN [PDF]

, 2013
The aim of this work is to study the potential for emission at very high energies (100 GeV) by misaligned active galactic nuclei (AGN) and the future prospects for observations of these objects with the next generation imaging atmospheric Cherenkov ...
CHEESEBROUGH, ALISTAIR
core  

Ultra-High-energy Cosmic Ray Production in Binary Neutron Star Mergers

The Astrophysical Journal Letters
Having previously argued that binary neutron star (BNS) mergers are the principle source of ultra-high-energy cosmic rays (UHECRs), we exploit here the highly constrained initial conditions to make quantitative predictions for the cutoff energy of ...
Glennys R. Farrar
doaj   +1 more source

Results from the Telescope Array and review of HiRes

EPJ Web of Conferences, 2013
A new measurement of the cosmic ray spectrum using the Telescope Array surface arrays is presented. Results on the composition of ultra-high energy cosmic rays from air-fluorescence measurements of shower maximum distributions are presented.
Sokolsky P.
doaj   +1 more source

The effects of atmosphere conditions on gamma-ray astronomy [PDF]

, 2005
The High Energetic Stereoscopic System (H.E.S.S.) experiment is an array of imaging atmospheric Cherenkov (IAC) telescopes of the next generation, with enlarged mirrors and advanced detector electronics compared to its predecessors.
Aye, Klaus-Michael
core  

A Detectable Ultra-high-energy Cosmic-Ray Outburst from GRB 221009A

The Astrophysical Journal
Gamma-ray bursts (GRBs) have been proposed as one of the promising sources of ultra-high-energy cosmic rays (UHECRs), but observational evidence is still lacking.
Hao-Ning He, B. Theodore Zhang, Yi-Zhong Fan   +2 more
doaj   +1 more source

Correlation between the UHECRs measured by the Pierre Auger Observatory and Telescope Array and neutrino candidate events from IceCube

EPJ Web of Conferences, 2016
We present the results of three searches for correlations between ultra-high energy cosmic ray events measured by Telescope Array and the Pierre Auger Observatory and high-energy neutrino candidate events from IceCube.
Christov A., Golup G., Montaruli T., Rameez M., Aublin J., Caccianiga L., Ghia P.L., Roulet E., Unger M., Sagawa H., Tinyakov P.   +10 more
doaj   +1 more source