scholarly journals Measurement of the Cosmic Ray Flux near the Second Knee with the Pierre Auger Observatory

2019 ◽  
Author(s):  
Alan Coleman ◽  
Keyword(s):  
Cosmic Ray ◽  
Pierre Auger Observatory ◽  
Cosmic Ray Flux

scholarly journals The Pierre Auger Observatory: latest results and future perspectives

2018 ◽  
Vol 182 ◽  
pp. 02023
Author(s):  
Mario Buscemi
Keyword(s):  
Cosmic Rays ◽  
Cosmic Ray ◽  
Pierre Auger Observatory ◽  
Quality Data ◽  
Mass Composition ◽  
Ultrahigh Energy ◽  
Huge Amount ◽  
High Quality Data ◽  
Shower Maximum ◽  
Cosmic Ray Flux

The Pierre Auger Observatory is the largest ultrahigh-energy cosmic ray observatory in the world. The huge amount of high quality data collected since 2004 up to now led to great improvements in our knowledge of the ultra-energetic cosmic rays. The suppression of the cosmic-ray flux at highest energies was clearly established, and the extra-galactic origin of these particles was confirmed. On the other hand, measurements of the depth of shower maximum indicate a puzzling trend in the mass composition of cosmic rays at energy around the ankle up to the highest energy. The just started upgrade of the Observatory, dubbed AugerPrime, will improve the identification of the mass of primaries allowing us to disentangle models of origin and propagation of cosmic rays.

scholarly journals The Askaryan Radio Array

2012 ◽  
Vol 8 (S288) ◽  
pp. 115-122
Author(s):  
Kara D. Hoffman
Keyword(s):  
Neutrino Flux ◽  
Austral Summer ◽  
Cosmic Ray ◽  
High Energy ◽  
Pierre Auger Observatory ◽  
Ultra High Energy ◽  
Performance Requirements ◽  
Transparent Media ◽  
Order Of Magnitude ◽  
Cosmic Ray Flux

AbstractUltra high energy cosmogenic neutrinos could be most efficiently detected in dense, radio frequency (RF) transparent media via the Askaryan effect. Building on the expertise gained by RICE, ANITA and IceCube's radio extension in the use of the Askaryan effect in cold Antarctic ice, we are currently developing an antenna array known as ARA (The Askaryan Radio Array) to be installed in boreholes extending 200 m below the surface of the ice near the geographic South Pole. The unprecedented scale of ARA, which will cover a fiducial area of ≈ 100 square kilometers, was chosen to ensure the detection of the flux of neutrinos suggested by the observation of a drop in high energy cosmic ray flux consistent with the GZK cutoff by HiRes and the Pierre Auger Observatory. Funding to develop the instrumentation and install the first prototypes has been granted, and the first components of ARA were installed during the austral summer of 2010–2011. Within 3 years of commencing operation, the full ARA will exceed the sensitivity of any other instrument in the 0.1-10 EeV energy range by an order of magnitude. The primary goal of the ARA array is to establish the absolute cosmogenic neutrino flux through a modest number of events. This information would frame the performance requirements needed to expand the array in the future to measure a larger number of neutrinos with greater angular precision in order to study their spectrum and origins.

scholarly journals Investigating an angular correlation between nearby starburst galaxies and UHECRs with the Telescope Array experiment

2019 ◽  
Vol 210 ◽  
pp. 01007
Author(s):  
Armando di Matteo ◽  
Toshihiro Fujii ◽  
Kazumasa Kawata
Keyword(s):  
Northern Hemisphere ◽  
Cosmic Ray ◽  
Starburst Galaxies ◽  
Pierre Auger Observatory ◽  
Model Parameters ◽  
Test Statistic ◽  
Telescope Array ◽  
Cosmic Ray Flux ◽  
Best Fit ◽  
Rule Out

The arrival directions of cosmic rays detected by the Pierre Auger Observatory (Auger) with energies above 39 EeV were recently reported to correlate with the positions of 23 nearby starburst galaxies (SBGs): in their best-fit model, 9.7% of the cosmic-ray flux originates from these objects and undergoes angular diffusion on a 12.9o scale. On the other hand, some of the SBGs on their list, including the brightest one (M82), are at northern declinations outside the Auger field of view. Data from detectors in the northern hemisphere would be needed to look for cosmic-ray excesses near these objects. In this work, we tested the Auger best-fit model against data collected by the Telescope Array (TA) in a 9-year period, without trying to re-optimize the model parameters for our dataset in order not to introduce statistical penalties. The resulting test statistic (double loglikelihood ratio) was – 1.00, corresponding to 1.1σ significance among isotropically generated random datasets, and to – 1.4σ significance among ones generated assuming the Auger best-fit model. In other words, our data is still insufficient to conclusively rule out either hypothesis. The ongoing fourfold expansion of TA will collect northern hemisphere data with much more statistics, improving our ability to discriminate between different flux models.

scholarly journals Cosmic ray flux and lockdown due to COVID-19 in Kolkata – Any correlation?

Pramana ◽  
2021 ◽  
Vol 95 (2) ◽  
Author(s):  
A Sen ◽  
S Chatterjee ◽  
S Roy ◽  
R Biswas ◽  
S Das ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Cosmic Ray Flux

A correction to previously quoted cosmic ray flux values

1957 ◽  
Vol 6 (3) ◽  
pp. 748-750 ◽  
Author(s):  
C. J. Waddington
Keyword(s):  
Cosmic Ray ◽  
Cosmic Ray Flux

UHE cosmic ray detection with the Pierre Auger observatory

2005 ◽  
Vol 52 (6) ◽  
pp. 2773-2777
Author(s):  
M. Kleifge ◽  
H. Gemmeke
Keyword(s):  
Cosmic Ray ◽  
Pierre Auger Observatory

Long-term negative trend in cosmic ray flux

2000 ◽  
Vol 105 (A1) ◽  
pp. 9-17 ◽  
Author(s):  
Yuri I. Stozhkov ◽  
Peter E. Pokrevsky ◽  
Victor P. Okhlopkov
Keyword(s):  
Cosmic Ray ◽  
Negative Trend ◽  
Cosmic Ray Flux

At the Doorway to UHE Cosmic Ray Astronomy—Recent Results from the Pierre Auger Observatory—

2008 ◽  
Author(s):  
K.-H. Kampert ◽  
Felix A. Aharonian ◽  
Werner Hofmann ◽  
Frank Rieger ◽  
Keyword(s):  
Cosmic Ray ◽  
Pierre Auger Observatory

scholarly journals Probing the Galactic cosmic ray flux with submillimeter and gamma ray data

2008 ◽  
Author(s):  
S. Casanova ◽  
S. Gabici ◽  
F. A. Aharonian ◽  
K. Torii ◽  
Y. Fukui ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Cosmic Ray ◽  
Galactic Cosmic Ray ◽  
Cosmic Ray Flux
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