Comparison of the ultrahigh energy cosmic ray flux observed by AGASA, HiRes, and Auger

2006 ◽  
Vol 74 (4) ◽  
Author(s):  
B. M. Connolly ◽  
S. Y. BenZvi ◽  
C. B. Finley ◽  
A. C. O’Neill ◽  
S. Westerhoff
Keyword(s):  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
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 PeV Emission of the Crab Nebula: Constraints on the Proton Content in Pulsar Wind and Implications

2021 ◽  
Vol 922 (2) ◽  
pp. 221
Author(s):  
Ruo-Yu Liu ◽  
Xiang-Yu Wang
Keyword(s):  
Energy Content ◽  
Crab Nebula ◽  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
Pulsar Wind Nebulae ◽  
Air Shower ◽  
Pulsar Wind ◽  
The Crab Nebula ◽  
Pulsar Winds ◽  
Cosmic Ray Flux

Abstract Recently, two photons from the Crab Nebula with energy of approximately 1 PeV were detected by the Large High Altitude Air Shower Observatory (LHAASO), opening an ultrahigh-energy window for studying pulsar wind nebulae (PWNe). Remarkably, the LHAASO spectrum at the highest-energy end shows a possible hardening, which could indicate the presence of a new component. A two-component scenario with a main electron component and a secondary proton component has been proposed to explain the whole spectrum of the Crab Nebula, requiring a proton energy of 1046–1047 erg remaining in the present Crab Nebula. In this paper, we study the energy content of relativistic protons in pulsar winds using the LHAASO data of the Crab Nebula, considering the effect of diffusive escape of relativistic protons. Depending on the extent of the escape of relativistic protons, the total energy of protons lost in the pulsar wind could be 10–100 times larger than that remaining in the nebula presently. We find that the current LHAASO data allow up to (10–50)% of the spindown energy of pulsars being converted into relativistic protons. The escaping protons from PWNe could make a considerable contribution to the cosmic-ray flux of 10–100 PeV. We also discuss the leptonic scenario for the possible spectral hardening at PeV energies.

scholarly journals Limit on the ultrahigh-energy cosmic-ray flux with the Westerbork synthesis radio telescope

2010 ◽  
Vol 82 (10) ◽  
Author(s):  
S. ter Veen ◽  
S. Buitink ◽  
H. Falcke ◽  
C. W. James ◽  
M. Mevius ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
Cosmic Ray Flux

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

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

scholarly journals Testing Lorentz invariance with the ultrahigh energy cosmic ray spectrum

2009 ◽  
Vol 79 (8) ◽  
Author(s):  
Xiao-Jun Bi ◽  
Zhen Cao ◽  
Ye Li ◽  
Qiang Yuan
Keyword(s):  
Lorentz Invariance ◽  
Cosmic Ray ◽  
Ultrahigh Energy

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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