Results 51 to 60 of about 19,622 (273)

The energy spectrum of ultra-high energy cosmic rays measured at the Pierre Auger Observatory and the Telescope Array

open access: yesEPJ Web of Conferences, 2023
In the study of cosmic rays, the measurement of the energy spectrum of the primaries is one of the main issues and provides fundamental information on the most energetic phenomena in the Universe.
D. Bergman   +12 more
semanticscholar   +1 more source

Search for photons above 1019 eV with the surface detector of the Pierre Auger Observatory [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics, 2022
We use the surface detector of the Pierre Auger Observatory to search for air showers initiated by photons with an energy above 1019 eV. Photons in the zenith angle range from 30∘ to 60∘ can be identified in the overwhelming background of showers ...
T. P. A. C. P. Abreu   +366 more
semanticscholar   +1 more source

A 3‐Year Sample of Almost 1,600 Elves Recorded Above South America by the Pierre Auger Cosmic‐Ray Observatory

open access: yesEarth and Space Science, Volume 7, Issue 4, April 2020., 2020
Abstract Elves are a class of transient luminous events, with a radial extent typically greater than 250 km, that occur in the lower ionosphere above strong electrical storms. We report the observation of 1,598 elves, from 2014 to 2016, recorded with unprecedented time resolution (100 ns) using the fluorescence detector (FD) of the Pierre Auger Cosmic ...
A. Aab   +389 more
wiley   +1 more source

A next-generation ground array for the detection of ultrahigh-energy cosmic rays: the Fluorescence detector Array of Single-pixel Telescopes (FAST) [PDF]

open access: yesEPJ Web of Conferences, 2019
The origin and nature of ultrahigh-energy cosmic rays (UHECRs) is one of the most intriguing and important mysteries in astroparticle physics. The two largest observatories currently in operation, the Telescope Array Experiment in central Utah, USA, and ...
Fujii Toshihiro   +18 more
doaj   +1 more source

Combined fit to the spectrum and composition data measured by the Pierre Auger Observatory including magnetic horizon effects

open access: yesInternational Conference on Rebooting Computing, 2023
The measurements by the Pierre Auger Observatory of the energy spectrum and mass composition of cosmic rays can be interpreted assuming the presence of two extragalactic source populations, one dominating the flux at energies above a few EeV and the ...
Juan M. Gonzalez   +380 more
semanticscholar   +1 more source

Where Is the Bottom of a Watershed?

open access: yesWater Resources Research, Volume 56, Issue 3, March 2020., 2020
Abstract Watersheds have served as one of our most basic units of organization in hydrology for over 300 years (Dooge, 1988, https://doi.org/10.1080/02626668809491223; McDonnell, 2017, https://doi.org/10.1038/ngeo2964; Perrault, 1674, https://www.abebooks.com/first‐edition/lorigine‐fontaines‐Perrault‐Pierre‐Petit‐Imprimeur/21599664536/bd). With growing
Laura E. Condon   +5 more
wiley   +1 more source

Search for primary photons at tens of PeV with the Pierre Auger Observatory

open access: yesInternational Conference on Rebooting Computing, 2023
The observation of primary photons with energies around 10 16 eV would be particularly interesting after the discovery of Galactic gamma-ray sources with spectra extending into the PeV range.
N. González   +379 more
semanticscholar   +1 more source

TRY plant trait database – enhanced coverage and open access

open access: yesGlobal Change Biology, Volume 26, Issue 1, Page 119-188, January 2020., 2020
Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people.
Jens Kattge   +728 more
wiley   +1 more source

Impact of the magnetic horizon on the interpretation of the Pierre Auger Observatory spectrum and composition data [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics
The flux of ultra-high energy cosmic rays reaching Earth above the ankle energy (5 EeV) can be described as a mixture of nuclei injected by extragalactic sources with very hard spectra and a low rigidity cutoff.
T. P. A. A. Halim   +365 more
semanticscholar   +1 more source

Measurement of the mass composition of ultra-high-energy cosmic rays at the Pierre Auger Observatory

open access: yesInternational Conference on Rebooting Computing, 2023
After nearly 20 years of data-taking, the measurements made with the Pierre Auger Observatory represent the largest collection of ultra-high-energy cosmic ray (UHECR) data so far assembled from a single instrument. Exploring this data set led to a deeper
E. Mayotte   +379 more
semanticscholar   +1 more source

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