English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report on a measurement of the cosmic ray energy spectrum by the TelescopeArray Low-Energy Extension (TALE) air fluorescence detector. The TALE airfluorescence detector is also sensitive to the Cherenkov light produced byshower particles. Low energy cosmic rays, in the PeV energy range, aredetectable by TALE as "Cherenkov Events". Using these events, we measure theenergy spectrum from a low energy of $\sim 2$ PeV to an energy greater than 100PeV. Above 100 PeV TALE can detect cosmic rays using air fluorescence. Thisallows for the extension of the measurement to energies greater than a few EeV.In this paper, we will describe the detector, explain the technique, andpresent results from a measurement of the spectrum using $\sim 1000$ hours ofobservation. The observed spectrum shows a clear steepening near $10^{17.1}$eV, along with an ankle-like structure at $10^{16.2}$ eV. These featurespresent important constraints on galactic cosmic rays origin and propagationmodels. The feature at $10^{17.1}$ eV may also mark the end of the galacticcosmic rays flux and the start of the transition to extra-galactic sources.