Abstract
The Tunka Radio Extension (Tunka-Rex) is a digital radio array operating in the frequency band of 30-80 MHz and detecting radio emission from air-showers produced by cosmic rays with energies above 100 PeV. The experimentis installed at the site of the TAIGA (Tunka Advanced Instrument for cosmic rays and Gamma Astronomy) observatory and performs joint measurements with the co-located particle and air-Cherenkov detectors in passive mode receiving a trigger from the latter. Tunka-Rex collects data since 2012, and during the last five years went throughseveral upgrades. As a result the density of the antenna field was increased by three times since its commission. In this contribution we present the latest results of Tunka-Rex experiment, particularly an updated analysis and efficiency study, which have been applied to the measurement of the mean shower maximum as a function of energy for cosmic rays of energies up to EeV. The future plans are also discussed: investigations towards an energy spectrum of cosmic rays with Tunka-Rex and their mass composition using a combination of Tunka-Rex data with muon measurements by the particle detector Tunka-Grande.
Highlights
Digital radio arrays are fast developing instruments for measuring ultra-high energy astrophysical messengers in PeV-EeV range [1, 2]
While the first and second generation setups were focused on technological developments and cosmic ray measurements, the generation radio array will aim on PeV-gamma
In this work we review the status and highlight the latest results of the Tunka Radio Extension, part of the second generation setup mentioned above, which has proven the feasibility of ultra-high energy cosmic ray detection with a sparse radio arrays and obtained several important results, which have boosted the development of this technique
Summary
Digital radio arrays are fast developing instruments for measuring ultra-high energy astrophysical messengers in PeV-EeV range [1, 2]. Tunka Radio Extension (Tunka-Rex) is a digital antenna array located at the Tunka Advanced Instrument for cosmic rays and Gamma Astronomy (TAIGA) observatory [5]. Tunka-Rex has been commissioned in 2012 with 18 antenna stations triggered by air-Cherenkov array Tunka-133.
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