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Radio antennas have become a standard tool for the detection of cosmic-ray air showers in the energy range above $10^{16}\,$eV. The radio signal of these air showers is generated mostly due to the deflection of electrons and positrons in…

High Energy Astrophysical Phenomena · Physics 2025-10-28 Frank G. Schröder

Sensitive radio instruments are optimized for observing faint astronomical sources, and usually need to attenuate the received signal when observing the Sun. There are only a handful of flux density calibrators which can comfortably be…

Solar and Stellar Astrophysics · Physics 2022-03-03 Devojyoti Kansabanik , Surajit Mondal , Divya Oberoi , Ayan Biswas , Shilpi Bhunia

The nature of ultrahigh-energy cosmic rays (UHECRs) at energies >10^20 eV remains a mystery. They are likely to be of extragalactic origin, but should be absorbed within ~50 Mpc through interactions with the cosmic microwave background. As…

Astrophysics · Physics 2009-11-11 H. Falcke , W. D. Apel , A. F. Badea

Typical radio interferometer observations are performed assuming the source of radiation to be in the far-field of the instrument, resulting in a two-dimensional Fourier relationship between the observed visibilities in the aperture plane…

Instrumentation and Methods for Astrophysics · Physics 2023-10-31 Steve Prabu , Steven J. Tingay , Andrew Williams

Firm evidence for a radio emission counterpart of cosmic ray air showers is presented. By the use of an antenna array set up in coincidence with ground particle detectors, we find a collection of events for which both time and arrival…

The recent demonstration by the CODALEMA Collaboration of the ability of the radio-detection technique for the characterization of UHE cosmic-rays calls for the use of this powerful method for the observation of UHE neutrinos. For this…

Instrumentation and Methods for Astrophysics · Physics 2010-04-30 Daniel Ardouin , Didier Charrier , Pascal Lautridou , Olivier Martineau-Huynh , Olivier Ravel , Xiang-Ping Wu , Meng Zhao

We report on the design, deployment, and first results from a scintillation detector deployed at the Murchison Radio-astronomy Observatory (MRO). The detector is a prototype for a larger array -- the Square Kilometre Array Particle Array…

We present a search for prompt radio emission associated with the short-duration gamma-ray burst (GRB) 150424A using the Murchison Widefield Array (MWA) at frequencies from 80-133 MHz. Our observations span delays of 23 s-30 min after the…

High Energy Astrophysical Phenomena · Physics 2015-12-02 D. L. Kaplan , A. Rowlinson , K. W. Bannister , M. E. Bell , S. D. Croft , T. Murphy , S. J. Tingay , R. B. Wayth , A. Williams

We investigate the correlation between the integrated low-frequency and infrared (IR) emissions of star-forming galaxies extracted from the {\sl Herschel} Reference Survey. By taking advantage of the GaLactic Extragalactic All-sky MWA…

Astrophysics of Galaxies · Physics 2022-04-05 Tsutomu T. Takeuchi , Shuntaro A. Yoshida , Luca Cortese , O. Ivy Wong , Barbara Catinella , Suchetha Cooray

Calibration of instrumental polarization is critical for measuring polarized radio emissions from astrophysical sources to extract the magnetic field information in astrophysical, heliospheric, and terrestrial plasmas. At meter wavelengths,…

Instrumentation and Methods for Astrophysics · Physics 2025-05-08 Devojyoti Kansabanik , Angelos Vourlidas , Soham Dey , Surajit Mondal , Divya Oberoi

We characterize the low frequency radio-frequency interference (RFI) environment at the Murchison Radio-astronomy Observatory (MRO), the location selected for the low-frequency component of the Square Kilometre Array. Data were collected…

Instrumentation and Methods for Astrophysics · Physics 2018-11-07 Marcin Sokolowski , Randall B. Wayth , Morgan Lewis

The LOFAR radio telescope is able to measure the radio emission from cosmic ray induced air showers with hundreds of individual antennas. This allows for precision testing of the emission mechanisms for the radio signal as well as…

High Energy Astrophysical Phenomena · Physics 2019-05-22 T Winchen , A Bonardi , S Buitink , A Corstanje , H Falcke , B M Hare , J R Hörandel , P Mitra , K Mulrey , A Nelles , J P Rachen , L Rossetto , P Schellart , O Scholten , S ter Veen , S Thoudam , T N G Trinh

LOFAR (Low Frequency Array) is an innovative radio telescope optimized for the frequency range 30-240 MHz. The telescope is realized as a phased aperture array without any moving parts. Digital beam forming allows the telescope to point to…

The recent availability of fine grained high sensitivity data from the new generation low radio frequency instruments such as the Murchison Widefield Array (MWA) have opened up opportunities for using novel techniques for characterizing the…

Solar and Stellar Astrophysics · Physics 2018-01-24 Rohit Sharma , Divya Oberoi , Mihir Arjunwadkar

We present the design, implementation and data taking performance of the MIcrowave Detection of Air Showers (MIDAS) experiment, a large field of view imaging telescope designed to detect microwave radiation from extensive air showers…

We present a demonstration version of a commensal pipeline for Fast Radio Burst (FRB) searches using a real-time incoherent beam from the Murchison Widefield Array (MWA). The main science target of the pipeline are bright nearby FRBs from…

High Energy Astrophysical Phenomena · Physics 2024-01-10 M. Sokolowski , I. S. Morrison , D. Price , G. Sleap , B. Crosse , A. Williams , L. Williams , C. James , B. W. Meyers , S. McSweeney , N. D. R. Bhat , G. Anderson

The radio technique for the detection of high energy cosmic rays consists in measuring the electric field created by the particle showers created inside a medium by the primary cosmic ray. The electric field is then used to infer the…

High Energy Astrophysical Phenomena · Physics 2018-05-23 Daniel García-Fernández , Benoît Revenu , Didier Charrier , Richard Dallier , Antony Escudie , Lilian Martin

We examine data from the Murchison Widefield Array (MWA) in the frequency range 72 -- 102 MHz for a field-of-view that serendipitously contained the interstellar object 'Oumuamua on 2017 November 28. Observations took place with time…

We present deep upper limits from the 2014 Murchison Widefield Array (MWA) Phase I observing season, with a particular emphasis on identifying the spectral fingerprints of extremely faint radio frequency interference (RFI) contamination in…