Results 21 to 30 of about 2,211 (159)

Revisiting Hybrid Interferometry With Low-Frequency Radio Astronomy Arrays [PDF]

IEEE Transactions on Antennas and Propagation, 2017
Radio interferometry most commonly involves antennas or antenna arrays of identical design. The identical antenna assumption leads to a convenient and useful mathematical simplification resulting in a scalar problem. An interesting variant to this is a "hybrid" interferometer involving two designs.
Adrian T. Sutinjo, Daniel C. X. Ung, Tim M. Colegate, Randall B. Wayth, Peter J. Hall, Eloy de Lera Acedo   +5 more
openaire   +3 more sources

THE UNIVERSE RADIO EMISSION AT DECAMETER WAVELENGTHS (by the materials of a series of works awarded by the State Prize of Ukraine in the field of science and technology in 2018)

Radio Physics and Radio Astronomy, 2019
Purpose: The abstract presentation and review of the works of the last 40 years in the field of low-frequency radio astronomy and a summary of their main scientific and technical results, which have been awarded the State Prize of Ukraine in the field of
O. O. Konovalenko, V. V. Zakharenko, M. M. Kalinichenko, V. M. Melnik, M. A. Sidorchuk, A. A. Stanislavsky, S. V. Stepkin, O. M. Ulyanov   +7 more
doaj   +1 more source

Cosmic-Ray Acceleration and Magnetic Fields in Galaxy Clusters and Beyond: Insights from Radio Observations

Universe, 2023
The discovery of diffuse radio emission in galaxy clusters proved the existence of energetic cosmic-ray electrons and cosmic magnetic fields on Mpc-scales in the Universe.
Denis Wittor
doaj   +1 more source

INTERSTELLAR MEDIUM AND DECAMETER RADIO SPECTROSCOPY [PDF]

Radio Physics and Radio Astronomy, 2021
Purpose: The analytical review of the main results of research in the new direction of the low-frequency radio astronomy, the interstellar medium radio spectroscopy at decameter waves, which had led to astrophysical discovery, recording of the radio ...
S. V. Stepkin, O. O. Konovalenko, Y. V. Vasylkivskyi, D. V. Mukha   +3 more
doaj   +1 more source

The Radio Astronomy Explorer Satellite, a Low‐Frequency Observatory [PDF]

Radio Science, 1971
The Radio Astronomy Explorer satellite (RAE‐1) is the first spacecraft designed exclusively for radio astronomical studies. It is a small, but relatively complex, observatory including two 229‐meter antennas, several radiometer systems covering a frequency range of 0.2 to 9.2 MHz, and a variety of supporting experiments such as antenna impedance probes
R. R. Weber, J. K. Alexander, R. G. Stone   +2 more
openaire   +1 more source

Ageing Characterization Under Thermal Test of a Receiver Unit for a Radio Telescope

IEEE Open Journal of Instrumentation and Measurement, 2022
The Square Kilometer Array low (SKAlow) is an outstanding project aiming at building the world’s largest and most sensitive radio telescope. The Australian Murchison Shire desert has been chosen as location for the low-frequency antennas because ...
Marcantonio Catelani, Lorenzo Ciani, Gabriele Patrizi, Roberto Singuaroli, Jader Monari, Federico Perini   +5 more
doaj   +1 more source

ULF wave effects on high frequency signal propagation through the ionosphere [PDF]

Annales Geophysicae, 2009
Variations in the total electron content (TEC) of the ionosphere alter the propagation characteristics of EM radiation for frequencies above a few megahertz (MHz).
C. L. Waters, S. P. Cox
doaj   +1 more source

Test-Driven Design of an Active Dual-Polarized Log-Periodic Antenna for the Square Kilometre Array

IEEE Open Journal of Antennas and Propagation, 2020
An active dual-polarized Log-Periodic antenna has been designed to meet the requirements of the low-frequency (50 - 350 MHz) radio telescope of the Square Kilometre Array (SKA).
Pietro Bolli, Lorenzo Mezzadrelli, Jader Monari, Federico Perini, Alberto Tibaldi, Giuseppe Virone, Mirko Bercigli, Lorenzo Ciorba, Paola Di Ninni, Maria Grazia Labate, Vittorio Giuseppe Loi, Andrea Mattana, Fabio Paonessa, Simone Rusticelli, Marco Schiaffino   +14 more
doaj   +1 more source

First Radio Astronomy Examination of the Low-Frequency Broadband Active Antenna Subarray

Advances in Astronomy, 2014
We present the 25-element active antenna array and its remote control in the framework of the GURT project, the Ukrainian Radio Telescope of a new age. To implement beamforming, the array is phased with the help of discrete cable delay lines in analog ...
A. A. Stanislavsky, I. N. Bubnov, A. A. Konovalenko, A. A. Gridin, V. V. Shevchenko, L. A. Stanislavsky, D. V. Mukha, A. A. Koval   +7 more
doaj   +1 more source

Ultimate precision in cosmic-ray radio detection — the SKA

EPJ Web of Conferences, 2017
As of 2023, the low-frequency part of the Square Kilometre Array will go online in Australia. It will constitute the largest and most powerful low-frequency radio-astronomical observatory to date, and will facilitate a rich science programme in astronomy
Huege Tim, Bray Justin D., Buitink Stijn, Butler David, Dallier Richard, Ekers Ron D., Enßlin Torsten, Falcke Heino, Haungs Andreas, James Clancy W., Martin Lilian, Mitra Pragati, Mulrey Katharine, Nelles Anna, Revenu Benoît, Scholten Olaf, Schröder Frank G., Tingay Steven, Winchen Tobias, Zilles Anne   +19 more
doaj   +1 more source