Results 31 to 40 of about 74,044 (308)

INVESTIGATIONS OF COSMIC SOURCES RADIOEMISSION SCINTILLATIONS DUE TO INTERPLANETARY PLASMA IRREGULARITIES AT THE INSTITUTE OF RADIO ASTRONOMY, NAS UKRAINE [PDF]

Radio Physics and Radio Astronomy, 2021
Purpose: Review of investigations of cosmic sources radioemission scintillations due to interplanetary plasma irregularities made at the Institute of Radio Astronomy of the National Academy of Sciences of Ukraine, from the first observations in the mid ...
M. M. Kalinichenko, N. V. Kuhai, O. O. Konovalenko, A. I. Brazhenko, I. M. Bubnov, S. M. Yerin, H. O. Rucker, P. Zarka, A. Lecacheux, O. L. Ivantyshyn, O. O. Lytvynenko, O. I. Romanchuk, A. V. Frantsuzenko   +12 more
doaj   +1 more source

The study on the effect of population density on radio frequency interference (RFI) analysis on dynamic spectrum at selected CALLISTO stations

Physical Sciences and Technology, 2021
Radio Frequency Interference (RFI) has become a critical issue in radio astronomy observation in recent years. Compact Astronomical Low-Cost Instrument for Spectroscopy in Transportable Observatories (CALLISTO) is a worldwide network of spectrometer ...
Z. N Zainud-din, N. H Sabri, R. Umar, C. Monstein   +3 more
doaj   +3 more sources

Investigation of the Sudden Solar Ionospheric Disturbance using Radio Telescope [PDF]

EPJ Web of Conferences, 2020
Low-frequency radio telescopes are cheap and useful devices for the investigation of terrestrial and extra-terrestrial emissions. These emissions come either from the Sun and the planet Jupiter to terrestrial emissions.
Aqasha Adam, Zheng Andrien, Athreya Sneha, Tan Hoe Teck   +3 more
doaj   +1 more source

Cold-Source Noise Measurement of a Differential Input Single-Ended Output Low-Noise Amplifier Connected to a Low-Frequency Radio Astronomy Antenna [PDF]

IEEE Transactions on Antennas and Propagation, 2018
We present two methods for measuring the noise temperature of a differential input single-ended output low-noise amplifier (DISO LNA) connected to an antenna.
A. Sutinjo, D. Ung, B. Juswardy
semanticscholar   +1 more source

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

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

Radio physics and radio astronomy

, 2021
International audiencePurpose: Review of investigations of cosmic sources radioemission scintillations due to interplanetary plasma irregularities made at the Institute of Radio Astronomy of the National Academy of Sciences of Ukraine, from the first ...
Brazhenko, A, I, Ivantyshyn Karpenko, O, L, Lytvynenko, O, O, Zarka, P, Lesia, A, Lecacheux, Institute, Physiko-Mechanical, Kuhai, N, V, Kalinichenko, M, M, Romanchuk, O, I, Frantsuzenko, A, V, Bubnov, I, M, Yerin, S, M, Rucker, H, O, Konovalenko, O, O   +13 more
core   +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