Astrophysical Studies With Small Low-Frequency Radio Telescopes of New Generation

12th Workshop Solar Influences...

“…As at the end of 2020, there is no phasing system for subarrays yet, it is possible to use either one subarray or two subarrays with multiplying signals of one polarization. Possibilities of electronic scanning in wide sectors, high sensitivity in a wide frequency range and high interference immunity have allowed experiments to be carried out by using only one or two subarrays (observations of sporadic solar and planetary radio emission or observations of radio pulsars) [Konovalenko et al, 2016 a, b]. The aim of this paper is to estimate the perspectives of using the radio telescope GURT for the study of the interplanetary scintillations.…”

“…IPS observation also is a powerful tool for studying interplanetary coronal mass ejections (ICME) and other solar wind disturbances connected with solar activity. At decameter wavelengths IPS observations are regularly carried out in Institute of Radio Astronomy of NAS of Ukraine by using UTR-2 -URAN radio telescopes [Konovalenko et al, 2016 a] for the last 20 years [Kalinichenko, 2009;Falkovich et al, 2010;Kalinichenko et al, 2017;Kalinichenko et al, 2019]. Now for IPS observations it is possible to use two subarrays of the radio telescope GURT with multiplying signals of one polarization.…”

“…The increased interest is accompanied by the construction of a number of new unique radio telescopes such as Low Frequency Array (LOFAR), the Netherlands, 30 to 80 and 110 to 240 MHz [van Haarlem et al, 2013], the Long Wavelength Array (LWA), USA, 10 to 88 MHz [Taylor et al, 2012], the Murchison Wide-field Array (MWA), Australia, 80 to 300 MHz, new extension in Nançay Upgrading LOFAR (Nenu-FAR), France, 10 to 85MHz [Zarka et al, 2012]. A similar radio telescope GURT is being created in Ukraine [Konovalenko et al, 2016 a, b]. These instruments are already being used for investigations of the Sun, the Earth's ionosphere, and solar-terrestrial connections.…”

Stellar Flares, Superflares and Coronal Mass Ejections – Entering the Big Data Era

“…But already in the 1990s single channel receivers used at very few frequencies were used to identify stellar activity from the prominent active stars AD Leo and EV Lac using the Ukrainian T-shaped radio array second modifications (UTR-2). Some years later [153][154][155] repeated those observations but this time with multi-channel receivers, resulting in a number of bursts, the majority being similar to solar type III bursts and some having a high probability to be of stellar origin. Again a few years later the search for type II bursts continued, but either no bursts were detected [156] or the deduced parameters did not match expected parameters from coronal models which led the authors to conclude that CMEs on other stars than the Sun are rare [157,158].…”