SPORADIC RADIO EMISSION OF SPACE OBJECTS AT LOW-FREQUENCIES
| Autor: | I. Y. Vasylieva, O. M. Ulyanov, Lpc E, V. V. Zakharenko, Serge Yerin, V. Yu. Kharlanova, I. P. Kravtsov, Jean-Mathias Grießmeier, Lesia, Observatoire de Paris, Cnrs, Psl, Upd, P. Zarka, K. Yu. Mylostna, M. A. Sydorchuk, V. A. Shevchenko, Upmc, A. I. Shevtsova, Georg Fischer, O. O. Konovalenko, Helmut O. Rucker, Vladimir B. Ryabov, A. O. Skoryk, M. M. Kalinichenko |
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| Přispěvatelé: | Institute of Radio Astronomy of NASU [Kharkiv] (IRA), National Academy of Sciences of Ukraine (NASU), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Unité Scientifique de la Station de Nançay (USN), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Solar System
transients 010504 meteorology & atmospheric sciences Physics and Astronomy (miscellaneous) Astrophysics::High Energy Astrophysical Phenomena Astronomy QB1-991 Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics UTR-2 01 natural sciences Electromagnetic interference lightning in the atmospheres of planets Jupiter Radio telescope sporadic radio emission Interference (communication) Pulsar Planet 0103 physical sciences Electrical and Electronic Engineering 010303 astronomy & astrophysics 0105 earth and related environmental sciences Physics decameter wavelength range utr-2 jupiter s-bursts Astronomy and Astrophysics 13. Climate action Space and Planetary Science [SDU]Sciences of the Universe [physics] Astrophysics::Earth and Planetary Astrophysics Jupiter S-bursts Noise (radio) |
| Zdroj: | Radio Physics and Radio Astronomy, Vol 26, Iss 2, Pp 99-129 (2021) Radio physics and radio astronomy Radio physics and radio astronomy, National Academy of Sciences of Ukraine, Institute of Radio Astronomy, Ukrainian Committee URSI/Begell, 2021, 26 (2), pp.99-129. ⟨10.15407/rpra26.02.099⟩ |
| ISSN: | 1027-9636 |
| Popis: | International audience; Purpose: The results of studies of sporadic radio emission of several types of space radio sources, including neutron stars and planets of the Solar System, are presented. The aim of this work is to review the latest achievements in the study of low-frequency radio emission of the Solar System planets and transient signals similar to pulsar pulses using the UTR-2 radio telescope. The importance of the development of the verification methods of the spaceborne radio emission in the study of sporadic signals from various sources is shown. Design/methodology/approach: The studies of sporadic signals of different nature are based on the common set of procedures for cleaning records from the terrestrial radio frequency interference (RFI) in the frequency-time pattern using the information on the nature of the particular type of sporadic radio emission, possible types of interference and signal distortion. Characteristic features of sporadic radio emission of different sources are given, and for each of them the optimal method of signal extraction is developed. The efficiency of the developed procedures for cleaning from noise using adjustable parameters is shown. This is done on the basis of observations of diverse types of space radio sources, such as lightnings in the atmospheres of planets, single pulses of neutron stars and sporadic radio emission of Jupiter. Findings: The developed methods of signal extraction detection in the presence of radio-interference have allowed obtaining the unique results such as: the distribution of the total intensity of single pulses of neutron stars depending on the galactic latitude; the automatic search of lightnings in the Saturn’s atmosphere in data due to the carefully elaborated RFI mitigation procedures, which made it possible to obtain the Saturn electrostatic discharge (SED) emission parameters based on the most complete set of events. Increased efficiency of the selection of Jupiter’s S-radiation signals despite the data corruption by the presence of radio-interference, which was reached due to the carefully chosen parameters of data cleaning procedures, have allowed us to detect short and intensive bursts, being the most informative for determining the physical parameters of radio emission in the area of their generation. Conclusions: The large effective area and high sensitivity of the UTR-2 radio telescope allow making the sporadic radio emission study with high temporal and frequency resolutions. Due to these factors we can apply a wide range of methods of space signals’ detection in the presence of terrestrial radio-frequency interference of natural and artificial origin. The data cleaning parameters allow accounting for the characteristic features of space signals and to obtain important and even unique scientific results. Key words: decameter wavelength range; UTR-2; sporadic radio emission; transients; lightning in the atmospheres of planets; Jupiter S-bursts |
| Databáze: | OpenAIRE |
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