V. V. Zakharenko, I. P. Kravtsov, I. Y. Vasylieva, A. A. Konovalenko, O. M. Ulyanov, V. L. Kolyadin


PACS numbers: 97.60.Gb,

Purpose: The most challenging problem of transient signal research is to prove their cosmic origin. There is no radio telescope at decameter wavelengths, which has an effective area (i.e. instantaneous sensitivity) at least close to the UTR-2 radio telescope parameters. This fact excludes the possibility of confirming the cosmic origin of detected low-intensity signals at some other independent radio telescope of this frequency range. Therefore, it is impossible to overestimate the importance of carrying out all possible kinds of tests to check the probable interference origin of candidate signals. In this work we analyze the distributions of detected transient signals parameters and search for possible low-intensity interference in the decameter pulsars and transient sources survey of the northern sky observational data.

Design/methodology/approach: Search for interference caused by ionospheric plasma-related scintillations, with a time-frequency response symmetrical to signals with dispersion delay induced by interstellar medium.

Findings: Distributions of signal-to-noise ratios and dispersion measures appear to be very different for transient signals detected in the survey and the hypothetical interference with the same absolute value of shift in arrival time between a lower and a higher frequency, but its opposite sign. This supports the hypothesis of the transient signals detected in the survey being generated by cosmic radio sources.

Conclusions: Broadening of radio emission cone of various types of neutron stars along with high angular and temporal scattering at decameter wavelengths could explain the large number of individual signals at unique dispersion measures, and, hence, a large number of transient emission sources.

Key words: survey, single pulse, radio frequency interference, dispersion measure, scintillations, decameter wavelengths 

Manuscript submitted  19.04.2018

Radio phys. radio astron. 2018, 23(2): 79-93 


1. ZAKHARENKO, V. V., 2011. Sporadic emission of radio astronomy sources and its study at decameter wavelengths. Radio Phys. Radio Astron. vol. 16., no. 2, pp. 121–134 (in Russian)

2. ZAKHARENKO, V. V., KRAVTSOV, I. P., VASYLIEVA, I. Y., MYKHAILOVA, S. S., ULYANOV, O. M., SHEVTSOVA, A. I., SKORYK, A. O., ZARKA, P. and KONOVALENKO, O. O., 2015. Decameter pulsars and transients survey of the northern sky. Status, first results, multiparametric pipeline for candidate selection. Odessa Astronomical publications. vol. 28, is. 2, pp. 252–255. DOI:

3. ZAKHARENKO, V. V., KRAVTSOV, I. P. and VASYLIEVA, I. Y., 2017. Decameter pulsar/transient survey of Northern sky. Parameters of individual pulses. Radio Phys. Radio Astron. vol. 22, no. 1, pp. 31–44 (in Russian). DOI:

4. VASYLIEVA, I. Y., ZAKHARENKO, V. V., ZARKA, P., ULYANOV, O. M., SHEVTSOVA, A. I. and SEREDKINA, A. A., 2013. Data processing pipeline for decameter pulsar/transient survey. Odessa Astronomical publications. vol. 26, is. 2, pp. 159–161.

5. VASYLIEVA, I. Y., ZAKHARENKO, V. V., KONOVALENKO, A. A., ZARKA, P., ULYANOV, O. M., SHEVTSOVA, A. I. and SKORYK, A. O., 2014. Decameter Pulsar/Transient Survey of Northern Sky. First Results. Radio Phys. Radio Astron. vol. 19, no. 3, pp. 197–205. DOI:

6. VASYLIEVA, I. Y., 2015. Pulsars and transients survey, and exoplanet search at low-frequencies with the UTR-2 radio telescope: methods and first results [online]. Phd Thesis ed. Observatoire de Paris [viewved 19 April 2018]. Available from:

7. KRAVTSOV, I. P., ZAKHARENKO, V. V., VASYLIEVA, I. Y., MYKHAILOVA, S. S., ULYANOV, O. M., SHEVTSOVA, A. I. and SKORYK, A. O., 2016. Parameters of the transient signals detected in the decameter survey of the northern sky. Odessa Astronomical publications. vol. 29, pp. 179–183. DOI:

8. PETROFF, E., KEANE, E. F., BARR, E. D., REYNOLDS, J. E., SARKISSIAN, J., EDWARDS, P. G., STEVENS, J., BREM, C., JAMESON, A., BURKE-SPOLAOR, S., JOHNSTON, S., BHAT, N. D. R., CHANDRA, P., KUDALE, S. and BHANDARI, S., 2015. Identifying the source of perytons at the Parkes radio telescope. Mon. Not. R. Astron. Soc. vol. 451, is. 4, pp. 3933–3940. DOI:

9. ZAKHARENKO, V. V., VASYLIEVA, I. Y., KONOVALENKO, A. A., ULYANOV, O. M., SERYLAK, M., ZARKA, P., GRIESSMEIER, J.-M., COGNARD, I. and NIKOLAENKO, V. S., 2013. Detection of decametre-wavelength pulsed radio emission of 40 known pulsars. Mon. Not. R. Astron. Soc. vol. 431, is. 4, pp. 3624–3641. DOI:

10. CORDES, J. M. and MCLAUGHLIN, M. A., 2003. Searches for fast radio transients. Astrophys. J. vol. 596, is. 2. P. 1142–1154. DOI:

11. MAAN YOGESH, 2015. Discovery of Low DM Fast Radio Transients: Geminga Pulsar Caught in the Act. Astrophys. J. vol. 815, is. 2, id. 126. DOI:

12. KEANE, E., BHATTACHARYYA, B., KRAMER, M., STAPPERS, B., W., BATES S. D., BURGAY, M., CHATTERJEE, S., CHAMPION, D. J., EATOUGH, R. P., HESSELS, J. W. T., JANSSEN, G., LEE, K. J., VAN LEEUWEN, J., MARGUERON, J., OERTEL, M., POSSENTI, A., RANSOM, S., THEUREAU, G. and TORNE, P., 2014. A Cosmic Census of Radio Pulsars with the SKA. In: Advancing Astrophysics with the Square Kilometre Array (AASKA14): Proc. Conf. Giardini Naxos, Italy, 9-13 June 2014, id. PoS(AASKA14)040.

13. MANCHESTER, R. N., HOBBS, G. B., TEOH, A. and HOBBS, M., 2005. The Australia Telescope National Facility Pulsar Catalogue. Astron. J. vol. 129, is. 4, pp. 1993–2006. DOI:

14. CORDES, J. M., 1978. Observational limits on the location of pulsar emission regions. Astrophys. J. Part 1. vol. 222, pp. 1006–1011. DOI:

15. KEANE, E. F. and KRAMER, M., 2008. On the birthrates of Galactic neutron stars. Mon. Not. R. Astron. Soc. vol. 391, is. 4, pp. 2009–2016. DOI:

16. MALOFEEV, V. M., MALOV, O. I. and TEPLYKH, D. A., 2007. Radio emission from AXP and XDINS. Astrophys. Space Sci. vol. 308, is. 1–4, pp. 211–216. DOI:



survey; single pulse; radio frequency interference; dispersion measure; scintillations; decameter wavelengths

Full Text:


Creative Commons License

Licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0) .