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Radio Physics and Radio Astronomy

ISSN Print: 2152-274X
ISSN Online: 2152-2758

Archives: Volume 1, 2010 to Volume 3, 2012

Radio Physics and Radio Astronomy

DOI: 10.1615/RadioPhysicsRadioAstronomy.v3.i3.10
pages 187-196

PECULIARITY OF CONTINUUM EMISSION FROM THE UPPER SOLAR CORONA AT DECAMETER WAVELENGTHS

A. I. Brazhenko
Poltava Gravimetric Observatory, Subbotin Institute of Geophysics National Academy of Sciences of Ukraine, 27/29 Myasoedov St., Poltava 36029, Ukraine
A. A. Koval
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
Alexandr A. Konovalenko
Institute of Radio Astronomy of the National Academy of Sciences of Ukraine
A. A. Stanislavsky
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
E. P. Abranin
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
V. V. Dorovsky
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
V. N. Melnik
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
R. V. Vashchishin
Poltava Gravimetric Observatory of the Institute of Geophysics, National Academy of Sciences of Ukraine, 27/29, Miasoedov St.,Poltava,36029
A. V. Frantsuzenko
Poltava Gravimetric Observatory of the Institute of Geophysics, National Academy of Sciences of Ukraine, 27/29, Miasoedov St.,Poltava,36029
O. V. Borysyuk
Poltava Gravimetric Observatory, Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, 27/29, Myasoedov St., Poltava, 36029, Ukraine

ABSTRACT

The results of the quiet Sun radio emission investigated at decameter wavelengths are presented. The observations have been made with the URAN-2 antenna array in summer seasons of 2008-2009 at 20 and 25 MHz within 250 kHz bandwidth together with the UTR-2 radio telescope in the summer-autumn period of 2010 at 16.5 to 33.0 MHz in the mode of one-dimensional heliograph. The average values of the quiet Sun corona flux density according to URAN-2 measurements are equal to 860 Jy at 25 MHz and 710 Jy at 20 MHz. The values of integral flux density from UTR-2 measurements for these frequencies are 950 and 800 Jy, respectively. The URAN-2 and UTR-2 measured data as respects the spectral index within 16.5−200 MHz have shown it to be the same and equal to −2.1 ± 0.1. The angular sizes of solar corona equatorial diameter have been determined from the UTR-2 observations. The results yielded are in good agreement with the values known for the continuum emission from the solar corona at higher frequencies. Simultaneous application of different geographically spaced radiotelescopes possessing coincident frequency range is shown effective, too.