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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.v1.i1.20
pages 11-18

PROPERTIES OF FAST DRIFTING TYPE III BURSTS AT DECAMETER WAVELENGTHS

V. N. Melnik
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
H. O. Rucker
Institut für Weltraumforschung der Österreichischen Akademie der Wissenschaften, 6, Schmiedlstrasse, Graz, 8042, Austria
B. P. Rutkevych
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
A. I. Brazhenko
Poltava Gravimetric Observatory, Subbotin Institute of Geophysics National Academy of Sciences of Ukraine, 27/29 Myasoedov St., Poltava 36029, Ukraine
A. Lecacheux
Ovservatoire Paris-Meudon, Paris, CNRS UMR 8644, France
A. A. Stanislavsky
Institute of Radio Astronomy, National Academy of Sciences of Ukraine

ABSTRACT

First results are reported concerning fast drifting type III-like radio bursts observed at 10 to 30 MHz. More than 1000 cases have been analyzed of the bursts recorded in 2002 to 2004. The frequency drift rates shown by the "fast" variety were several times higher than those of "standard" decameter wavelength type III bursts, while durations were mostly 1 to 2 s. The "fast" bursts were observable, for the most part, on those days when the active region stayed close to the central solar meridian. The explanation suggested for the high rate of the frequency drift of decameter wavelength type III-like bursts takes into account both the group velocity of electromagnetic waves and the speed of radiating electrons.

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