Regularity in dynamic spectra of Jovian radio decameter S-bursts

¹ Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Chervonopraporna 4, 61002 Kharkiv, Ukraine e-mail: alexeyarkhipov@rambler.ru
² Department of Space Radio Physics, Kharkiv V. N. Karazin National University, Svoboda Square 4, 61077 Kharkiv , Ukraine
³ Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, Austria e-mail: rucker@oeaw.ac.at

Received: 12 July 2008
Accepted: 8 January 2009

Abstract

Short (S-) bursts of Jovian decametric emission show random behavior with very complicated forms in the dynamic spectrum. We first draw attention to the correlation properties of S-bursts as an indicator of their hidden regularity. Thus we calculate the linear correlation coefficient  between the spectral intensity in the current (f) and the reference (f_o) frequency channels with  time shift. The result is displayed in the form of 2D-correlation image, where the pixel brightness reflects the r estimate, and the pixel's co-ordinates are f and . The non-trivial and stabile correlation patterns are found, described, and discussed here. Apparently, there is the hidden wave-like modulation of the whole S-burst storm in the form of a correlation or anti-correlation between emissions at different radio frequencies with short time scales from 0.02 s to 0.8 s.