Future University Hakodate Academic Archive

斉藤, 友貴哉

5580

和田, 雅昭

00404806

Future University Hakodate Repository

組込みシステムにおける3次元海洋情報の表示手法に関する研究

大羽, 隆介

5667

Android端末による船舶衝突防止システムの開発

上野, 嘉夫

80201953

Hino, H.

5674

Ishiwatari, Y.

5675

Certain Integrable System on a Space Associated with a Quantum Search Algorithm

Chekanov, N. A.

5677

Gusev, A. A.

5678

Rostovtsev, V. A.

5679

Vinitsky, S. I.

5680

Yu.A, Ukolov

5681

A REDUCE program for the normalization of polynomial Hamiltonians

5718

5719

Certain Integrable System on a Space Associated with a Quantum Search Algorithms

奥, 佑子

5742

Josephson接合キュビット系のBirkhoff-Gustavson標準化と分岐問題

V.B. , Ryabov

10325904

0000-0002-9243-7597

English

Using Lyapunov Exponents to Predict the Onset of Chaos in Nonlinear Oscillators

Usik, P. V.

5778

Vavriv, D. M.

5779

Chaotic masking without synchronization

Ryabov, B. P.

5780

Zarka, P.

5781

Rucker, H. O.

5782

Boudjada, M. Y.

5783

Jovian Decametric Emission: Regular Variabilities and Scale Invariants in S-Bursts Dynamic Spectra

EPSC Abstracts EPSC2007-A-00049European Planetary Science Congres

5845

5846

5847

Kozhin, R.

5848

Vinogradov, V.V.

5849

Shevchenko, V. A.

5850

EPSC Abstracts,
Vol. 2, EPSC2007-A-00049, 2007
European Planetary Science Congress 2007
© Author(s) 2007
Quantifying the coherence of Jupiter S-bursts
V.B. Ryabov (1,2), B.P. Ryabov (2), D.M. Vavriv (2), P. Zarka (3), R. Kozhin (2),
V.V. Vinogradov (2) and V.A. Shevchenko (2)
(1) Future University-Hakodate, Hakodate, Japan (riabov@fun.ac.jp / Fax: +81 138-346301 /
Phone: +81 138-346129), (2) Institute of Radio Astronomy, Kharkov, Ukraine, (3) Laboratoire
d’Etudes Spatiales et d’Instrumentation en Astrophysique (LESIA), Paris Observatory,
Meudon, France
We present the results of recent observations of Jupiter S-burst decametric emission
performed at the Ukrainian radio telescope UTR-2 equipped with a fast waveform
receiver working at sampling rate of∼66 MHz. The analysis is focused on coherent
properties of subpulses detected at microsecond time scale resolution. It is shown that
the observed coherence of S-bursts can be described either in terms of stationary seg-
ments of instantaneous phase, or narrow bandwidth of the instantaneous frequency of
S-burst patterns drifting across the dynamic spectra. An efficient algorithm based on
the concept of analytic signal is proposed for extracting phase information from the
recorded time series. It allowed automated identification of subpulses to be performed,
followed by a statistical analysis of coherence properties of quasi-harmonic segments
as well as tests for the presence of long-time correlations. The model of narrow band
random process is then shown to provide an adequate statistical description of both the
amplitude and phase variation in the observed waveforms. It is suggested that distri-
bution of instantaneous amplitude (i.e. oscillations envelope) gives an important clue
to underlying physical mechanism of S-burst generation. In particular, it is shown that
models of “generator”-type, i.e. a nonlinear system with feedback, are less suitable for
reproducing the statistical characteristics of S-bursts at microsecond level of temporal
resolution. On the other hand, the concept of a linear system that enhances fluctua-
tions within a narrow band, e.g., a cyclotron-maser-amplifier type model, fits well the
observational data.


Quantifying the coherence of Jupiter S-bursts(solicited)

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