Publications (17)
Scaling and correlation analysis of galactic images
P. Frick, R. Beck, E. M. Berkhuijsen +1
Different scaling and autocorrelation characteristics and their application to astronomical images are discussed: the structure function, the autocorrelation function, Fourier spec…
Recognizing magnetic structures by present and future radio telescopes with Faraday rotation measure synthesis
R. Beck, P. Frick, R. Stepanov +1
We investigate whether the method of wavelet-based Faraday rotation measure (RM) Synthesis can help us to identify structures of regular and turbulent magnetic fields in extended m…
Transformation of solar wind energy and helicity spectra in the frame of magnetohydrodynamics shell modeling
I. Dukanov, E. Yushkov, P. Frick +1
Based on the data recorded during the Parker Solar Probe mission, it can be suggested that there is no balance between kinetic and magnetic energy in the vicinity of the Sun. The s…
Wavelet analysis of the long-term activity of V833 Tau
R. Stepanov, N. I. Bondar', M. M. Katsova +2
The bulk of available stellar activity observations is frequently checked for the manifestation of signs in comparison with the known characteristic of solar magnetic modulation. T…
Analysis of spiral arms using anisotropic wavelets: gas, dust and magnetic fields in M51
I. Patrikeev, A. Fletcher, R. Stepanov +4
We have developed a technique of isolating elongated structures in galactic images, such as spiral arms, using anisotropic wavelets and apply this to maps of the CO, infrared and r…
Wavelet tomography of the Galactic magnetic field. I. The method
R. Stepanov, P. Frick, A. Shukurov +1
We suggest a two-dimensional wavelet devised to deduce the large-scale structure of a physical field (e.g., the Galactic magnetic field) from its integrals along straight paths fro…
Multi-scale Radio-IR Correlations in M31 and M33: The Role of Magnetic Fields and Star Formation
F. S. Tabatabaei, E. M. Berkhuijsen, P. Frick +2
Interstellar magnetic fields and the propagation of cosmic ray electrons have an important impact on the radio-infrared (IR) correlation in galaxies. This becomes evident when stud…
Testing the magnetic field models of galaxies with the SKA
T. G. Arshakian, R. Stepanov, R. Beck +2
The future new-generation radio telescope SKA (Square Kilometre Array) and its precursors will provide a rapidly growing number of polarized radio sources. Hundred and thousands po…
Exploring the magnetic fields in local and distant galaxies
T. G. Arshakian, R. Stepanov, R. Beck +3
(abridged) We investigate the possibility to recognize the magnetic field structures in nearby galaxies and to test the cosmological evolution of their large- and small-scale magne…
Magnetic and gaseous spiral arms in M83
P. Frick, R. Stepanov, R. Beck +4
Isotropic and anisotropic wavelet transforms are used to decompose the images of the spiral galaxy M83 in various tracers to quantify structures in a range of scales from 0.2 to 10…
Long-time behavior of MHD shell models
P. Frick, G. Boffetta, P. Giuliani +2
The long time behavior of velocity-magnetic field alignment is numerically investigated in the framework of MHD shell model. In the stationary forced case, the correlation paramete…
Wavelet differentiation of a noisy signal
I. Patrickeyev, R. Stepanov, P. Frick
Several differentiating algorithms of the noisy signals are considered. The proposed wavelet based technique is compared with others based on the Fourier transform and the finite d…
Faraday Rotation Measure Synthesis for Magnetic Fields of Galaxies
P. Frick, D. Sokoloff, R. Stepanov +1
RM Synthesis was recently developed as a new tool for the interpretation of polarized emission data in order to separate the contributions of different sources lying on the same li…
Structures in the RM sky
P. Frick, R. Stepanov, A. Shukurov +1
Coherent structures in the distribution of the Faraday rotation measure of extragalactic radio sources are isolated using wavelet transformation technique. Signatures of the magnet…
Wavelet-based Faraday Rotation Measure Synthesis
P. Frick, D. Sokoloff, R. Stepanov +1
Faraday Rotation Measure (RM) Synthesis, as a method for analyzing multi-channel observations of polarized radio emission to investigate galactic magnetic fields structures, requir…
Statistical Mechanics of Shell Models for 2D-Turbulence
E. Aurell, G. Boffetta, A. Crisanti +3
We study shell models that conserve the analogues of energy and enstrophy, hence designed to mimic fluid turbulence in 2D. The main result is that the observed state is well descri…
Spectral characteristic of mid-term quasi-periodicities in sunspots data
P. Frick, D. Sokoloff, R. Stepanov +2
Numerous analyses suggest the existence of various quasi-periodicities in solar activity. The power spectrum of solar activity recorded in sunspot data is dominated by the 11…