33 citations · 110 across the 5 of their papers we have counts for
5 papers
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…
A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7V star HD54879
S. Hubrig, M. Kueker, S. P. Jarvinen +4
Only eleven O-type stars have been confirmed to possess large-scale organized magnetic fields. The presence of a -600G longitudinal magnetic field in the O9.7V star HD54879 with a…
Evolution of Magnetic Helicity and Energy Spectra of Solar Active Regions
Hongqi Zhang, Axel Brandenburg, D. D. Sokoloff
We adopt an isotropic representation of the Fourier-transformed two-point correlation tensor of the magnetic field to estimate the magnetic energy and helicity spectra as well as c…
Magnetic helicity and energy spectra of a solar active region
Hongqi Zhang, Axel Brandenburg, D. D. Sokoloff
We compute for the first time magnetic helicity and energy spectra of the solar active region NOAA 11158 during 11-15 February 2011 at 20^o southern heliographic latitude using obs…
The fluctuating α-effect and Waldmeier relations in the nonlinear dynamo models
V. V. Pipin, D. D. Sokoloff
We study the possibility to reproduce the statistical relations of the sunspot activity cycle, like the so-called Waldmeier relations, the cycle period - amplitude and the cycle ri…