73 citations · 206 across the 8 of their papers we have counts for
8 papers
Doppler images of II Pegasi for 2004-2010
Thomas Hackman, Maarit J. Mantere, Marjaana Lindborg +4
Aims. We study the spot activity of II Peg during the years 2004-2010 to determine long- and short-term changes in the magnetic activity. In a previous study, we detected a persist…
Solar active regions: a nonparametric statistical analysis
J. Pelt, M. J. Korpi, I. Tuominen
The sunspots and other solar activity indicators tend to cluster on the surface of the Sun.These clusters very often occur at certain longitudes that persist in time.It is of gener…
Zeeman-Doppler Imaging of II Peg - Magnetic field restructuring from 2004 to 2007
T. A. Carroll, M. Kopf, K. G. Strassmeier +2
We present Zeeman-Doppler images of the active K2 star II Peg for the years 2004 and 2007. The surface magnetic field was reconstructed with our new ZDI code "iMap" which provides…
Kinematic frames and "active longitudes": does the Sun have a face?
J. Pelt, J. M. Brooke, M. J. Korpi +1
It has recently been claimed that analysis of Greenwich sunspot data over 120 years reveals that sunspot activity clusters around two longitudes separated by 180 degrees (``active…
Century scale persistence in longitude distribution: in the Sun and in silico
J. Pelt, I. Tuominen, J. Brooke
Using Greenwich sunspot data for 120 years it was recently observed that activity regions on the Sun's surface tend to lie along smoothly changing longitude strips 180 degrees apar…
Local models of stellar convection: Reynolds stresses and turbulent heat transport
P. J. Käpylä, M. J. Korpi, I. Tuominen
We study stellar convection using a local three-dimensional MHD model, with which we investigate the influence of rotation and large-scale magnetic fields on the turbulent momentum…