89 citations · 346 across the 14 of their papers we have counts for
14 papers
Cool Stars and Space Weather
A. A. Vidotto, M. Jardine, A. C. Cameron +8
Stellar flares, winds and coronal mass ejections form the space weather. They are signatures of the magnetic activity of cool stars and, since activity varies with age, mass and ro…
The magnetosphere of the close accreting PMS binary V4046 Sgr AB
S. G. Gregory, V. R. Holzwarth, J. -F. Donati +14
We present a preliminary 3D potential field extrapolation model of the joint magnetosphere of the close accreting PMS binary V4046 Sgr. The model is derived from magnetic maps obta…
The magnetosphere of the close accreting PMS binary V4046 Sgr
S. G. Gregory, V. R. Holzwarth, J. -F. Donati +14
V4046 Sagittarii AB is a close short-period classical T Tauri binary. It is a circularised and synchronised system accreting from a circumbinary disk. In 2009 it was observed as pa…
Flow instabilities of magnetic flux tubes IV. Flux storage in the solar overshoot region
Emre Isik, Volkmar Holzwarth
We consider the effects of material flows on the dynamics of toroidal magnetic flux tubes located close to the base of the solar convection zone, initially within the overshoot reg…
Flow instabilities of magnetic flux tubes -- III. Toroidal flux tubes
Volkmar Holzwarth
In addition to buoyancy- and magnetic tension-driven instabilities, magnetic flux rings are also susceptible to an instability induced by the hydrodynamic drag force. We investigat…
Magnetic flux emergence in fast rotating stars
V. Holzwarth
Fast rotating cool stars are characterised by high magnetic activity levels and frequently show dark spots up to polar latitudes. Their distinctive surface distributions of magneti…