1k citations · 7.5k across the 83 of their papers we have counts for
6 papers · 2 filters
Evolution of the magnetic field in magnetars
J. Braithwaite, H. C. Spruit
We use numerical MHD to look at the stability of a possible poloidal field in neutron stars (Flowers & Ruderman 1977), and follow its unstable evolution, which leads to the complet…
A differential rotation driven dynamo in a stably stratified star
J. Braithwaite, H. C. Spruit
We present numerical simulations of a self-sustaining magnetic field in a differentially rotating non-convective stellar interior. A weak initial field is wound up by the different…
Fine structure, magnetic field and heating of sunspot penumbrae
H. C. Spruit, G. B. Scharmer
We interpret penumbral filaments as due to convection in field-free, radially aligned gaps just below the visible surface of the penumbra, intruding into a nearly potential field a…
Magnetic flux captured by an accretion disk
Dmitri A. Uzdensky, H. C. Spruit
We suggest a possible mechanism of efficient transport of the large-scale external magnetic flux inward through a turbulent accretion disk. The outward drift by turbulent diffusion…
A fossil origin for the magnetic fields of A-stars and white dwarfs
J. Braithwaite, H. C. Spruit
Some main-sequence stars of spectral type A are observed to have a strong (300-30000 G), static, large-scale magnetic field, of a chiefly dipolar shape -- the `Ap stars' (for examp…
Evaporation of ion-irradiated disks
C. P. Dullemond, H. C. Spruit
We calculate the evaporation of a cool accretion disk around a black hole due to the ion-bombardment by an ion supported accretion flow (here ISAF, or optically thin ADAF). As firs…