Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Mantere, M. J."'
Autor:
Väisälä, M. S., Harju, J., Mantere, M. J., Miettinen, O., Sault, R. S., Walmsley, C. M., Whiteoak, J. B.
Publikováno v:
A&A 564, A99 (2014)
Cha-MMS1 was mapped in the NH_3(1,1) line and the 1.2 cm continuum using the Australia Telescope Compact Array, ATCA. The angular resolution of the ATCA observations is 7'' (~ 1000 AU), and the velocity resolution is 50 m s^{-1}. The core was also ma
Externí odkaz:
http://arxiv.org/abs/1311.7576
Publikováno v:
A&A 567, A139 (2014)
In astrophysics, turbulent diffusion is often used in place of microphysical diffusion to avoid resolving the small scales. However, we expect this approach to break down when time and length scales of the turbulence become comparable with other rele
Externí odkaz:
http://arxiv.org/abs/1310.3157
The dynamo processes in cool active stars generate complex magnetic fields responsible for prominent surface stellar activity and variability at different time scales. For a small number of cool stars magnetic field topologies were reconstructed from
Externí odkaz:
http://arxiv.org/abs/1301.1680
In this paper we first discuss observational evidence of longitudinal concentrations of magnetic activity in the Sun and rapidly rotating late-type stars with outer convective envelopes. Scenarios arising from the idea of rotationally influenced anis
Externí odkaz:
http://arxiv.org/abs/1211.2990
Publikováno v:
IAU Symposium v. 294 (2013) pp. 283-288
We present preliminary results from high resolution magneto-convection simulations where we find the formation of flux concentrations from an initially uniform magnetic field. We compute the effective magnetic pressure but find that the concentration
Externí odkaz:
http://arxiv.org/abs/1211.2962
Publikováno v:
Astrophys. J. 762, 127 (2013)
Using simulations of slowly rotating stratified turbulence, we show that the alpha effect responsible for the generation of astrophysical magnetic fields is proportional to the logarithmic gradient of kinetic energy density rather than that of moment
Externí odkaz:
http://arxiv.org/abs/1208.5004
Publikováno v:
MNRAS (March 1, 2013) 430 (1): L40-L44
The origin and structure of the magnetic fields in the interstellar medium of spiral galaxies is investigated with 3D, non-ideal, compressible MHD simulations, including stratification in the galactic gravity field, differential rotation and radiativ
Externí odkaz:
http://arxiv.org/abs/1206.6784
We simulate the multi-phase interstellar medium randomly heated and stirred by supernovae, with gravity, differential rotation and other parameters of the solar neighbourhood. Here we describe in detail both numerical and physical aspects of the mode
Externí odkaz:
http://arxiv.org/abs/1204.3567
Direct numerical simulations of isotropically forced homogeneous stationary turbulence with an imposed passive scalar concentration gradient are compared with an analytical closure model which provides evolution equations for the mean passive scalar
Externí odkaz:
http://arxiv.org/abs/1112.4777
Publikováno v:
Geophys. Astrophys. Fluid Dyn. 107, 244-257 (2013)
We present results from compressible Cartesian convection simulations with and without imposed shear. In the former case the dynamo is expected to be of $\alpha^2\varOmega$ type which is generally expected to be relevant for the Sun, whereas the latt
Externí odkaz:
http://arxiv.org/abs/1111.6894