Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Volkmar Holzwarth"'
Autor:
Manfred Schüssler, Volkmar Holzwarth
Publikováno v:
Astronomy & Astrophysics. 377:251-263
We apply the "solar paradigm" for stellar magnetic activity to the post-main-sequence evolution of stars in the mass range $1 {M_{\odot}} \le M_{\star} \le 3 {M_{\odot}}$. The model starts from a strong toroidal magnetic field generated by a dynamo w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b2e046f70a74d2c2ed8039857b5a794
https://doi.org/10.1051/0004-6361:20011097
https://doi.org/10.1051/0004-6361:20011097
Autor:
Volkmar Holzwarth, Manfred Schüssler
Publikováno v:
Astronomische Nachrichten. 321:175-179
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8ee43c8d7754528d3d1318dce8b2de18
https://doi.org/10.1002/1521-3994(200008)321:3<175::aid-asna175>3.0.co
https://doi.org/10.1002/1521-3994(200008)321:3<175::aid-asna175>3.0.co
Publikováno v:
Astronomische Nachrichten. 328:1108-1110
To explain the observed intermingling of polarities in the magnetic field distributions of rapidly rotating stars, surface magnetic flux transport models demand the presence of fast meridional flows.We combine simulations of the pre-eruptive and post
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6468ae5486a5ec78ed16833285b5eb3c
https://doi.org/10.1002/asna.200710854
https://doi.org/10.1002/asna.200710854
Autor:
Volkmar Holzwarth, Gudrun Laschewski
Publikováno v:
AIP Conference Proceedings.
The DWD provides forecasts of the UV Index as a public service to raise awareness for the negative influence of UV radiation on human health. Revising the current forecast algorithm, alternative descriptions for the aerosol effect are evaluated in or
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4e9795472144f5e57b605328f3024711
https://doi.org/10.1063/1.4804884
https://doi.org/10.1063/1.4804884
Autor:
G. A. J. Hussain, Manuel Güdel, Joel H. Kastner, Antonio Maggio, Evelyne Alecian, Jean-François Donati, Gregg A. Wade, Thierry Montmerle, G. G. Sacco, Costanza Argiroffi, Scott G. Gregory, F. Damiani, David P. Huenemoerder, Volkmar Holzwarth, Jerome Bouvier, Marc Audard, Silvia H. P. Alencar
Publikováno v:
EPJ Web of Conferences, Vol 64, p 08009 (2014)
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 part of a coordinated program involving near-simultaneous spectropolarim
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e327ec4e2f4f48be70b0115d90dc966f
Autor:
Volkmar Holzwarth, Manfred Schüssler
Publikováno v:
Astronomische Nachrichten. 323:399-401
Observations of spot distributions on active binaries indicate the existence of preferred longitudes, which are more pronounced if the system period is shorter. This suggests that this effect is caused by the proximity of the companion star. We explo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b49035085a344182a28db0db2641702
https://doi.org/10.1002/1521-3994(200208)323:3/4<399::aid-asna399>3.0.co
https://doi.org/10.1002/1521-3994(200208)323:3/4<399::aid-asna399>3.0.co
Autor:
Sascha Knell, Oliver Herzog, Udo Ziegenhagel, Nadejda Kirchner, Volkmar Holzwarth, Arno Klomfass, Martin Sauer
Publikováno v:
Proceedings of the 8th workshop on Parallel/High-Performance Object-Oriented Scientific Computing.
The Ernst-Mach-Institute (EMI) of the Fraunhofer-Society is dealing with a wide spectrum of subjects in the fields of applied physics, mechanical and civil engineering. The EMI department for numerical simulation supports the institute and external c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3d91772e59bee4f6348f86f7708f9dd
https://doi.org/10.1145/1595655.1595661
https://doi.org/10.1145/1595655.1595661
Autor:
Emre Işık, 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 region. The problem is to find the physical conditions in which magnetic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9da573546e9b83c34cd11441f9a8c297
Publikováno v:
Nature. 457(7226)
The magnetic fields of Earth and Jupiter, along with those of rapidly rotating, low-mass stars, are generated by convection-driven dynamos that may operate similarly (the slowly rotating Sun generates its field through a different dynamo mechanism).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca15e3572fecd93d1033b31d42ab03f2
https://pubmed.ncbi.nlm.nih.gov/19129839
https://pubmed.ncbi.nlm.nih.gov/19129839
Autor:
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 investigate the influence of the toroidal shape and equilibrium condition on the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b3f8f9e05811f75ab6302e4038015e6