Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Maarit J. Käpylä"'
Autor:
Simo Tuomisto, Jörn Warnecke, Matthias Rheinhardt, Maarit J. Käpylä, Frederick A. Gent, Mariangela Viviani
The role of turbulent effects for dynamos in the Sun and stars continues to be debated. Mean-field (MF) theory provides a broadly used framework to connect these effects to fundamental magnetohydrodynamics. While inaccessible observationally, turbule
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4822ff9007e57cc4f90611c334127578
https://aaltodoc.aalto.fi/handle/123456789/110767
https://aaltodoc.aalto.fi/handle/123456789/110767
Publikováno v:
Research Square
In this study we present a dynamical agent-based model to investigate the interplay between the socio-economy of and SEIRS-type epidemic spreading over a geographical area, divided to smaller area districts and further to smallest area cells. The mod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1c1d0678f9dcc9f00e73eb04dda992af
http://arxiv.org/abs/2105.06718
http://arxiv.org/abs/2105.06718
Autor:
Frederick A. Gent, James F. Hollins, Maarit J. Käpylä, Mordecai-Mark Mac Low, Graeme R. Sarson
Publikováno v:
Geophysical & Astrophysical Fluid Dynamics. 114:77-105
High Mach number shocks are ubiquitous in interstellar turbulence. The Pencil Code is particularly well suited to the study of magnetohydrodynamics in weakly compressible turbulence and the numerical investigation of dynamos because of its high-order
Publikováno v:
GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS. 113(1-2):149-183
We consider the effect of a subadiabatic layer at the base of the convection zone on convection itself and the associated large-scale dynamos in spherical wedge geometry. We use a heat conduction prescription based on the Kramers opacity law which al
Publikováno v:
The Astrophysical Journal Letters
Magnetic fields grow quickly even at early cosmological times, suggesting the action of a small-scale dynamo (SSD) in the interstellar medium of galaxies. Many studies have focused on idealized turbulent driving of the SSD. Here we simulate more real
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e046918c78d00fa353f75e9ec1282470
https://aaltodoc.aalto.fi/handle/123456789/106870
https://aaltodoc.aalto.fi/handle/123456789/106870
Autor:
Ruben Krasnopolsky, Matthias Rheinhardt, Hsien Shang, Johannes Pekkilä, Miikka S. Väisälä, Maarit J. Käpylä
Publikováno v:
The Astrophysical Journal
Magnetohydrodynamical (MHD) dynamos emerge in many different astrophysical situations where turbulence is present, but the interaction between large-scale (LSD) and small-scale dynamos (SSD) is not fully understood. We performed a systematic study of
Obtaining observational constraints on the role of turbulent effects for the solar dynamo is a difficult, yet crucial, task. Without such knowledge, the full picture of the operation mechanism of the solar dynamo cannot be formed. The magnetic helici
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::86a0d454dbef86567054cbd4e8bb26f2
Autor:
Maarit J. Käpylä, Jörn Warnecke
Publikováno v:
Astronomy & Astrophysics
For moderate and slow rotation, magnetic activity of solar-like stars is observed to strongly depend on rotation. These observations do not yet have a solid explanation in terms of dynamo theory. We aim to find such an explanation by numerically inve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b84a9d7e8b4a5e72681f6d09979ea45
https://aaltodoc.aalto.fi/handle/123456789/47429
https://aaltodoc.aalto.fi/handle/123456789/47429
Publikováno v:
Aalto University
Solar active regions (ARs) emerge on the Sun’s photosphere and they frequently produce flares and coronal mass ejections which are among major space weather drivers. Therefore, studying ARs can improve space weather forecast.The Mount Wilson Classi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::536da61a6506da7695fe99e328b12cce
https://doi.org/10.5194/egusphere-egu2020-18577
https://doi.org/10.5194/egusphere-egu2020-18577
Publikováno v:
The Astrophysical Journal
The magnetic activity of late-type stars is correlated with their rotation rates. Up to a certain limit, stars with smaller Rossby numbers, defined as the rotation period divided by the convective turnover time, have higher activity. A more detailed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af82d8adb052058c735330b932e305f3