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HPCLab research group news

, rich_text en Evidence of turbulent dynamo action in the Sun /en/department-of-computer-science/evidence-of-turbulent-dynamo-action-in-the-sun Thu, 17 Nov 2022 05:51:31 +0000 Maarit Korpi-Lagg 860006 at /en Astroinformatics research group has determined magnetic helicity spectrum from the solar surface observations using the recently developed two-scale formalism. Research astroinformatics computer science ReSolve CoE (Astroinformatics research group) determined magnetic helicity spectrum Surface gravity oscillation mode shows remarkable solar cycle dependence /en/department-of-computer-science/surface-gravity-oscillation-mode-shows-remarkable-solar-cycle Wed, 16 Nov 2022 10:42:56 +0000 Maarit Korpi-Lagg 859091 at /en 12 years of satellite data was used to reveal an enigmatic behaviour of the surface-gravity wave energy contained in the most quiet regions on solar surface. Research astroinformatics computer science Figure 1. Butterfly diagram of f-mode energy variations, computed from collapsed ring diagrams. The temporal average has been subtracted from the data, and is shown as the black line in the right panel. Its error bars represent the time-averaged standard deviation of the fluctuations of the f-mode energy around the signal for every bin. LUMI-G pilot /en/department-of-computer-science/lumi-g-pilot Tue, 07 Jun 2022 06:19:40 +0000 Maarit Korpi-Lagg 646191 at /en VISSI-project was selected as LUMI-G pilot Research astroinformatics computer science Turbulence at high Reynolds number in solar-like conditions. Image credit: Jörn Warnecke, MPS Dust destruction in Supernova blast waves /en/department-of-computer-science/dust-destruction-in-supernova-blast-waves Thu, 07 Oct 2021 06:11:26 +0000 Frederick Gent 456496 at /en A supernova explosion blasts hot supersonic plasma, destroying more interstellar dust in its path than fits current theory or observations of dust abundances in early galaxies. Research astroinformatics Simulated supernova remnant gas density with turbulent shell How important is turbulence in the solar dynamo? /en/department-of-computer-science/how-important-is-turbulence-in-the-solar-dynamo Fri, 03 Sep 2021 07:49:03 +0000 Maarit Korpi-Lagg 421051 at /en Aalto scientists show that all turbulent effects are decisive. Research astroinformatics computer science Comparison of the time-latitude (butterfly) diagrams of mean radial and azimuthal magnetic field from direct numerical simulation (top) and the Mean-field model (bottom) White lines: zero contours of mean azimuthal magnetic field from the MF model at the same time. Image copyright Jörn Warnecke, MPS. Small-Scale Dynamo in Supernova-Driven Interstellar Turbulence? /en/department-of-computer-science/small-scale-dynamo-in-supernova-driven-interstellar-turbulence Fri, 03 Sep 2021 07:32:26 +0000 Maarit Korpi-Lagg 421021 at /en Yes: simulations confirm small-scale dynamo action in the interstellar medium. Research astroinformatics computer science Figure 2a from Gent et al. Rotation-Activity relation in global convection simulations /en/department-of-computer-science/rotation-activity-relation-in-global-convection-simulations Wed, 02 May 2018 07:00:00 +0000 Matti Ahlgren 166276 at /en Stellar magnetic activity level and rotation are strongly connected. Astroinformatics research group studied the effect of increasing rotation rate on solar-like stars using magnetohydrodynamic simulations of stars with outer convective envelopes. Research astroinformatics Rotation-Activity relation in global convection simulations