Quasi-Periodic Oscillations (QPOs) have been observed during three powerful magnetar flares, from SGR0526-66, SGR1806-20 and SGR1900+14. These QPOs have been commonly interpreted as being driven by the mechanical modes of the magnetar’s solid crust which are excited during the flare. Here we show that this interpretation is in sharp contradiction with the conventional magnetar model. Firstly, w...

One of the ways that the Sun interacts with the Earth is through the solar wind, which is an ionized multicomponent fluid that emanates from the Sun and travels radially outward at hundreds of kilometers per second. Solar-wind transients, such as Coronal Mass Ejections (CME’s), can be particularly important. In rare cases, CME’s have affected the lower atmosphere of the Earth, causing regional ...

We report the magnetic field dependence of the critical solidification rate for the stability of liquid-solid interfaces. For a certain temperature gradient, the critical solidification rate first increases, then decreases, and subsequently increases with increasing magnetic field. The effect of the magnetic field on the critical solidification rate is more pronounced at low than at high temper...

Abstract Magnetically driven hotspot variations (which are tied to atmospheric wind variations) in hot Jupiters studied using nonlinear numerical simulations of a shallow-water magnetohydrodynamic (SWMHD) system and linear analysis equatorial SWMHD waves. In hydrodynamic models, mid-to-high-latitude geostrophic circulations known cause net west-to-east thermal energy transfer, which drives offs...

We discuss features of coronal mass ejections (CMEs) that are specific to heliospheric observations at large elongation angles. Our analysis is focused on a series of two eruptions that occurred on 2007 January 24-25, which were tracked by the Heliospheric Imagers (HIs) onboard STEREO. Using a three-dimensional (3-D) magneto-hydrodynamic simulation of these ejections with the Space Weather Mode...

In this paper we further develop a model for the heating of coronal loops by Alfvén wave turbulence (AWT). The Alfvén waves are assumed to be launched from a collection of kilogauss flux tubes in the photosphere at the two ends of the loop. Using a three-dimensional magneto-hydrodynamic (MHD) model for an active-region loop, we investigate how the waves from neighboring flux tubes interact in t...

In this paper, conjugate heat transfer of magneto hydrodynamic mixed convection of nanofluid about a vertical slender hollow cylinder embedded in a porous medium with high porosity have been numerically studied. The Forchheimer’s modification of Darcy’s law was used in representing the nanofluid motion inside the porous media. The governing boundary layer equations were transformed to non-dimen...

Abstract We compare some predictions of Wagoner & Tandon (WT) with the results hydrodynamic and magnetohydrodynamic (MHD) simulations Reynolds Miller (RM). It appears that MHD were not run for long enough numerical damping was small to produce observed high-frequency QPOs (and g-mode seen in hydro simulations).

Objectives: The primary goal of this paper is to study the influence MHD and micropolar fluid on squeeze film lubrication between stepped porous parallel plates. Method: non-Newtonian Reynolds type equation derived by considering flow in matrix as described Darcy’s law, well microstructure additives magnetic effects associated with magnetization fluid. numerical solutions are presented graphica...