202 citations · 630 across the 12 of their papers we have counts for
12 papers
Magnetic flux in the Sun emerges unaffected by supergranular-scale surface flows
Prasad Mani, Chris S. Hanson, Siddarth Dhanpal +3
Magnetic flux emergence from the convection zone into the photosphere and beyond is a critical component of the behaviour of large-scale solar magnetism. Flux rarely emerges amid f…
Characterization of magneto-convection in sunspots -- The Gough & Tayler stability criterion in MURaM sunspot simulations
M. Schmassmann, M. Rempel, N. Bello González +2
We analyse a sunspot simulation in an effort to understand the origin of the convective instabilities giving rise to the penumbral and umbral distinct regimes. We applied the crite…
On the (in)stability of sunspots
Hanna Strecker, Wolfgang Schmidt, Rolf Schlichenmaier +1
The stability of sunspots is one of the long-standing unsolved puzzles in the field of solar magnetism. We study the effects that destabilise and stabilise the flux tube of a simul…
Superstrong photospheric magnetic fields in sunspot penumbrae
A. Siu-Tapia, A. Lagg, M. van Noort +2
Recently, there have been some reports of unusually strong photospheric magnetic fields (which can reach values of over 7 kG) inferred from Hinode SOT/SP sunspot observations withi…
Small-scale dynamo simulations: Magnetic field amplification in exploding granules and the role of deep and shallow recirculation
Matthias Rempel
We analyze recent high resolution photospheric small-scale dynamo simulations that were computed with the MURaM radiative MHD code. We focus the analysis on newly forming downflow…
Numerical simulations of sunspot decay: On the penumbra -- Evershed flow -- moat flow connection
M. Rempel
We present a series of high-resolution sunspot simulations that cover a time span of up to 100 hours. The simulation domain extends about 18 Mm in depth beneath the photosphere and…
Efficient small-scale dynamo in solar convection zone
H. Hotta, M. Rempel, T. Yokoyama
We investigate small-scale dynamo action in the solar convection zone through a series of high resolution MHD simulations in a local Cartesian domain with 1 (solar radius)…
Validating Time-Distance Helioseismology With Realistic Quiet Sun Simulations
K. DeGrave, J. Jackiewicz, M. Rempel
Linear time-distance helioseismic inversions are carried out for vector flow velocities using travel times measured from two realistic m…
High-resolution calculations of the solar global convection with the reduced speed of sound technique: I. The structure of the convection and the magnetic field without the rotation
H. Hotta, M. Rempel, T. Yokoyama
We carry out non-rotating high-resolution calculations of the solar global convection, which resolve convective scales of less than 10 Mm. To cope with the low Mach number conditio…
Numerical Calculation of Convection with Reduced Speed of Sound Technique
H. Hotta, M. Rempel, T. Yokoyama +2
Context. The anelastic approximation is often adopted in numerical calculation with low Mach number, such as stellar internal convection. This approximation requires frequent globa…
Penumbral structure and outflows in simulated sunspots
M. Rempel, M. Schüssler, R. H. Cameron +1
Sunspots are concentrations of magnetic field on the visible solar surface that strongly affect the convective energy transport in their interior and surroundings. The filamentary…
Observation and Modeling of the Solar-Cycle Variation of the Meridional Flow
L. Gizon, M. Rempel
We present independent observations of the solar-cycle variation of flows near the solar surface and at a depth of about 60 Mm, in the latitude range . We show that th…