Helioseismic data from Emerging Flux & proto Active Region Simulations Bob Stein – Michigan State U. A.Lagerfjärd – Copenhagen U. Å. Nordlund – Niels Bohr.

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Presentation transcript:

Helioseismic data from Emerging Flux & proto Active Region Simulations Bob Stein – Michigan State U. A.Lagerfjärd – Copenhagen U. Å. Nordlund – Niels Bohr Inst. D. Georgobiani – Michigan State U. 1

2 a.html Data

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4 Main trunk: B bottom increasing 200G -> 10 kG, e-folding time 5 hours (mhd48-0) Branch: B bottom reached 1 kG at 11.5 hours, kept constant thereafter (mhd48-1) Branch: B bottom reached 5 kG at 19.6 hours, kept constant thereafter (mhd48-5) Branch: B bottom reached 10 kG at 23 hours, kept constant thereafter (mhd48-10) Links to each data set

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The Simulation 48 Mm wide x 20 Mm deep km vertical & 24 km horizontal resolution Advect minimally structured magnetic field -- horizontal, uniform, untwisted – by inflows at bottom Gradually increase field strength to desired level with 5 hour e-folding time Objectives: o Investigate flux emergence, formation of pores & sunspots (without ad hoc boundary conditions) o Provide synthetic data for validating local helioseismology &vector magnetograph inversion procedures o Determine nature & origin of supergranulation 7

Pore Formation Once B bottom reached 5 kG stopped increasing field strength. Magnetic flux from the edge of a large loop separated and formed a vertical flux concentration “flux tube” near the surface. The “flux tube” grows in strength as more magnetic field lines are swept into it and a pore forms. A time sequence is shown in the following slides 8

9 |B| & V hv scale |B|: kG Emergent Continuum Intensity & Vertical B (τ=0.1) scale I: [ 0.2,3] scale B v : [-4,3] kG |B| & B hv

10 |B| & V hv scale |B|: kG Emergent Continuum Intensity & Vertical B (τ=0.1) scale I: [ 0.2,3] scale B v : [-4,3] kG |B| & B hv

11 |B| & V hv scale |B|: kG Emergent Continuum Intensity & Vertical B (τ=0.1) scale I: [ 0.2,3] scale B v : [-4,3] kG |B| & B hv

12 |B| & V hv scale |B|: kG Emergent Continuum Intensity & Vertical B (τ=0.1) scale I: [ 0.2,3] scale B v : [-4,3] kG |B| & B hv

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Active Region Model Another simulation 20 kG field advected into domain at bottom Several pores form Then B artificially increased α B. Pores increase in area with only slight increase in B, since in pressure equilibrium with surroundings, B only increases as Wilson depression deepens. 14

15 Proto- SPOTS Intensity + B vertical -2.5 blue, -2 green, 2 yellow, 2.5 red (kG at τ=0.1)

Proto- Spot 1 16 Flux ~1x10 19 Mx in this proto-spot

Proto Spot 2 17

18 a.html Reminder –Data