ob/data.html 1. Emerging Flux Simulations & proto Active Regions Bob Stein – Michigan State U. A.Lagerfjärd – Copenhagen U.

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Presentation transcript:

ob/data.html 1

Emerging Flux Simulations & proto Active Regions Bob Stein – Michigan State U. A.Lagerfjärd – Copenhagen U. Å. Nordlund – Niels Bohr Inst. D. Georgobiani – Michigan State U. 2

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 3

Emerging Magnetic Flux Ι B Ι & Velocity 4

Flux Emergence Mm 30 o to x-axis, 15 – 32 hr s Average fluid rise time = 32 hrs (interval between frames =1 min) 96 km horizontal resolution -> 48 km BvBv BhBh 5

6

7 t=25.44 hrs Top B vectors B (kG) Bottom V vectors lg B (kG )

8 t=24.89 hrs Top B vectors B (kG) Bottom V vectors lg B (kG

9 t=23.53 hrs Top B vectors B (kG) Bottom V vectors lg B (kG

10 t=21.72 hrs Top B vectors B (kG) Bottom V vectors lg B (kG

11 t=20.78 hrs Top B vectors B (kG) Bottom V vectors lg B (kG

12 t=20.19 hrs Top B vectors B (kG) Bottom V vectors lg B (kG

13 t=19.11hrs B vectors B (kG)

14 t=12.64 hrs B vectors B (kG)

15 SPOTS Intensity + B vertical -2.5 blue, -2 green, 2 yellow, 2.5 red (kG)

Proto- Spot 1 Evolution 16 Flux increase has stopped, ~1x10 19 Mx in this spot

Proto Spot 2 17

Proto Spot 3 disappearing 18