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http://steinr.pa.msu.edu/~bob/data.html - PPT Presentation

1 Emerging Flux Simulations amp proto Active Regions Bob Stein Michigan State U Lagerfjärd Copenhagen U Å Nordlund Niels Bohr Inst D Georgobiani Michigan State U ID: 336348

hrs vectors amp bottom vectors hrs bottom amp top spot flux proto horizontal emerging magnetic data bob vertical michigan

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Slide1

http://steinr.pa.msu.edu/~bob/data.html

1Slide2

Emerging Flux Simulations& proto Active RegionsBob Stein – Michigan State U.Lagerfjärd

– Copenhagen U.

Å.

Nordlund – Niels Bohr Inst.D. Georgobiani – Michigan State U.

2Slide3

The Simulation48 Mm wide x 20 Mm deep12-80 km vertical & 24 km horizontal resolutionAdvect minimally structured magnetic field -- horizontal, uniform, untwisted – by inflows at bottom

Gradually increase field strength to desired level with 5 hour

e

-folding timeObjectives:Investigate flux emergence, formation of pores & sunspots (withoutad hoc boundary conditions)Provide synthetic data for validating local helioseismology &vector magnetograph inversion procedures

Determine nature & origin of

supergranulation

3Slide4

Emerging Magnetic FluxΙBΙ & Velocity

4Slide5

Flux Emergence20 kG @ 20 Mm depth @ 30o to x-axis, 15 – 32 hr

s

Average fluid rise time = 32 hrs (interval between frames =1 min)

96 km horizontal resolution -> 48 kmBv

B

h

5Slide6

6Slide7

7

t

=25.44 hrs

TopB vectorsB (kG)

Bottom

V vectors

lg

B (

kG

)Slide8

8

t

=24.89 hrs

TopB vectorsB (kG)

Bottom

V vectors

lg

B (

kGSlide9

9

t

=23.53 hrs

TopB vectorsB (kG)

Bottom

V vectors

lg

B (

kGSlide10

10

t

=21.72 hrs

TopB vectorsB (kG)

Bottom

V vectors

lg

B (

kGSlide11

11

t

=20.78 hrs

TopB vectorsB (kG)

Bottom

V vectors

lg

B (

kGSlide12

12

t

=20.19 hrs

TopB vectorsB (kG)

Bottom

V vectors

lg

B (

kGSlide13

13t=19.11hrs

B vectors

B (

kG)Slide14

14t=12.64 hrs

B vectors

B (

kG)Slide15

15

SPOTS

Intensity

+

B

vertical

-2.5 blue

,

-2 green

,

2 yellow

,

2.5 red

(

kG

)Slide16

Proto-Spot 1 Evolution16

Flux increase has

stopped,

~1x1019 Mxin this spotSlide17

Proto Spot 217Slide18

Proto Spot 3disappearing18