Brad Hindman (JILA/University of Colorado)
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Brad Hindman (JILA/University of Colorado). Invited speakers (afternoon): David Alexander (Rice University) Chip Manchester (University of Michigan). Active Region Magnetic Fields: From the Photosphere to the Corona.

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Brad Hindman (JILA/University of Colorado)

Invited speakers (afternoon):

David Alexander (Rice University)

Chip Manchester (University of Michigan)


Active Region Magnetic Fields: From the Photosphere to the Corona

Masahito Kubo (HAO/NCAR): Magnetic flux budget of a decaying sunspot

G-band intensity

(photosphere)

Line-of-sight magnetogram

(photosphere)


inner area Corona

outer area

Positive

Negative

Sunspot (penumbra)

Moat region

Outside moat region

moat flow

moat flow

MMFs

Flux cancellation

MMFs

Flux cancellation


Brad Hindman (JILA/University of Colorado): Subsurface circulations established by active regions


Plage circulations established by active regions

Plage

Sunspot

Quiet

Quiet

Photosphere

Moat flows

(depth < 2 Mm)

Surface inflows

(depth < 7 Mm)

Deep outflows

(depth > 10 Mm)


David Alexander (Rice University): Inferences from observations of active region flux

FOLLOWING POLARITY (*) SHOWS MORE FLUCTUATION

HELICITY IS ASYMMETRIC

d: total helicity flux (x1042Mx2) over 5 days for the positive and negative polarities

c: helicity injection rate (x1040Mx2 per hr) the positive and the negative polarities


  • Is the corona, its topology and evolution consistent with the dynamics and evolution of the sub-surface expectations?

  • Can we infer gross properties of the near sub-surface region from surface observations? e.g. can the observations usefully inform the models?

  • Nature or nurture? Is solar activity (flares/CMEs etc.) a result of genetics (properties defined at birth) or environmental conditions (evolution of AR atmosphere, interaction with large scale corona, …)


Chip Manchester (University of Michigan): the dynamics and evolution of the sub-surface expectations?

Study of flux emergence: Photospheric shear flows that produce coronal eruptions


Shine session proposal: the dynamics and evolution of the sub-surface expectations?

Observations and modeling of the theoreticians active region,

subphotosphere to corona

New cycle active region case studies

Submit results for session


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