Do active Regions Emerge in a Similar Regime?

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Do active Regions Emerge in a Similar Regime?

• Valentyna Abramenko
• Big Bear Solar Observatory
• California, USA
• avi_at_bbso.njit.edu

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Outlook

• How the majority of active regions emerges
• Peculiar emergence of an active region
• Compare rates of an ordinary and peculiar ARs
• Conclusion suggestion on the dynamo action

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How the majority of active regions emerge?

• Dynamo generates the magnetic field near the
  bottom of the convective zone
• The field emerges due to buoyancy (and???) during
  2-4 months
• Forming oriented active regions on the photosphere

PICTURE of Omega loop emergence
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Example ordinary emergence AR NOAA 9574
Mag-my fd
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Example peculiar emergence AR NOAA 0798
Magma fd
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Next rotation
Magma FD 808 so strelochkoi
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One more rotation
Magma /FD remains so strelochkoi
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Flux emergence rate Ordinary
AR vs Peculiar AR
1 - Picture of flux 9574 3 deriv of flux 9574
2- picture of of flux of 0798 4 - deriv of
flux 0798
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Electric currents rate Ordinary
AR vs Peculiar AR
1 - Picture of deriv flux 9574 2 deriv of
ediss 9574
3- picture of the deriv of flux of 0798 4 -
deriv of ediss 0798 (kr tochki)
Horizontal Electric Currents Abramenko, V.,
2008, arXiv0806.1547
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Magnetic power spectrum rateOrdinary
AR vs Peculiar
AR
1 - Picture of flux 9574 - tonenko 2 mu(PS)
9574
3- picture of flux of 0798 tonko 4 - mu(PS)
0798
Magnetic Power Spectrum Abramenko 2005 ApJ 629
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Conclusions suggestion of the dynamo in the
subphotospheric layers
Y. Fun 2001
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Conclusions-2 suggestion of the dynamo in the
subphotospheric layers
Cattaneo Emonet 2004 convection (left) in an
electrically conducting fluid is capable of
dynamo action and generates a highly intermittent
magnetic field (right).