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Do active Regions Emerge in a Similar Regime?

Do active Regions Emerge in a Similar Regime?. Valentyna Abramenko Big Bear Solar Observatory California, USA avi@bbso.njit.edu. Outlook. How the majority of active regions emerges Peculiar emergence of an active region

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Do active Regions Emerge in a Similar Regime?

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  1. Do active Regions Emerge in a Similar Regime? Valentyna Abramenko Big Bear Solar Observatory California, USA avi@bbso.njit.edu

  2. 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

  3. 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

  4. Example: ordinary emergence: AR NOAA 9574 Mag-my: fd

  5. Example: peculiar emergence: AR NOAA 0798 Magma fd

  6. Next rotation: Magma FD 808 so strelochkoi

  7. One more rotation: Magma /FD remains so strelochkoi

  8. 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

  9. 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, arXiv:0806.1547

  10. Magnetic power spectrum rate:Ordinary 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

  11. Conclusions: suggestion of the dynamo in the subphotospheric layers Y. Fun 2001:

  12. 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).

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