Do active Regions Emerge in a Similar Regime? Valentyna Abramenko Valentyna Abramenko Big Bear Solar Observatory Big Bear Solar Observatory California,

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Presentation transcript:

Do active Regions Emerge in a Similar Regime? Valentyna Abramenko Valentyna Abramenko Big Bear Solar Observatory Big Bear Solar Observatory California, USA California, USA

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

How the majority of active regions emerge? Dynamo generates the magnetic field near the bottom of the convective zone Dynamo generates the magnetic field near the bottom of the convective zone The field emerges due to buoyancy (and???) during 2-4 months The field emerges due to buoyancy (and???) during 2-4 months Forming oriented active regions on the photosphere Forming oriented active regions on the photosphere PICTURE of Omega –loop emergence

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

Example: peculiar emergence: AR NOAA 0798 Magma fd

Next rotation: Magma FD 808 so strelochkoi

One more rotation: Magma /FD remains so strelochkoi

Flux emergence rate: Ordinary AR vs Peculiar AR Flux emergence rate: Ordinary AR vs Peculiar AR 1 - Picture of flux – deriv of flux picture of of flux of deriv of flux 0798

Electric currents rate: Ordinary AR vs Peculiar AR Electric currents rate: Ordinary AR vs Peculiar AR 1 - Picture of deriv flux – deriv of ediss picture of the deriv of flux of deriv of ediss 0798 (kr tochki) Horizontal Electric Currents: Abramenko, V., 2008, arXiv:

Magnetic power spectrum rate: Ordinary AR vs Peculiar AR Magnetic power spectrum rate: Ordinary AR vs Peculiar AR 1 - Picture of flux tonenko 2 – mu(PS) picture of flux of 0798 tonko 4 - mu(PS) 0798 Magnetic Power Spectrum: Abramenko 2005 ApJ 629

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

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).