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Evolutionary Characteristics of Magnetic Helicity Injection through Active Regions

Evolutionary Characteristics of Magnetic Helicity Injection through Active Regions. Hyewon Jeong, Jongchul Chae Seoul National University. Purpose. How much helicity is supplied through active regions?

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Evolutionary Characteristics of Magnetic Helicity Injection through Active Regions

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  1. Evolutionary Characteristics of Magnetic Helicity Injection through Active Regions Hyewon Jeong, Jongchul Chae Seoul National University

  2. Purpose • How much helicity is supplied through active regions? • Does the helicity injection in an active region occurs intensively during a specific period or steadily through all of its lifetime?

  3. Magnetic Helicity • Magnetic helicity Sum of linking numbers over all pairs of closed field lines in a given volume • Relative magnetic helicity Magnetic helicity relative to the helicity of potential field with the same magnetic flux at the photospheric boundary

  4. Method (Chae’s method) • Helicity transfer equation • Apparent horizontal velocity of field line footpoint : ( LCT method) • Normal component of photospheric magnetic field : (line-of-sight magnetogram data) • Vector potential for : (Fourier Transform method)

  5. Data and application • line-of-sight magnetogram data (SoHO/MDI) • 96min cadence • calculation for about 5 days away from the limb • 6 active regions

  6. AR 10696 1st rotation 2nd rotation

  7. AR 10696

  8. AR 10365 1st rotation 2nd rotation

  9. AR 10365

  10. Summary

  11. Conclusion • Magnetic helicity is supplied intensively during the growth of active regions or during flux emergence. • The range of the amount of helicity injected : • The maximum helicity injection rate measured :

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