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Magnetic helicity conservation - PowerPoint PPT Presentation

Non-helical MHD at 1024 3

Non-helical MHD at 1024 3

Non-helical MHD at 1024 3. Haugen, Brandenburg, & Dobler (2003, ApJ). Inverse cascade of magnetic helicity. argument due to Frisch et al. (197 5 ). and. Initial components fully helical:. and. ? k is forced to the left. Magnetic helicity. Maxwell eqns. Vector potential.

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545 views • 54 slides
Coronal Mass Ejections - the exhaust of modern dynamos

Coronal Mass Ejections - the exhaust of modern dynamos

Coronal Mass Ejections - the exhaust of modern dynamos. Examples: systematic swirl (helicity) Measuring it quantitatively Connection with the dynamo Axel Brandenburg ( Nordita, Stockholm ). Examples of helical exhaust. Sigmoidal structures: North/South dependence. south.

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383 views • 27 slides
Coronal Mass Ejections - the exhaust of modern dynamos

Coronal Mass Ejections - the exhaust of modern dynamos

Coronal Mass Ejections - the exhaust of modern dynamos. Examples: systematic swirl (helicity) Measuring it quantitatively Connection with the dynamo Axel Brandenburg ( Nordita, Stockholm ). Examples of helical exhaust. Sigmoidal structures: North/South dependence. south.

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278 views • 27 slides
Magnetic activity along the main sequence

Magnetic activity along the main sequence

Magnetic activity along the main sequence. Axel Brandenburg ( Nordita, Copenhagen ). Solar butterfly diagram. Typical cycle patterns. HD 81809: an old sun? B-V=0.64 ? 0.80 P cyc =8yr, P rot =40d, logR HK =-4.91: inactive. The sun as a star B-V=0.66 P cyc =10yr, P rot =26d,

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315 views • 20 slides
Magnetic activity along the main sequence

Magnetic activity along the main sequence

Magnetic activity along the main sequence. Axel Brandenburg ( Nordita, Copenhagen ). Solar butterfly diagram. Typical cycle patterns. HD 81809: an old sun? B-V=0.64 ? 0.80 P cyc =8yr, P rot =40d, logR HK =-4.91: inactive. The sun as a star B-V=0.66 P cyc =10yr, P rot =26d,

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204 views • 20 slides

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