Modelling and observations of photospheric magnetic helicity |
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| Authors: | P. Dé moulin,E. Pariat |
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| Affiliation: | 1. Observatoire de Paris, Meudon, LESIA, UMR 8109 (CNRS), F-92195 Meudon Cedex, France;2. NASA Goddard Space Flight Center, Greenbelt, MD, USA;3. College of Science, George Mason University, Fairfax, VA, USA;4. Naval Research Laboratory, Washington, DC, USA |
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| Abstract: | Mounting observational evidence of the emergence of twisted magnetic flux tubes through the photosphere have now been published. Such flux tubes, formed by the solar dynamo and transported through the convection zone, eventually reach the solar atmosphere. Their accumulation in the solar corona leads to flares and coronal mass ejections. Since reconnections occur during the evolution of the flux tubes, the concepts of twist and magnetic stress become inappropriate. Magnetic helicity, as a well preserved quantity, in particular in plasma with high magnetic Reynolds number, is a more suitable physical quantity to use, even if reconnection is involved. |
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| Keywords: | Magnetic fields Magnetic helicity Magneto-hydrodynamic Photosphere Corona Coronal mass ejections |
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