Articles liés à Helicity of the Solar Magnetic Field: An application...

Helicity of the Solar Magnetic Field: An application to predicting the severity of solar flares - Couverture souple

Tiwari, Sanjiv Kumar

 
9783838397719: Helicity of the Solar Magnetic Field: An application to predicting the severity of solar flares
Couverture souple
ISBN 10 : 3838397711 ISBN 13 : 9783838397719
Editeur : LAP LAMBERT Academic Publishing, 2010

Synopsis

Magnetic helicity is a physical quantity that measures the complexity in the field lines. It is given by a volume integral over scalar product of magnetic field and its vector potential. Direct computation of magnetic helicity in the solar atmosphere is not possible in want of observations to compute the volume integral. We have clarified the physical meaning of ? and its relation with the magnetic helicity. An analytical bipole was generated to study the effect of polarimetric noise on the estimation of various magnetic parameters. We then examined the fine structures of sunspots in terms of local current and ?. The concept of signed shear angle (SSA) has been introduced. Spatially averaged SSA (SASSA) gives actual twist present in a sunspot at an observed height irrespective of force-free nature and shape of sunspots. We find that there is no net current in the sunspots even in the presence of significant twist which is consistent with fibril-bundle structure of sunspot magnetic fields. The SASSA holds promise to be very useful in predicting the severity of solar flares. A good correlation has been found among the signs of helicity at different heights in the solar atmosphere.

Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.

Présentation de l'éditeur

Magnetic helicity is a physical quantity that measures the complexity in the field lines. It is given by a volume integral over scalar product of magnetic field and its vector potential. Direct computation of magnetic helicity in the solar atmosphere is not possible in want of observations to compute the volume integral. We have clarified the physical meaning of ? and its relation with the magnetic helicity. An analytical bipole was generated to study the effect of polarimetric noise on the estimation of various magnetic parameters. We then examined the fine structures of sunspots in terms of local current and ?. The concept of signed shear angle (SSA) has been introduced. Spatially averaged SSA (SASSA) gives actual twist present in a sunspot at an observed height irrespective of force-free nature and shape of sunspots. We find that there is no net current in the sunspots even in the presence of significant twist which is consistent with fibril-bundle structure of sunspot magnetic fields. The SASSA holds promise to be very useful in predicting the severity of solar flares. A good correlation has been found among the signs of helicity at different heights in the solar atmosphere.

Biographie de l'auteur

The author has recently completed his Ph.D. thesis "Helicity of the Solar Magnetic Field" under the supervision of Professor P. Venkatakrishnan at Udaipur Solar Observatory/Physical Research Laboratory, India. His current research interests include sunspot fine structures, Solar-Terrestrial relations, sunspot equilibrium forces etc.

Les informations fournies dans la section « A propos du livre » peuvent faire référence à une autre édition de ce titre.

Éditeur
LAP LAMBERT Academic Publishing
Date d'édition
2010
Langue
anglais
ISBN 10 
3838397711
ISBN 13 
9783838397719
Reliure
Broché
Nombre de pages
212
Coordonnées du fabricant
non disponible
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