Show simple item record Green, L. M. Démoulin, Pascal Mandrini, Cristina Hemilse van Driel Gesztelyi, Lidia 2017-07-24T18:37:21Z 2003-12
dc.identifier.citation Green, L. M.; Démoulin, Pascal; Mandrini, Cristina Hemilse; van Driel Gesztelyi, Lidia; How are emerging flux, flares and CMEs related to magnetic polarity imbalance in MDI data?; Springer; Solar Physics; 215; 2; 12-2003; 307-325
dc.identifier.issn 0038-0938
dc.description.abstract In order to understand whether major flares or coronal mass ejections (CMEs) can be related to changes in the longitudinal photospheric magnetic field, we study 4 young active regions during seven days of their disk passage. This time period precludes any biases which may be introduced in studies that look at the field evolution during the short-term flare or CME period only. Data from the Michelson Doppler Imager (MDI) with a time cadence of 96 min are used. Corrections are made to the data to account for area foreshortening and angle between line of sight and field direction, and also the underestimation of the flux densities. We make a systematic study of the evolution of the longitudinal magnetic field, and analyze flare and CME occurrence in the magnetic evolution. We find that the majority of CMEs and flares occur during or after new flux emergence. The flux in all four active regions is observed to have deviations from polarity balance both on the long term (solar rotation) and on the short term (few hours). The long-term imbalance is not due to linkage outside the active region; it is primarily related to the east–west distance from central meridian, with the sign of polarity closer to the limb dominating. The sequence of short-term imbalances are not closely linked to CMEs and flares and no permanent imbalance remains after them. We propose that both kinds of imbalance are due to the presence of a horizontal field component (parallel to the photospheric surface) in the emerging flux.
dc.format application/pdf
dc.language.iso eng
dc.publisher Springer
dc.rights info:eu-repo/semantics/restrictedAccess
dc.subject Flux
dc.subject.classification Astronomía
dc.subject.classification Ciencias Físicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title How are emerging flux, flares and CMEs related to magnetic polarity imbalance in MDI data?
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion 2017-07-24T14:12:33Z
dc.journal.volume 215
dc.journal.number 2
dc.journal.pagination 307-325
dc.journal.pais Alemania
dc.journal.ciudad Berlin
dc.description.fil Fil: Green, L. M.. Mullard Space Science Laboratory; Reino Unido. University College London; Estados Unidos
dc.description.fil Fil: Démoulin, Pascal. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
dc.description.fil Fil: Mandrini, Cristina Hemilse. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.description.fil Fil: van Driel Gesztelyi, Lidia. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia. University College London; Estados Unidos
dc.journal.title Solar Physics
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/

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