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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.

Registro:

Documento: Artículo
Título:How are emerging flux, flares and CMEs related to magnetic polarity imbalance in MDI data?
Autor:Green, L.M.; Démoulin, P.; Mandrini, C.H.; Van Driel-Gesztelyi, L.
Filiación:Mullard Space Science Laboratory, Univ. College London, United Kingdom
Observatoire de Paris, Section Meudon, LESIA (CNRS), F-92195 Meudon Principal Cedex, France
Inst. Astronomia/Fis. del Espacio, IAFE, CC. 67 Suc. 28, 1428 Buenos Aires, Argentina
Centre for Plasma Astrophysics, K.U. Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium
Konkoly Observatory, Hungary
Año:2003
Volumen:215
Número:2
Página de inicio:307
Página de fin:325
DOI: http://dx.doi.org/10.1023/A:1025678917086
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v215_n2_p307_Green

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Citas:

---------- APA ----------
Green, L.M., Démoulin, P., Mandrini, C.H. & Van Driel-Gesztelyi, L. (2003) . How are emerging flux, flares and CMEs related to magnetic polarity imbalance in MDI data?. Solar Physics, 215(2), 307-325.
http://dx.doi.org/10.1023/A:1025678917086
---------- CHICAGO ----------
Green, L.M., Démoulin, P., Mandrini, C.H., Van Driel-Gesztelyi, L. "How are emerging flux, flares and CMEs related to magnetic polarity imbalance in MDI data?" . Solar Physics 215, no. 2 (2003) : 307-325.
http://dx.doi.org/10.1023/A:1025678917086
---------- MLA ----------
Green, L.M., Démoulin, P., Mandrini, C.H., Van Driel-Gesztelyi, L. "How are emerging flux, flares and CMEs related to magnetic polarity imbalance in MDI data?" . Solar Physics, vol. 215, no. 2, 2003, pp. 307-325.
http://dx.doi.org/10.1023/A:1025678917086
---------- VANCOUVER ----------
Green, L.M., Démoulin, P., Mandrini, C.H., Van Driel-Gesztelyi, L. How are emerging flux, flares and CMEs related to magnetic polarity imbalance in MDI data?. Sol. Phys. 2003;215(2):307-325.
http://dx.doi.org/10.1023/A:1025678917086