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Démoulin, P.; Mandrini, C.H.; Van Driel-Gesztelyi, L.; Thompson, B.J.; Plunkett, S.; Kovári, Zs.; Aulanier, G.; Young, A. "What is the source of the magnetic helicity shed by CMEs? The long-term helicity budget of AR 7978" (2002) Astronomy and Astrophysics. 382(2):650-665
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Abstract:

An isolated active region (AR) was observed on the Sun during seven rotations, starting from its birth in July 1996 to its full dispersion in December 1996. We analyse the long-term budget of the AR relative magnetic helicity. Firstly, we calculate the helicity injected by differential rotation at the photospheric level using MDI/SoHO magnetograms. Secondly, we compute the coronal magnetic field and its helicity selecting the model which best fits the soft X-ray loops observed with SXT/Yohkoh. Finally, we identify all the coronal mass ejections (CMEs) that originated from the AR during its lifetime using LASCO and EIT/SoHO. Assuming a one to one correspondence between CMEs and magnetic clouds, we estimate the magnetic helicity which could be shed via CMEs. We find that differential rotation can neither provide the required magnetic helicity to the coronal field (at least a factor 2.5 to 4 larger), nor to the field ejected to the interplanetary space (a factor 4 to 20 larger), even in the case of this AR for which the total helicity injected by differential rotation is close to the maximum possible value. However, the total helicity ejected is equivalent to that of a twisted flux tube having the same magnetic flux as the studied AR and n number of turns in the interval [0.5, 2.0]. We suggest that the main source of helicity is the inherent twist of the magnetic flux tube forming the active region. This magnetic helicity is transferred to the corona either by the continuous emergence of the flux tube for several solar rotations (i.e. on a time scale much longer than the classical emergence phase), or by torsional Alfvén waves.

Registro:

Documento: Artículo
Título:What is the source of the magnetic helicity shed by CMEs? The long-term helicity budget of AR 7978
Autor:Démoulin, P.; Mandrini, C.H.; Van Driel-Gesztelyi, L.; Thompson, B.J.; Plunkett, S.; Kovári, Zs.; Aulanier, G.; Young, A.
Filiación:Observatoire de Paris, Section Meudon, URA 2080 (CNRS), 92195 Meudon Principal Cedex, France
Instituto de Astronomía y Física del Espacio, IAFE, CC. 67 Suc. 28, 1428 Buenos Aires, Argentina
Carrera del Investigador Científico, CONICET, Argentina
Mullard Space Science Laboratory, Univ. College London, United Kingdom
Konkoly Observatory, Hungary
Centre for Plasma Astrophysics, K.U. Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium
Goddard Space Flight Center - NASA, United States
USRA, Naval Research Laboratory, Washington, DC 20375, United States
Palabras clave:Solar-terrestrial relations; Sun: corona; Sun: coronal mass ejections (CMEs); Sun: magnetic fields; Magnetic field effects; Magnetic flux; Solar radiation; Sun; X rays; Coronal mass ejections (CME); Magnetic clouds; Magnetic helicity; Solar rotations; Astrophysics
Año:2002
Volumen:382
Número:2
Página de inicio:650
Página de fin:665
DOI: http://dx.doi.org/10.1051/0004-6361:20011634
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v382_n2_p650_Demoulin

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Citas:

---------- APA ----------
Démoulin, P., Mandrini, C.H., Van Driel-Gesztelyi, L., Thompson, B.J., Plunkett, S., Kovári, Zs., Aulanier, G.,..., Young, A. (2002) . What is the source of the magnetic helicity shed by CMEs? The long-term helicity budget of AR 7978. Astronomy and Astrophysics, 382(2), 650-665.
http://dx.doi.org/10.1051/0004-6361:20011634
---------- CHICAGO ----------
Démoulin, P., Mandrini, C.H., Van Driel-Gesztelyi, L., Thompson, B.J., Plunkett, S., Kovári, Zs., et al. "What is the source of the magnetic helicity shed by CMEs? The long-term helicity budget of AR 7978" . Astronomy and Astrophysics 382, no. 2 (2002) : 650-665.
http://dx.doi.org/10.1051/0004-6361:20011634
---------- MLA ----------
Démoulin, P., Mandrini, C.H., Van Driel-Gesztelyi, L., Thompson, B.J., Plunkett, S., Kovári, Zs., et al. "What is the source of the magnetic helicity shed by CMEs? The long-term helicity budget of AR 7978" . Astronomy and Astrophysics, vol. 382, no. 2, 2002, pp. 650-665.
http://dx.doi.org/10.1051/0004-6361:20011634
---------- VANCOUVER ----------
Démoulin, P., Mandrini, C.H., Van Driel-Gesztelyi, L., Thompson, B.J., Plunkett, S., Kovári, Zs., et al. What is the source of the magnetic helicity shed by CMEs? The long-term helicity budget of AR 7978. Astron. Astrophys. 2002;382(2):650-665.
http://dx.doi.org/10.1051/0004-6361:20011634