Artículo

Mandrini, C.H.; Pohjolainen, S.; Dasso, S.; Green, L.M.; Démoulin, P.; Van Driel-Gesztelyi, L.; Copperwheat, C.; Foley, C. "Interplanetary flux rope ejected from an X-ray bright point. The smallest magnetic cloud source-region ever observed" (2005) Astronomy and Astrophysics. 434(2):725-740
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Abstract:

Using multi-instrument and multi-wavelength observations (SOHO/MDI and BIT, TRACE and Yohkoh/SXT), as well as computing the coronal magnetic field of a tiny bipole combined with modelling of Wind in situ data, we provide evidences for the smallest event ever observed which links a sigmoid eruption to an interplanetary magnetic cloud (MC). The tiny bipole, which was observed very close to the solar disc centre, had a factor one hundred less flux than a classical active region (AR). In the corona it had a sigmoidal structure, observed mainly in EUV, and we found a very high level of non-potentiality in the modelled magnetic field, 10 times higher than we have ever found in any AR. From May 11, 1998, and until its disappearance, the sigmoid underwent three intense impulsive events. The largest of these events had extended EUV dimmings and a cusp. The Wind spacecraft detected 4.5 days later one of the smallest MC ever identified (about a factor one hundred times less magnetic flux in the axial component than that of an average MC). The link between this last eruption and the interplanetary magnetic cloud is supported by several pieces of evidence: good timing, same coronal loop and MC orientation, same magnetic field direction and magnetic helicity sign in the coronal loops and in the MC. We further quantify this link by estimating the magnetic flux (measured in the dimming regions and in the MC) and the magnetic helicity (pre- to post-event change in the solar corona and helicity content of the MC). Within the uncertainties, both magnetic fluxes and helicities are in reasonable agreement, which brings further evidences of their link. These observations show that the ejections of tiny magnetic flux ropes are indeed possible and put new constraints on CME models. © ESO 2005.

Registro:

Documento: Artículo
Título:Interplanetary flux rope ejected from an X-ray bright point. The smallest magnetic cloud source-region ever observed
Autor:Mandrini, C.H.; Pohjolainen, S.; Dasso, S.; Green, L.M.; Démoulin, P.; Van Driel-Gesztelyi, L.; Copperwheat, C.; Foley, C.
Filiación:Inst. de Astronomia y Fis. del E., CONICET-UBA, CC. 67, suc. 28, 1428 Buenos Aires, Argentina
Tuorla Observatory, VISPA, University of Turku, 21500 Piikkiö, Finland
Departamento de Física, Fac. de Ciencias Exactas y Naturales, UBA, Buenos Aires, Argentina
Faulkes Telescope Project, Cardiff University, 5 the Parade, Cardiff, CF24 3YB, United Kingdom
Observatoire de Paris, LESIA, UMR 8109 (CNRS), 92195 Meudon, France
Mullard Space Science Laboratory, University College London, Dorking, Surrey RH5 6NT, United Kingdom
Konkoly Observatory, Pf. 67, 1525 Budapest, Hungary
Palabras clave:Sun: corona; Sun: magnetic fields; Interplanetary spacecraft; Magnetic field effects; Magnetic flux; Magnetic moments; Planets; Statistical methods; Wind effects; X rays; Coronal mass ejections (CME); Sun: corona; Sun: magnetic fields; Wind spacecrafts; Astrophysics
Año:2005
Volumen:434
Número:2
Página de inicio:725
Página de fin:740
DOI: http://dx.doi.org/10.1051/0004-6361:20041079
Handle:http://hdl.handle.net/20.500.12110/paper_00046361_v434_n2_p725_Mandrini
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00046361_v434_n2_p725_Mandrini.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v434_n2_p725_Mandrini

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Citas:

---------- APA ----------
Mandrini, C.H., Pohjolainen, S., Dasso, S., Green, L.M., Démoulin, P., Van Driel-Gesztelyi, L., Copperwheat, C.,..., Foley, C. (2005) . Interplanetary flux rope ejected from an X-ray bright point. The smallest magnetic cloud source-region ever observed. Astronomy and Astrophysics, 434(2), 725-740.
http://dx.doi.org/10.1051/0004-6361:20041079
---------- CHICAGO ----------
Mandrini, C.H., Pohjolainen, S., Dasso, S., Green, L.M., Démoulin, P., Van Driel-Gesztelyi, L., et al. "Interplanetary flux rope ejected from an X-ray bright point. The smallest magnetic cloud source-region ever observed" . Astronomy and Astrophysics 434, no. 2 (2005) : 725-740.
http://dx.doi.org/10.1051/0004-6361:20041079
---------- MLA ----------
Mandrini, C.H., Pohjolainen, S., Dasso, S., Green, L.M., Démoulin, P., Van Driel-Gesztelyi, L., et al. "Interplanetary flux rope ejected from an X-ray bright point. The smallest magnetic cloud source-region ever observed" . Astronomy and Astrophysics, vol. 434, no. 2, 2005, pp. 725-740.
http://dx.doi.org/10.1051/0004-6361:20041079
---------- VANCOUVER ----------
Mandrini, C.H., Pohjolainen, S., Dasso, S., Green, L.M., Démoulin, P., Van Driel-Gesztelyi, L., et al. Interplanetary flux rope ejected from an X-ray bright point. The smallest magnetic cloud source-region ever observed. Astron. Astrophys. 2005;434(2):725-740.
http://dx.doi.org/10.1051/0004-6361:20041079