The smallest source region of an interplanetary magnetic cloud: A mini-sigmoid

We provide evidence for the smallest sigmoid eruption - CME - interplanetary magnetic cloud event ever observed by combining multi-wavelength remote sensing and in situ observations, as well as computing the coronal and interplanetary magnetic fields. The tiny bipole had 100 times less flux than an...

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Autores principales:	Mandrini, C.H., Pohjolainen, S., Dasso, S., Green, L.M., Démoulin, P., Van Driel-Gesztelyi, L., Foley, C., Copperwheat, C.
Formato:	JOUR
Materias:	Bursts and related phenomena Flares Interplanetary space MHD and plasmas Solar physics Clouds Interplanetary spacecraft Magnetic flux Remote sensing Solar energy Space research
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_02731177_v36_n8_p1579_Mandrini
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_02731177_v36_n8_p1579_Mandrini
record_format	dspace
spelling	todo:paper_02731177_v36_n8_p1579_Mandrini2023-10-03T15:15:34Z The smallest source region of an interplanetary magnetic cloud: A mini-sigmoid Mandrini, C.H. Pohjolainen, S. Dasso, S. Green, L.M. Démoulin, P. Van Driel-Gesztelyi, L. Foley, C. Copperwheat, C. Bursts and related phenomena Flares Interplanetary space MHD and plasmas Solar physics Clouds Interplanetary spacecraft Magnetic flux Remote sensing Solar energy Bursts and related phenomena Flares Interplanetary space MHD and plasmas Solar physics Space research We provide evidence for the smallest sigmoid eruption - CME - interplanetary magnetic cloud event ever observed by combining multi-wavelength remote sensing and in situ observations, as well as computing the coronal and interplanetary magnetic fields. The tiny bipole had 100 times less flux than an average active region (AR). It had a sigmoidal structure in the corona and we detected a very high level of twist in its magnetic field. On 11 May 1998, at about 8 UT, the sigmoid underwent eruption evidenced by expanding elongated EUV loops, dimmings and formation of a cusp. The Wind spacecraft, 4.5 days later, detected one of the smallest magnetic clouds (MC) ever identified (100 times less magnetic flux than an average MC). The link between the EUV bright point eruption and the interplanetary MC is supported by several pieces of evidence: timing, same coronal loop and MC orientation relative to the ecliptic, same magnetic field direction and magnetic helicity sign in the coronal loops and in the MC, comparable magnetic flux measured in the dimming regions and in the interplanetary MC and, most importantly, the pre- to post-event change of magnetic helicity in the solar corona is found to be comparable to the helicity content of the cloud. © 2005 COSPAR. Published by Elsevier Ltd. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02731177_v36_n8_p1579_Mandrini
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Bursts and related phenomena Flares Interplanetary space MHD and plasmas Solar physics Clouds Interplanetary spacecraft Magnetic flux Remote sensing Solar energy Bursts and related phenomena Flares Interplanetary space MHD and plasmas Solar physics Space research
spellingShingle	Bursts and related phenomena Flares Interplanetary space MHD and plasmas Solar physics Clouds Interplanetary spacecraft Magnetic flux Remote sensing Solar energy Bursts and related phenomena Flares Interplanetary space MHD and plasmas Solar physics Space research Mandrini, C.H. Pohjolainen, S. Dasso, S. Green, L.M. Démoulin, P. Van Driel-Gesztelyi, L. Foley, C. Copperwheat, C. The smallest source region of an interplanetary magnetic cloud: A mini-sigmoid
topic_facet	Bursts and related phenomena Flares Interplanetary space MHD and plasmas Solar physics Clouds Interplanetary spacecraft Magnetic flux Remote sensing Solar energy Bursts and related phenomena Flares Interplanetary space MHD and plasmas Solar physics Space research
description	We provide evidence for the smallest sigmoid eruption - CME - interplanetary magnetic cloud event ever observed by combining multi-wavelength remote sensing and in situ observations, as well as computing the coronal and interplanetary magnetic fields. The tiny bipole had 100 times less flux than an average active region (AR). It had a sigmoidal structure in the corona and we detected a very high level of twist in its magnetic field. On 11 May 1998, at about 8 UT, the sigmoid underwent eruption evidenced by expanding elongated EUV loops, dimmings and formation of a cusp. The Wind spacecraft, 4.5 days later, detected one of the smallest magnetic clouds (MC) ever identified (100 times less magnetic flux than an average MC). The link between the EUV bright point eruption and the interplanetary MC is supported by several pieces of evidence: timing, same coronal loop and MC orientation relative to the ecliptic, same magnetic field direction and magnetic helicity sign in the coronal loops and in the MC, comparable magnetic flux measured in the dimming regions and in the interplanetary MC and, most importantly, the pre- to post-event change of magnetic helicity in the solar corona is found to be comparable to the helicity content of the cloud. © 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.
format	JOUR
author	Mandrini, C.H. Pohjolainen, S. Dasso, S. Green, L.M. Démoulin, P. Van Driel-Gesztelyi, L. Foley, C. Copperwheat, C.
author_facet	Mandrini, C.H. Pohjolainen, S. Dasso, S. Green, L.M. Démoulin, P. Van Driel-Gesztelyi, L. Foley, C. Copperwheat, C.
author_sort	Mandrini, C.H.
title	The smallest source region of an interplanetary magnetic cloud: A mini-sigmoid
title_short	The smallest source region of an interplanetary magnetic cloud: A mini-sigmoid
title_full	The smallest source region of an interplanetary magnetic cloud: A mini-sigmoid
title_fullStr	The smallest source region of an interplanetary magnetic cloud: A mini-sigmoid
title_full_unstemmed	The smallest source region of an interplanetary magnetic cloud: A mini-sigmoid
title_sort	smallest source region of an interplanetary magnetic cloud: a mini-sigmoid
url	http://hdl.handle.net/20.500.12110/paper_02731177_v36_n8_p1579_Mandrini
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The smallest source region of an interplanetary magnetic cloud: A mini-sigmoid

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