Electric current density and related sigmoid in an active region

V. Joulin; B. Schmieder; G. Aulanier; V. Bommier

doi:10.1051/eas/1255020

Electric current density and related sigmoid in an active region

V. Joulin
, B. Schmieder
, G. Aulanier
, V. Bommier

Research output: Contribution to journal › Article › peer-review

Abstract

Using THEMIS vector magnetograms we measured vertical electric current density in the leading sunspot of NOAA 11127 active region during its disk passage. The current structures evolve versus time. MHD modelling allows us to explain the spiral pattern by torsion. We found observational visible counterparts in the SDO/AIA 335 A images. The field lines are visible as loops in the AIA images. When the torsion is increasing, a sigmoid is observed. In the present event observed on November 24th 2010, we find that reconnection is also necessary to explain their sigmoidal shape.

Original language	English
Pages (from-to)	143-145
Number of pages	3
Journal	EAS Publications Series
Volume	55
DOIs	https://doi.org/10.1051/eas/1255020
Publication status	Published - 1 Jan 2012
Externally published	Yes

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10.1051/eas/1255020

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title = "Electric current density and related sigmoid in an active region",

abstract = "Using THEMIS vector magnetograms we measured vertical electric current density in the leading sunspot of NOAA 11127 active region during its disk passage. The current structures evolve versus time. MHD modelling allows us to explain the spiral pattern by torsion. We found observational visible counterparts in the SDO/AIA 335 A images. The field lines are visible as loops in the AIA images. When the torsion is increasing, a sigmoid is observed. In the present event observed on November 24th 2010, we find that reconnection is also necessary to explain their sigmoidal shape.",

author = "V. Joulin and B. Schmieder and G. Aulanier and V. Bommier",

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T1 - Electric current density and related sigmoid in an active region

AU - Joulin, V.

AU - Schmieder, B.

AU - Aulanier, G.

AU - Bommier, V.

PY - 2012/1/1

Y1 - 2012/1/1

N2 - Using THEMIS vector magnetograms we measured vertical electric current density in the leading sunspot of NOAA 11127 active region during its disk passage. The current structures evolve versus time. MHD modelling allows us to explain the spiral pattern by torsion. We found observational visible counterparts in the SDO/AIA 335 A images. The field lines are visible as loops in the AIA images. When the torsion is increasing, a sigmoid is observed. In the present event observed on November 24th 2010, we find that reconnection is also necessary to explain their sigmoidal shape.

AB - Using THEMIS vector magnetograms we measured vertical electric current density in the leading sunspot of NOAA 11127 active region during its disk passage. The current structures evolve versus time. MHD modelling allows us to explain the spiral pattern by torsion. We found observational visible counterparts in the SDO/AIA 335 A images. The field lines are visible as loops in the AIA images. When the torsion is increasing, a sigmoid is observed. In the present event observed on November 24th 2010, we find that reconnection is also necessary to explain their sigmoidal shape.

U2 - 10.1051/eas/1255020

DO - 10.1051/eas/1255020

M3 - Article

AN - SCOPUS:85181848102

SN - 1633-4760

VL - 55

SP - 143

EP - 145

JO - EAS Publications Series

JF - EAS Publications Series

ER -

Electric current density and related sigmoid in an active region

Abstract

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