Helicity loading and dissipation

The helicity budget of ar 7978 from the cradle to the grave

L. van Driel-Gesztelyi, P. Démoulin, C. H. Mandrini, S. Plunkett, B. Thompson, Z. Kővári, G. Aulanier, A. Young, M. López Fuentes, S. Poedts

Research output: Contribution to journalArticle

Abstract

Through a multi-wavelength and multi-instrument analysis we evaluate the magnetic helicity budget of an isolated active region (NOAA 7978) from its emergence throughout its decay. Using Yohkoh/ SXT images and linear force-free magnetic extrapolations carried out on SOHO/MDI magnetograms, we compute the relative magnetic helicity in the corona. Based on the observed magnetic field distribution we calculate the magnetic helicity injected by differential rotation. Then, using SOHO/LASCO & EIT and SXT images we identify all the 26 coronal mass ejections (CMEs) which originated from this active region during its lifetime and we estimate the amount of helicity which was shed via CMEs. Comparing these three values we find that the differential rotation can neither provide enough helicity to account for the diagnosed coronal helicity values, nor for the helicity carried away by CMEs. We suggest that the main source of the magnetic helicity must be the inherent twist of the magnetic flux tube forming the active region.

Original languageEnglish
Pages (from-to)143-146
Number of pages4
JournalCOSPAR Colloquia Series
Volume13
Issue numberC
DOIs
Publication statusPublished - 2002

Fingerprint

coronal mass ejection
budgets
dissipation
Magnetic flux
Extrapolation
magnetic signatures
Magnetic fields
Wavelength
coronas
corona
magnetic flux
extrapolation
tubes
magnetic field
wavelength
life (durability)
decay
estimates
magnetic fields
wavelengths

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science
  • Aerospace Engineering

Cite this

Driel-Gesztelyi, L. V., Démoulin, P., Mandrini, C. H., Plunkett, S., Thompson, B., Kővári, Z., ... Poedts, S. (2002). Helicity loading and dissipation: The helicity budget of ar 7978 from the cradle to the grave. COSPAR Colloquia Series, 13(C), 143-146. https://doi.org/10.1016/S0964-2749(02)80037-3

Helicity loading and dissipation : The helicity budget of ar 7978 from the cradle to the grave. / Driel-Gesztelyi, L. van; Démoulin, P.; Mandrini, C. H.; Plunkett, S.; Thompson, B.; Kővári, Z.; Aulanier, G.; Young, A.; López Fuentes, M.; Poedts, S.

In: COSPAR Colloquia Series, Vol. 13, No. C, 2002, p. 143-146.

Research output: Contribution to journalArticle

Driel-Gesztelyi, LV, Démoulin, P, Mandrini, CH, Plunkett, S, Thompson, B, Kővári, Z, Aulanier, G, Young, A, López Fuentes, M & Poedts, S 2002, 'Helicity loading and dissipation: The helicity budget of ar 7978 from the cradle to the grave', COSPAR Colloquia Series, vol. 13, no. C, pp. 143-146. https://doi.org/10.1016/S0964-2749(02)80037-3
Driel-Gesztelyi, L. van ; Démoulin, P. ; Mandrini, C. H. ; Plunkett, S. ; Thompson, B. ; Kővári, Z. ; Aulanier, G. ; Young, A. ; López Fuentes, M. ; Poedts, S. / Helicity loading and dissipation : The helicity budget of ar 7978 from the cradle to the grave. In: COSPAR Colloquia Series. 2002 ; Vol. 13, No. C. pp. 143-146.
@article{967ddb26383d4e9da99c038a7a164cf4,
title = "Helicity loading and dissipation: The helicity budget of ar 7978 from the cradle to the grave",
abstract = "Through a multi-wavelength and multi-instrument analysis we evaluate the magnetic helicity budget of an isolated active region (NOAA 7978) from its emergence throughout its decay. Using Yohkoh/ SXT images and linear force-free magnetic extrapolations carried out on SOHO/MDI magnetograms, we compute the relative magnetic helicity in the corona. Based on the observed magnetic field distribution we calculate the magnetic helicity injected by differential rotation. Then, using SOHO/LASCO & EIT and SXT images we identify all the 26 coronal mass ejections (CMEs) which originated from this active region during its lifetime and we estimate the amount of helicity which was shed via CMEs. Comparing these three values we find that the differential rotation can neither provide enough helicity to account for the diagnosed coronal helicity values, nor for the helicity carried away by CMEs. We suggest that the main source of the magnetic helicity must be the inherent twist of the magnetic flux tube forming the active region.",
author = "Driel-Gesztelyi, {L. van} and P. D{\'e}moulin and Mandrini, {C. H.} and S. Plunkett and B. Thompson and Z. Kőv{\'a}ri and G. Aulanier and A. Young and {L{\'o}pez Fuentes}, M. and S. Poedts",
year = "2002",
doi = "10.1016/S0964-2749(02)80037-3",
language = "English",
volume = "13",
pages = "143--146",
journal = "COSPAR Colloquia Series",
issn = "0964-2749",
publisher = "Elsevier Masson SAS",
number = "C",

}

TY - JOUR

T1 - Helicity loading and dissipation

T2 - The helicity budget of ar 7978 from the cradle to the grave

AU - Driel-Gesztelyi, L. van

AU - Démoulin, P.

AU - Mandrini, C. H.

AU - Plunkett, S.

AU - Thompson, B.

AU - Kővári, Z.

AU - Aulanier, G.

AU - Young, A.

AU - López Fuentes, M.

AU - Poedts, S.

PY - 2002

Y1 - 2002

N2 - Through a multi-wavelength and multi-instrument analysis we evaluate the magnetic helicity budget of an isolated active region (NOAA 7978) from its emergence throughout its decay. Using Yohkoh/ SXT images and linear force-free magnetic extrapolations carried out on SOHO/MDI magnetograms, we compute the relative magnetic helicity in the corona. Based on the observed magnetic field distribution we calculate the magnetic helicity injected by differential rotation. Then, using SOHO/LASCO & EIT and SXT images we identify all the 26 coronal mass ejections (CMEs) which originated from this active region during its lifetime and we estimate the amount of helicity which was shed via CMEs. Comparing these three values we find that the differential rotation can neither provide enough helicity to account for the diagnosed coronal helicity values, nor for the helicity carried away by CMEs. We suggest that the main source of the magnetic helicity must be the inherent twist of the magnetic flux tube forming the active region.

AB - Through a multi-wavelength and multi-instrument analysis we evaluate the magnetic helicity budget of an isolated active region (NOAA 7978) from its emergence throughout its decay. Using Yohkoh/ SXT images and linear force-free magnetic extrapolations carried out on SOHO/MDI magnetograms, we compute the relative magnetic helicity in the corona. Based on the observed magnetic field distribution we calculate the magnetic helicity injected by differential rotation. Then, using SOHO/LASCO & EIT and SXT images we identify all the 26 coronal mass ejections (CMEs) which originated from this active region during its lifetime and we estimate the amount of helicity which was shed via CMEs. Comparing these three values we find that the differential rotation can neither provide enough helicity to account for the diagnosed coronal helicity values, nor for the helicity carried away by CMEs. We suggest that the main source of the magnetic helicity must be the inherent twist of the magnetic flux tube forming the active region.

UR - http://www.scopus.com/inward/record.url?scp=77957064030&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77957064030&partnerID=8YFLogxK

U2 - 10.1016/S0964-2749(02)80037-3

DO - 10.1016/S0964-2749(02)80037-3

M3 - Article

VL - 13

SP - 143

EP - 146

JO - COSPAR Colloquia Series

JF - COSPAR Colloquia Series

SN - 0964-2749

IS - C

ER -