Energy of Force-Free Magnetic Fields in Relation to Coronal Mass Ejections Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.


  • Main Title Energy of Force-Free Magnetic Fields in Relation to Coronal Mass Ejections


  • Author: Choe, G.S.
    Creator Type: Personal
  • Author: Cheng, C.Z.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy. Office of Science.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Science (SC) (United States)


  • Name: Princeton University. Plasma Physics Laboratory.
    Place of Publication: Princeton, New Jersey
    Additional Info: Princeton Plasma Physics Lab., NJ (United States)


  • Creation: 2002-05-09


  • English


  • Content Description: In typical observations of coronal mass ejections (CMEs), a magnetic structure of a helmet-shaped closed configuration bulges out and eventually opens up. However, a spontaneous transition between these field configurations has been regarded to be energetically impossible in force-free fields according to the Aly-Sturrock theorem. The theorem states that the maximum energy state of force-free fields with a given boundary normal field distribution is the open field. The theorem implicitly assumes the existence of the maximum energy state, which may not be taken for granted. In this study, we have constructed force-free fields containing tangential discontinuities in multiple flux systems. These force-free fields can be generated from a potential field by footpoint motions that do not conserve the boundary normal field distribution. Some of these force-free fields are found to have more magnetic energy than the corresponding open fields. The constructed force-free configurations are compared with observational features of CME-bearing active regions. Possible mechanisms of CMEs are also discussed.
  • Physical Description: 360 Kilobytes pages


  • STI Subject Categories: 70 Plasma Physics And Fusion Technology
  • Keyword: Distribution
  • Keyword: Force-Free Magnetic Fields
  • Keyword: Closed Configurations


  • Other Information: PBD: 9 May 2002


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report


  • Text


  • Report No.: PPPL-3692.pdf
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/798171
  • Office of Scientific & Technical Information Report Number: 798171
  • Archival Resource Key: ark:/67531/metadc743119


  • Display Note: INIS; OSTI as DE00798171