Where is the electric current driven in the Blandford-Znajek process?

Kenji Toma, Fumio Takahara

Research output: Contribution to journalArticlepeer-review


The Blandford-Znajek process, the steady electromagnetic energy extraction from a rotating black hole, is widely believed to work for driving relativistic jets, although it is still under debate where the electric current is driven. We address this issue analytically by investigating the time-dependent state in the Boyer-Lindquist and Kerr-Schild coordinate systems. This analysis suggests that a non-ideal magnetohydrodynamic region is required in the time-dependent state, while not in the steady state.

Original languageEnglish
Pages (from-to)19-22
Number of pages4
JournalProceedings of the International Astronomical Union
Issue numberS324
Publication statusPublished - 2016


  • black hole physics
  • galaxies: jets
  • gamma rays: bursts
  • MHD
  • plasmas


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