Active region dynamics: Recent helioseismology results

A. G. Kosovichev, T. L. Duvall

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


New methods of local helioseismology and uninterrupted time series of solar oscillation data from the Solar and Heliospheric Observatory (SOHO) have led to a major advance in our understanding of the structure and dynamics of active regions in the subsurface layers. The initial results show that large active regions are formed by repeated magnetic flux emergence from the deep interior, and that their roots are at least 50 Mm deep. The active regions change the temperature structure and flow dynamics of the upper convection zone, forming large circulation cells of converging flows. The helioseismic observations also indicate that the processes of magnetic energy release, flares and coronal mass ejections, might be associated with strong (1-2 km/s) shearing flows, 4-6 Mm below the surface.

Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalSpace Science Reviews
Issue number1-4
StatePublished - Jun 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Sun: activity
  • Sun: heliseismology
  • Sun: interior
  • Sun: magnetic field
  • Sunspots


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