Analysis of a relation between subphotospheric plasma flows and photospheric current kernels

A. Kulinová, E. Dzifčáková, A. G. Kosovichev, T. L. Duvall

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Very recently the subphotospheric plasma flows below the sunspots and active regions were revealed by the Time-Distance method of local helioseismology. In this poster we have studied positions of current kernels obtained from vector magnetograms together with maps of kinetic helicity and vorticity at several depths below the photosphere. Vector magnetograms obtained from Marshall Space Flight Center Solar Physics Group internet archive were used together with 3-D velocity fields obtained by Time-Distance method from SOHO/MDI data. The 3-D plasma flow velocities were provided by Dr. Kosovichev. We have found that maxima of vorticity are within an active region and are located at the depth of 3.0 Mm below the photosphere. Maxima of kinetic helicity are dominant within the active region in a depth range 1.8 - 4.5 Mm. The positions of vertical current kernels do agree with positions of observed flare kernels in UV continuum as it is widely believed. The maxima of kinetic helicity are not located directly below the vertical current kernels but they are still in their vicinity.

Original languageEnglish (US)
Title of host publicationProceedings of SOHO-17
Subtitle of host publication10 Years of SOHO and Beyond
Edition617
StatePublished - Jul 1 2006
Externally publishedYes
EventSOHO-17: 10 Years of SOHO and Beyond - Sicily, Italy
Duration: May 7 2006May 12 2006

Publication series

NameEuropean Space Agency, (Special Publication) ESA SP
Number617
ISSN (Print)0379-6566

Other

OtherSOHO-17: 10 Years of SOHO and Beyond
Country/TerritoryItaly
CitySicily
Period5/7/065/12/06

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science

Keywords

  • Active region
  • Flare
  • Plasma flow

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