Photospheric Vertical Current Density and Overlying Atmospheric Activity in an Emerging Flux Region

Details Photospheric Vertical Current Density and Overlying Atmospheric Activity in an Emerging Flux Region Photospheric Vertical Current Density and Overlying Atmospheric Activity in an Emerging Flux Region

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.2004g&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #20.04; Bulletin of the American Astronomical Society, Vol. 34, p.673

Astronomy and Astrophysics

Astronomy

Scientific paper

Using high-resolution vector magnetograms obtained by the balloon-borne Flare Genesis Experiment (FGE), we construct maps of the vertical current density in the emerging flux region NOAA 8844. The vertical current density has been decomposed into components that are field-aligned and perpendicular to the magnetic field, thus allowing a straightforward identification of force-free areas, as well as of areas where the force-free approximation breaks down. Small-scale chromospheric activity, such as H α Ellerman bombs and Ultraviolet bright points in 1600 Åshow a remarkable correlation with areas of strong current density. Simultaneous data of overlying coronal loops, observed by TRACE in the Extreme Ultraviolet (171 Åand 195 Å), have been carefully co-aligned with the FGE photospheric maps. We find that the footpoints of the TRACE loops always coincide with strong vertical currents and enhancements of the current helicity density. We also investigate whether the force-free approximation is valid on the photosphere during various evolutionary stages of the active region.

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