Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.80a&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
Doppler-shift properties of the solar transition region (TR) and low corona are investigated in relation to the underlying chromospheric supergranular network, with particular regard to the role of the magnetic field. EUV line properties were obtained from a large raster scan of the solar transition region and corona acquired by the UV/EUV spectrometer SUMER on board SOHO. The observed regions include an equatorial coronal hole, as well as surrounding quiet Sun areas. I present correlations between the chromospheric network, and the N IV (765.15 Å), O IV (790.19 Å), S V (786.50 Å), O V (760.45 Å) Doppler shifts in quiet Sun and coronal hole.
It is established that the maximum inflow (redshift) at transition region temperatures appears statistically toward the center of the network lanes in the quiet Sun areas and toward the boundary of the network lanes in the coronal hole part. Furthermore, while the strong red-shifts in the TR lines complement spatially blue-shifts from the low corona (Ne VIII, 770.41 Å) in a puzzle-like pattern, bi-directional flows (i.e. cospatial strong red/blue-shits in the TR/Corona) appear predominantly in the coronal hole. The bi-directional flows happen almost systematically at boundaries of magnetic field concentrations when compared to the reconstructed magnetogram from a MDI/SOHO series.
These results allow to propose for the first time a coherent interpretation involving a single driver for almost thirty years of unexplained statistical Doppler shift variations in the transition region and corona for quiet Sun and coronal hole. The proposed scenario involves reconnections between the strong network magnetic field and continuously advected weak field from the supergranular cell interior.
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