On relations among the calibrated parameters of the transition region spectral line

J. Rybák1, A. Kucera1, W. Curdt2, H. Wöhl3

1Astronomical Institute of the Slovak Academy of Sciences, SK-05960 Tatranská Lomnica, Slovakia
2Max-Planck-Institut für Aeronomie, D-37189 Katlenburg-Lindau, Germany
3Kiepenheuer-Institut für Sonnenphysik, D-79104 Freiburg, Germany

Abstract:

SUMER/SOHO measurements of the emission O VI 1031.93 A spectral line (280000 K) in the network and internetwork of the transition region of the quiet solar atmosphere are used for a statistical analysis of the calibrated spectral parameters: the central line intensity (energetic units), the line width (mA) and the Doppler shift (km/s). A detail procedure is performed in order to determine the absolute wavelength calibration of the spectra and Doppler shifts using simultaneously observed chromospheric lines of O I. The spectral parameters of the O VI line are derived for both single and double Gaussian fitting of the line according to the latest findings on the multi-component nature of the transition region line profiles. Reliability of the absolute wavelength calibration and effects of two classes of the transition region transient events -- explosive events and blinkers -- are discussed in relation to the overall dependences of the spectral parameters.

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