On Relations among the Calibrated Parameters of the Transition Region Spectral Line

Details On Relations among the Calibrated Parameters of the Transition Region Spectral Line On Relations among the Calibrated Parameters of the Transition Region Spectral Line

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547..311r&link_type=abstract

Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO a

Computer Science

Scientific paper

SUMER/SOHO measurements of the O VI 1031.93 Å emission 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 (m Å) and the Doppler shift (km/s). A detailed procedure is performed in order to determine the absolute wavelength calibration of the spectra and Doppler shifts using simultaneously observed chromospheric O I 1027.44 Å and 1028.15 Å emission lines (10 000K). 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 dependencies of the spectral parameters.

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