Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..645t&link_type=abstract
8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
The UV spectral lines formed at transition region temperatures in the solar atmosphere, shows a prevailing redshifted emission. Using the Solar Ultraviolet Measurements of Emitted Radiation spectrometer flown on the Solar and Heliospheric Observatory spacecraft, we measure the amount of line shift as a function of the temperature for several spectral lines formed in the range between 104 and 106 K. We analyze spectrograms relative to the quiet Sun and to the active region NOAA 7946. The velocities derived are increasing from a redshift of ~ 0 km/s at ~ 20000 K to 10 km/s at 1.9x105 K for the quiet Sun, and to ~ 15 km/s at 105 K for the active region. At higher temperature an opposite behaviour is observed. In the quiet Sun a blueshift of ~ -2 km/s is observed at the Ne viii formation temperature (6x105 K), while in the active region, a blue-shifted value around -8 km/s is observed for the same spectral line. By 106 K the blueshift is ~ -10 km/s in the active region as measured by Fe xii 1242.
Banerjee Dipti
Doyle Gerry J.
Erdély R.
Teriaca Luca
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