Solar Doppler-shift measurements in the NE VII 465 A emission line

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Doppler Effect, Emission Spectra, Extreme Ultraviolet Radiation, Solar Spectra, Neon, Solar Activity, Solar Atmosphere, Solar Wind

Scientific paper

Using a Dopplergram obtained with the Naval Research Laboratory extreme ultraviolet spectrograph on Skylab, we have searched for Doppler shifts in the Ne VII 465 A emission line, which is formed at a temperature of about 500,000 K. In the quiet sun we find no measurable average Doppler shift to a measurement accuracy of +/- 18 km/s. Small regions of the quiet sun do, however, display measurable Doppler shifts. In active regions, we measure Doppler shifts indicating downflow velocities of up to 70 km/s.

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