Steady flows in the chromosphere and transition-zone above active regions as observed by OSO-8

Details Steady flows in the chromosphere and transition-zone above active regions as observed by OSO-8 Steady flows in the chromosphere and transition-zone above active regions as observed by OSO-8

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980soph...68..327l&link_type=abstract

Solar Physics, vol. 68, Dec. 1980, p. 327-337.

Physics

27

Chromosphere, Radial Flow, Solar Atmosphere, Solar Flares, Steady Flow, Flow Velocity, H Alpha Line, Oso-8, Solar Activity, Solar Limb, Solar Prominences, Solar Spectra, Sunspot Cycle

Scientific paper

Two years of data from the University of Colorado ultraviolet spectrometer aboard OSO-8 were searched for steady line-of-sight flows in the chromosphere and transition-zone above active regions. The most conspicuous pattern that emerges from this data set is that many sunspots show persistent blueshifts of transition-zone lines indicating velocities of about 20 km/s with respect to the surrounding plage areas. The data show much smaller shifts in ultraviolet emission lines arising from the chromosphere: the shifts are frequently to the blue, but sometimes redshifts do occur. Plage areas often show a redshift of the transition-zone lines relative to the surrounding quiet areas, and a strong gradient of the vertical component of the velocity is evident in many plages. One area of persistent blueshift was observed in the transition-zone above an active region filament. The energy requirement of these steady flows over sunspots is discussed.

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