C IV plasma flow near active region filaments

Details C IV plasma flow near active region filaments C IV plasma flow near active region filaments

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..126..135a&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 126, March 1990, p. 135-152.

Physics

5

Carbon, Plasma Spectra, Solar Activity, Spectroheliographs, Solar Maximum Mission, Solar Prominences, Solar Velocity, Ultraviolet Spectra

Scientific paper

Selected C IV V(0) lines located near the solar limb and oriented parallel to the radius vector from disk center are shown to be closely aligned with H-alpha dark filaments in active regions. The filaments are known to lie in the vicinity of magnetic neutral lines. The radial orientation of the V(0) lines minimizes uncertainties in image registration and their location near the limb ensures that the observed fluid motion has major components paralleling V(0). It follows that the filaments are located at sites of velocity shear, and by inference, of magnetic shear. For a case in which a given V(0) line is observed near both east and west limbs, the gradient of Doppler velocity across the V(0) line reverses sign from one limb to the other as is expected for horizontal steady flow. Thus, the velocity vectors remain fixed with respect to filament.

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