C IV Doppler shifts observed in active region filaments

Details C IV Doppler shifts observed in active region filaments C IV Doppler shifts observed in active region filaments

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986nascp2442..183k&link_type=abstract

In NASA. Goddard Space Flight Center Coronal and Prominence Plasmas p 183-190 (SEE N87-20871 13-92)

Physics

3

Doppler Effect, Line Spectra, Photosphere, Red Shift, Solar Magnetic Field, Solar Prominences, Field Strength, Magnetic Signatures, Solar Limb, Solar Maximum Mission, Solar Physics, Spectrum Analysis, Ultraviolet Spectra

Scientific paper

The Doppler shift properties of 21 active region filaments have been studied using C IV Dopplergram data. Most are associated with corridors of weak magnetic field that separate opposite polarity strong fields seen in photospheric magnetograms. A majority of the filaments are relatively blue shifted, although several lie very close to the dividing lines between relative blue and red shift. Only one filament in our sample is clearly red shifted. A new calibration procedure for Dopplergrams indicates that sizable zero point offsets are often required. The center-to-limb behavior of the resulting absolute Doppler shifts suggests that filament flows are usually quite small (<3 km/s). It is possible that they vanish.

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