Horizontal velocities in the solar photosphere

Details Horizontal velocities in the solar photosphere Horizontal velocities in the solar photosphere

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...40...53d&link_type=abstract

Solar Physics, vol. 40, Jan. 1975, p. 53-63.

Physics

4

Doppler Effect, Flow Velocity, Line Spectra, Photosphere, Solar Atmosphere, Spectroheliographs, Atmospheric Models, Filtergrams, High Resolution, Radial Distribution, Solar Limb, Solar Spectra

Scientific paper

Horizontal macroscopic velocities in the photosphere are studied by analyzing the Doppler shifts of one spectral line in high-resolution spectrograms reaching the limb. Corrections were made for geometric foreshortening, and using calculated line formation rates and known height variation of vertical velocities, the height variation of the horizontal velocity field is obtained. Small-scale horizontal velocity field is then studied by following the proper motions of subarcsecond-size structures as seen on filtergrams obtained during very good seeing conditions. These filigree proper motions were found to imply an average velocity of about 1 km per sec.

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