Solar large scale velocity structures from optical resonance method

Details Solar large scale velocity structures from optical resonance method Solar large scale velocity structures from optical resonance method

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137...43r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 1, Aug. 1984, p. 43-50.

Astronomy and Astrophysics

Astrophysics

7

Optical Resonance, Solar Oscillations, Doppler Effect, Line Spectra, Solar Atmosphere, Stellar Spectrophotometry, Velocity Distribution

Scientific paper

Preliminary observations have been made to search for large scale velocity fields by means of sodium optical resonance spectrophotometry. The authors recall that the standard method measures only 2 points of the line, in order to derive the Doppler shift. They point out an ambiguity from line profile distortion, because apparent upflows are seen in the wide area of active regions. In any case, this can explain the long-term modulation observed in full disk Doppler measurements (Claverie et al., 1982) without the need of invoking a rapidly rotating core. In the quiet solar atmosphere, an upper limit of 15 m s-1 rms for the large scale (≥50,000 km) velocity distribution is deduced. A relatively simple optimization of the optical resonance technique is suggested in order to progress in this field.

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