Power spectra of velocity fluctuations in plages

Details Power spectra of velocity fluctuations in plages Power spectra of velocity fluctuations in plages

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974soph...39...79t&link_type=abstract

Solar Physics, vol. 39, Nov. 1974, p. 79-90.

Physics

7

Faculae, Photosphere, Power Spectra, Solar Atmosphere, Spectroheliographs, Velocity Distribution, Astronomical Models, Data Reduction, Digital Data, Gravity Waves

Scientific paper

Velocity spectroheliograms were used to study velocity and brightness fluctuations in and outside of active centers on the sun. The brightness-velocity correlation in plages is negative, suggesting the presence of downdrafts in the plages. It was observed that the 28 August 1973 plage velocities were damped differentially in the approximate log wavenumber range from -3.7 to -2.5. In the 10 August 1973 plage, no wavenumber appeared definitely damped except possibly at the shortest wavelengths. The results do not reproduce the predictions of one model which represents the photospheric oscillations as gravity waves (Chen and Lydoukis, 1972), although gravity waves propagating in an inclined magnetic field are not ruled out.

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