Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..901r&link_type=abstract
Astrophysical Journal, Part 1, vol. 218, Dec. 15, 1977, p. 901-919.
Astronomy and Astrophysics
Astrophysics
60
Atmospheric Circulation, Flow Velocity, Oscillations, Solar Activity, Magnetohydrodynamic Flow, Modal Response, Power Spectra, Solar Atmosphere, Solar Instruments, Velocity Distribution
Scientific paper
Observations of the solar velocity field with a diode array attached to the echelle spectrograph of a vacuum tower telescope are described which resolve the solar five-minute oscillatory motion into distinct bands of power. Previous observations are discussed which show that the solar five-minute oscillations can be resolved into frequencies having the character of nonradial p-mode eigenfrequencies of the solar envelope. The present observations confirm the observed frequencies and sharpen the previous resolution of the five-minute oscillations into ridges on the (wavenumber, frequency) plane. A comparison with earlier calculations indicates that the theoretical frequencies are in good but not perfect agreement with those observed. It is concluded that the identification of the five-minute oscillations as nonradial p-mode oscillations in the solar envelope is established beyond doubt.
Rhodes Elmer J.
Simon George W.
Ulrich Richard K.
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