Observations of solar pulsations

Details Observations of solar pulsations Observations of solar pulsations

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.259...87s&link_type=abstract

Nature, vol. 259, Jan. 15, 1976, p. 87-89.

Physics

131

Magnetic Variations, Magnetometers, Solar Instruments, Solar Magnetic Field, Velocity Measurement, Error Analysis, Instrument Errors, Magnetic Measurement, Periodic Variations, Radial Velocity, Stellar Luminosity

Scientific paper

Observations of stable periodic pulsations in the sun's surface are reported which were made with a solar magnetograph modified to measure velocities at the surface with an accuracy of about 1 m/s. It is shown that the pulsations are small fluctuations with a period of approximately 2 hr 40 min and an amplitude of about 10 km. The possibility is analyzed that these fluctuations may be purely radial pulsations of the sun as a whole, but it is found that if they are purely radial fluctuations, then the sun's luminosity should be some 10,000 times less than it is observed to be. Two possible solutions to this dilemma are suggested: (1) that nuclear reactions (in particular, the proton-proton reaction) are not responsible for solar energy generation or (2) that the pulsations are a gravitational g mode of quadrupole oscillation. It is noted that the period of the g(11) mode is in perfect agreement with the observed pulsation period.

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