Observation of solar oscillations for periods close to 160 mn.
Abstract
An attempt is made to prove that recently observed solar power spectrum oscillations with a period near 160 min are actually an artifact caused by 5 min pulsations interacting with the calibration signals used by other observers. The power spectrum calculated by means of a Fourier transformation of readings from observed 5 min observations is defined, noting that since the readings are only made during the day, diurnal variations result. The distribution of the observed 160 min spectrum is shown to match the Fourier transformed 5 min spectrum, which corresponds to the 160 min spectrum at low frequencies. Only the amplitudes observed are explainable by use of a 5 min, rather than a 160 min, period of oscillation, and further study to explain the discrepancy is recommended.
- Publication:
-
Academie des Sciences Paris Comptes Rendus Serie B Sciences Physiques
- Pub Date:
- December 1981
- Bibcode:
- 1981CRASB.293..949D
- Keywords:
-
- Diurnal Variations;
- Power Spectra;
- Solar Oscillations;
- Solar Spectra;
- Fourier Transformation;
- Solar Physics;
- Oscillations:Sun