Preparation of a second station for the measurement of solar oscillations of low degree 'l'

• Published in: Il nuovo cimento della Società italiana di fisica. Sezione C, Geophysics and space physics Vol. 13 C; no. 1; pp. 163 - 168
• Main Authors: Cacciani, A., Fabbri, F., Ricci, D., Rosati, P., Marquedant, R., Smith, E.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Legacy CDMS Compositori 01-02-1990
• Subjects: Astronomy; Diameter, figure, rotation, mass; Earth, ocean, space; Exact sciences and technology; Solar Physics; Solar system; Helioseismology; Sun; Oscillation; Signal to noise ratio; Power spectrum
• ISSN: 0390-5551; 1826-9885
• DOI: 10.1007/BF02515786

An observing station to detect low-degree global solar oscillations is already operational at the Jet Propulsion Laboratory. A second station for continuative measurements of such oscillations has recently been installed and successfully tested in Rome. The high transmission and stability of the magneto-optical filter (MOF) coupled with the lock-in amplifier technique allow analog and real-time detection of oscillation modes with a noise level of only a few cm/s. Observing runs and estimates of the signal-to-noise ratio are shown in time and frequency domains. Routine observations will establish whether the MOF sensitivity and stability are suitable for the detection of stellar oscillations.