Astrophysical: Solar oscillations

  • Publication
    Further implications of solar p-modes as measured in NA and K resonance lines
    The ratios between the amplitudes of p-modes measured simultaneously in the Na and K resonance lines are compared with the expected ratios for adiabatic waves...
  • Publication
    Global low frequency acoustic modes after half a solar cycle aboard SOHO: an improved view of the nuclear core
    Solar global oscillations have now been measured for more than 20 years. The study of these modes has contributed to improve, along time, the description of the...
  • Publication
    Ground-based measurements of solar intensity oscillations
    Ground-based multichannel photometry of integral sunlight has been obtained at Izaña (Tenerife) during three months in 1984 with a photometer built at ESTEC...
  • Publication
    Limitations of the Ca II 8542 Å Line for the Determination of Magnetic Field Oscillations
    Chromospheric umbral oscillations produce periodic brightenings in the core of some spectral lines, known as umbral flashes. They are also accompanied by...
  • Publication
    Linewidth of low degree acoustic modes of the Sun
    Estimates of the spectral linewidths of low degree (Q=0 and Q=1) 5 min p-modes obtained from Doppler shift observations in 1984, 1986, and 1987 are reported...
  • Publication
    Linewidths of low-degree acoustic modes of the sun
    Estimates of the spectral linewidths of low degree (l = 0 and l = 1), 5-min p-modes obtained from Doppler shift observations in 1984 (63 d) and 1986 (63 d) are...
  • Publication
    Luminosity Oscillations Imager (LOI)
    The small imaging photometer of the VIRGO (Variability in IRradiance and Gravity Oscillations) investigation on ESA's SOHO mission is presented. This instrument...
  • Talk
    MARK I: an astronomer's lifetime experiment
    Mark I is a part of the origin of the IAC, operating in the El Teide Observatory since 1975, in three different locations until reaching the Solar Pyramid "van...
  • Publication
    Modeling of integrated sunlight velocity measurements: The effect of surface darkening by magnetic fields
    It has been known since the work by Claverie et al. (1982) that integrated-sunlight velocities measured with the resonance scattering technique show variations...