Astrophysical: Helioseismology

  • Installation
    Tacometro de Fourier
    Modified Michelson interferometer (Fourier Tachometer) providing high resolution solar images of intensity, radial velocity and magnetograms at Niquel NI 676.8...
  • Publication
    The 160 minute solar oscillation - an artifact?
    Analysis of data obtained over the years 1980-1985 are analyzed to show that the period of the 160-minute signal is indeed 160.00 minutes. It is demonstrated...
  • Publication
    The Acoustic Cutoff Frequency of the Sun and the Solar Magnetic Activity Cycle
    The acoustic cutoff frequency—the highest frequency for acoustic solar eigenmodes—is an important parameter of the solar atmosphere as it determines the upper...
  • Publication
    The Dynamics of the Solar Radiative Zone
    The dynamics of the solar radiative interior are still poorly constrained by comparison to the convective zone. This disparity is even more marked when we...
  • Publication
    The Global Oscillation Network Group site survey, 2: Results
    The Global Oscillation Network Group (GONG) Project will place a network of instruments around the world to observe solar oscillations as continuously as...
  • Publication
    The low L solar p-mode spectrum at maximum and minimum solar activity
    Velocity measurements of disc integrated sunlight obtained at the Observatorio del Teide (Izana) from 1980 throughout 1989 are used to find the frequencies and...
  • Publication
    The Mark-I helioseismic experiment - I. Measurements of the solar gravitational redshift (1976-2013)
    The resonant scattering solar spectrophotometer `Mark-I', designed and build at the University of Birmingham (UK) and located at the Observatorio del Teide...
  • Publication
    The onset of solar cycle 24. What global acoustic modes are telling us
    We study the response of the low-degree, solar p-mode frequencies to the unusually extended minimum of solar surface activity since 2007. A total of 4768 days...
  • Publication
    The p-mode spectrum measured in intensity: from 1996 to 2000
    VIRGO-SPM is a helioseismic instrument on board SOHO that observe the disk-integrated sunlight irradiance at three different colours (red, green and blue). In...