Astrophysical: Solar activity

  • Publication
    Fragments in sunspots
    High-resolution white light and H-alpha observations are used to study the development of 15 large active solar regions. The behavior of the magnetic fragments...
  • Publication
    Frequency shift of solar p-modes as seen by cross correlation analysis
    Data obtained at the Observatorio del Teide (Tenerife) during the years 1978 to 1988 using a resonant scattering spectrophotometer, is analyzed to look for...
  • Project
    Helio and Astero-Seismology and Exoplanets Search
    The principal objectives of this project are: 1) to study the structure and dynamics of the solar interior, 2) to extend this study to other stars (either...
  • Publication
    Instability and eruption of magnetic flux tubes in the solar convection zone
    We present a consistent model of storage, instability and dynamical eruption of magnetic flux tubes in the solar convection zone and underlying overshoot region...
  • Publication
    Long-term Spatial and Temporal Variations of Aurora Borealis Events in the Period 1700 - 1905
    Catalogues and other records of aurora-borealis events were used to study the long-term spatial and temporal variation of these phenomena in the period from...
  • Publication
    Long-Term Trends and Gleissberg Cycles in Aurora Borealis Records (1600 - 2015)
    The long-term spatial and temporal variation of aurora borealis events from 1600 to the present were studied using catalogues and other records of these...
  • Publication
    Long-term Variation of Solar Activity by a Dynamo Based on Magnetic Flux Tubes
    We show that cyclic activity and Maunder-type grand minima can be explained by a dynamo driven by the instability of magnetic flux tubes in the overshoot layer...
  • Talk
    Magnetic bright points in the quiet Sun
    We present a visual determination of the number of bright points (BPs) existing in the quiet Sun, which are structures though to trace intense kG magnetic...
  • 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...