Astrophysical: Helioseismology

  • Publication
    Dependence of sunspot photospheric waves on the depth of the source of solar p-modes
    Photospheric waves in sunspots moving radially outward at speeds faster than the characteristic wave velocities have been recently detected. It has been...
  • Publication
    Detecting individual gravity modes in the Sun: Chimera or reality?
    Over the past 15 years, our knowledge of the interior of the Sun has tremendously progressed by the use of helioseismic measurements. However, to go further in...
  • Publication
    Detection and temporal coherence of p-modes below 1.4 mHz
    Data collected recently by the helioseismic experiments aboard the SOHO spacecraft have allowed the detection of low degree p-modes with increasingly lower...
  • Publication
    Disk-integrated Intensity Pseudomodes Measured by SOHO/VIRGO
    The high-frequency spectrum above the acoustic cutoff frequency (νac) of the solar atmosphere has been observed in velocity measurements at low and high angular...
  • Publication
    Eleven years of IRIS frequencies and splittings
    Having acquired since July, 1989, a complete 11-year solar cycle of full disk data, the IRIS++ network has now made available to anyone the longest helioseismic...
  • Publication
    Excitation and Damping of Low-Degree Solar p-Modes during Activity Cycle 23: Analysis of GOLF and VIRGO Sun Photometer Data
    We have used observations made by the Global Oscillations at Low Frequency (GOLF) and the Variability of Irradiance and Gravity Oscillations Sun Photometer...
  • Publication
    Excitation of Solar Acoustic Modes
    The excitation of p-modes seems to be produced by turbulence in the convection zone (see, e.g., Kumar, 1997 and the references therein). Low-degree p-mode...
  • Publication
    FarNet-II: An improved solar far-side active region detection method
    Context. Activity on the far side of the Sun is routinely studied through the analysis of the seismic oscillations detected on the near side using helioseismic...
  • Publication
    Fast-to-Alfvén Mode Conversion Mediated by the Hall Current. I. Cold Plasma Model
    The photospheric temperature minimum in the Sun and solar-like stars is very weakly ionized, with an ionization fraction f as low as 10‑4. In galactic star...