Astrophysical: Helioseismology

  • Publication
    An Estimation of the Acoustic Cutoff Frequency of the Sun Based on the Properties of the Low-Degree Pseudomodes
    The acoustic cutoff frequency (νac) is an important atmospheric parameter whose estimation has in the past been based on the study of power spectra that have...
  • Publication
    An Iterative OLA Method for Inversion of Solar Spectropolarimetric Data. I. Single- and Multiple-variable Inversions of Thermodynamic Quantities
    This paper describes an adaptation of the Optimally Localized Averaging (OLA) inversion technique, originally developed for geo- and helioseismological...
  • Publication
    An Upper Limit on the Temporal Variations of the Solar Interior Stratification
    We have analyzed changes in the acoustic oscillation eigenfrequencies measured over the past 7 years by the GONG, MDI, and LOWL instruments. The observations...
  • Publication
    Asymptotic g modes: Evidence for a rapid rotation of the solar core
    Context. Over the past 40 years, helioseismology has been enormously successful in the study of the solar interior. A shortcoming has been the lack of a...
  • Publication
    Atmospheric Extinction Coefficients in the Ic Band for Several Major International Observatories: Results from the BiSON Telescopes, 1984-2016
    Over 30 years of solar data have been acquired by the Birmingham Solar Oscillations Network (BiSON), an international network of telescopes used to study...
  • Publication
    Can solar g-modes be identified from ground-based velocity measurements
    The question of whether or not solar g-modes can be detected and identified from ground observations is addressed. The limitation imposed by the Earth's...
  • Talk
    Collapsograms: measurement of low signal-to-noise-ratio solar p modes in spatially-resolved helioseismic data
    1.- I will give an overview of WeCAPP (Wendelstein Calar Alto Pixellensing Project), a microlensing survey towards the Andromeda galaxy. WeCAPP monitored the...
  • Publication
    Comparison of parameters of low l solar p-modes at maximum and minimum activity
    Velocity measurements of disk integrated sunlight obtained by GOLF experiment aboard SOHO are used to find the parameters of solar p-modes (l
  • Publication
    Damping and Excitation Variations of the Solar Acoustic Modes Using LOWL Observations
    We have used observations made with the helioseismic instrument LOWL collected over ~6 years to carry out an independent study of the variations of the p-mode...