M. Roth

Publications (4)5.53 Total impact

• Article: Surface Waves in Solar Granulation Observed with SUNRISE

  M. Roth, M. Franz, N. Bello González, V. Martínez Pillet, J. A. Bonet, A. Gandorfer, P. Barthol, S. K. Solanki, T. Berkefeld, W. Schmidt, J. C. del Toro Iniesta, V. Domingo, and M. Knölker
  [show abstract] [hide abstract]
  ABSTRACT: Solar oscillations are expected to be excited by turbulent flows in the intergranular lanes near the solar surface. Time series recorded by the IMaX instrument on board the SUNRISE observatory reveal solar oscillations at high spatial resolution, which allow the study of the properties of oscillations with short wavelengths. We analyze two time series with synchronous recordings of Doppler velocity and continuum intensity images with durations of 32 minutes and 23 minutes, respectively, recorded close to the disk center of the Sun to study the propagation and excitation of solar acoustic oscillations. In the Doppler velocity data, both the standing acoustic waves and the short-lived, high-degree running waves are visible. The standing waves are visible as temporary enhancements of the amplitudes of the large-scale velocity field due to the stochastic superposition of the acoustic waves. We focus on the high-degree small-scale waves by suitable filtering in the Fourier domain. Investigating the propagation and excitation of f- and p 1-modes with wavenumbers k>1.4 Mm–1, we also find that exploding granules contribute to the excitation of solar p-modes in addition to the contribution of intergranular lanes.
  The Astrophysical Journal Letters 10/2010; 723(2):L175. · 5.53 Impact Factor
• Source

  Available from: Wolfgang Schmidt

  Article: Surface waves in solar granulation observed with {\sc Sunrise}

  M. Roth, M. Franz, N. Bello González, V. Martínez Pillet, J. A. Bonet, A. Gandorfer, P. Barthol, S. K. Solanki, T. Berkefeld, W Schmidt, J. C. del Toro Iniesta, V. Domingo, M. Knölker
  [show abstract] [hide abstract]
  ABSTRACT: Solar oscillations are expected to be excited by turbulent flows in the intergranular lanes near the solar surface. Time series recorded by the IMaX instrument aboard the {\sc Sunrise} observatory reveal solar oscillations at high resolution, which allow studying the properties of oscillations with short wavelengths. We analyze two times series with synchronous recordings of Doppler velocity and continuum intensity images with durations of 32\thinspace min and 23\thinspace min, resp., recorded close to the disk center of the Sun to study the propagation and excitation of solar acoustic oscillations. In the Doppler velocity data, both the standing acoustic waves and the short-lived, high-degree running waves are visible. The standing waves are visible as temporary enhancements of the amplitudes of the large-scale velocity field due to the stochastic superposition of the acoustic waves. We focus on the high-degree small-scale waves by suitable filtering in the Fourier domain. Investigating the propagation and excitation of $f$- and $p_1$-modes with wave numbers $k > 1.4$\thinspace 1/Mm we find that also exploding granules contribute to the excitation of solar $p$-modes in addition to the contribution of intergranular lanes. Comment: 12 pages, 4 figures, to appear in a special volume on Sunrise in Astrophysical Journal Letters
  09/2010;
• Source

  Available from: Wolfgang Schmidt

  Article: The Sun at high resolution: first results from the Sunrise mission

  S. K. Solanki, P. Barthol, S. Danilovic, A. Feller, A. Gandorfer, J. Hirzberger, A. Lagg, T. L. Riethmüller, M. Schüssler, T. Wiegelmann, [......], J. Palacios, M. Knölker, N. Bello González, J. M. Borrero, T. Berkefeld, M. Franz, M. Roth, W. Schmidt, O. Steiner, A. M. Title
  [show abstract] [hide abstract]
  ABSTRACT: The Sunrise balloon-borne solar observatory consists of a 1m aperture Gregory telescope, a UV filter imager, an imaging vector polarimeter, an image stabilization system and further infrastructure. The first science flight of Sunrise yielded high-quality data that reveal the structure, dynamics and evolution of solar convection, oscillations and magnetic fields at a resolution of around 100 km in the quiet Sun. Here we describe very briefly the mission and the first results obtained from the Sunrise data, which include a number of discoveries.
  Proceedings of the International Astronomical Union 07/2010; 6:226 - 232.
• Article: Surface Waves in Solar Granulation Observed with SUNRISE

  M. Roth, M. Franz, N. Bello Gonzalez, V. Martinez Pillet, J. A. Bonet, A. Gandorfer, P. Barthol, S. K. Solanki, T. Berkefeld, W Schmidt, J. C. del Toro Iniesta, V. Domingo, M. Knölker
  Astrophysical Journal, v.723, L175-L179 (2010).