SURFACE WAVES IN SOLAR GRANULATION OBSERVED WITH SUNRISE

Journal Article · Wed Nov 10 00:00:00 EST 2010 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/723/2/L175· OSTI ID:21452699

Roth, M; Franz, M; Bello Gonzalez, N; Berkefeld, T; Schmidt, W ^[1]; Martinez Pillet, V; Bonet, J A ^[2]; Gandorfer, A; Barthol, P; Solanki, S K ^[3]; Del Toro Iniesta, J C ^[4]; Domingo, V ^[5]; Knoelker, M ^[6]

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1. Kiepenheuer-Institut fuer Sonnenphysik, Schoeneckstr. 6, 79104 Freiburg (Germany)
2. Instituto de Astrofisica de Canarias, C/Via Lactea s/n, 38200 La Laguna, Tenerife (Spain)
3. Max-Planck-Institut fuer Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau (Germany)
4. Instituto de Astrofisica de Andalucia (CSIC), Apartado de Correos 3004, 18080 Granada (Spain)
5. Grupo de Astronomia y Ciencias del Espacio, Universidad de Valencia, 46980 Paterna, Valencia (Spain)
6. High Altitude Observatory, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 (United States)

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 {sub 1}-modes with wavenumbers k>1.4 Mm{sup -1}, we also find that exploding granules contribute to the excitation of solar p-modes in addition to the contribution of intergranular lanes.

• OSTI ID: 21452699
• Journal Information: Astrophysical Journal Letters, Vol. 723, Issue 2; Other Information: DOI: 10.1088/2041-8205/723/2/L175; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
PHOTOSPHERE
SOLAR GRANULATION
SOUND WAVES
SPATIAL RESOLUTION
STANDING WAVES
STOCHASTIC PROCESSES
SUN
TURBULENT FLOW
WAVE PROPAGATION
ATMOSPHERES
FLUID FLOW
MAIN SEQUENCE STARS
RESOLUTION
SOLAR ACTIVITY
SOLAR ATMOSPHERE
STARS
STELLAR ACTIVITY
STELLAR ATMOSPHERES