Letter to the Editor
Helioseismic evidence of two solar granulation timescales
Instituto de Astrofísica de Canarias, 38200 La Laguna (Tenerife), Spain e-mail: email@example.com
2 Dpto. de Astrofísica, Universidad de La Laguna, 38206 La Laguna (Tenerife), Spain e-mail: firstname.lastname@example.org,email@example.com
Accepted: 17 September 2005
The signature of two different scales of solar granulation in the power spectrum of disk integrated irradiance time series is presented. The fitted timescales for granulation ( and ) are in good agreement with the characteristic lifetimes derived from recent image time series of the Sun's surface (Del Moro 2004); and probably linked to magnetic chromospheric structures such as bright points (Harvey et al. 1993).
Key words: Sun: helioseismology / Sun: photosphere / Sun: granulation / Sun: activity
© ESO, 2005