Helioseismic evidence of two solar granulation timescales

H. Vázquez Ramió; C. Régulo; T. Roca Cortés

doi:10.1051/0004-6361:200500191

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Volume 443 / No 1 (November III 2005)

A&A, 443 1 (2005) L11-L14

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Issue		A&A Volume 443, Number 1, November III 2005


Page(s)		L11 - L14
Section		Letters
DOI		https://doi.org/10.1051/0004-6361:200500191
Published online		21 October 2005

A&A 443, L11-L14 (2005)

Letter to the Editor

Helioseismic evidence of two solar granulation timescales

H. Vázquez Ramió¹, C. Régulo¹^,2 and T. Roca Cortés¹^,2

¹ Instituto de Astrofísica de Canarias, 38200 La Laguna (Tenerife), Spain e-mail: hvr@iac.es
² Dpto. de Astrofísica, Universidad de La Laguna, 38206 La Laguna (Tenerife), Spain e-mail: crr@iac.es,trc@iac.es

Received: 14 July 2005
Accepted: 17 September 2005

Abstract

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 ( $\tau_{{\rm GR1}}\approx 237~{\rm s}$ and $\tau_{{\rm GR2}}\approx 62~{\rm s}$ ) 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

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