2006/07/15 by D. Salabert, S. J. Jiménez‐Reyes, S. J. Jiménez-Reyes · 1 citation
Physics and Astronomy · #Ionosphere and magnetosphere dynamics #Solar and Space Plasma Dynamics #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/507177
published as Astrophys.J.650:451-460,2006 · 29 pages, 8 figures, Accepted for publication in ApJ
arxiv created 2006/07/15 · openalex publication_date 2006/10/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
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 damping and excitation rates with solar activity. We observe significant variations in the mode height, mode width, and mode velocity power over a wide range of angular-degree values. Their sensitivities to solar activity show clear evidence of frequency dependence, with the modes in the frequency range from 2700 to 3300 μHz showing the largest variations and exhibiting a maximum change centered around 3100 μHz. The mode energy-supply rate is consistent, at the level of precision of the observations, with a zero change during the solar cycle and over the range of studied frequencies. Moreover, the variations with solar activity of each of these parameters are observed to be more or less independent of l over the range of studied angular degrees. Our results provide the first in-depth confirmation of the findings obtained from GONG measurements for intermediate angular degrees.