Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-09-15
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Paper accepted in ApJ. 26 Pages, 9 figures
Scientific paper
The acoustic cut-off frequency -the highest frequency for acoustic solar eigenmodes- is an important parameter of the solar atmosphere as it determines the upper boundary of the p-mode resonant cavities. At frequencies beyond this value, acoustic disturbances are no longer trapped but traveling waves. Interference amongst them give rise to higher-frequency peaks -the pseudomodes- in the solar acoustic spectrum. The pseudomodes are shifted slightly in frequency with respect to p modes making possible the use of pseudomodes to determine the acoustic cut-off frequency. Using data from GOLF and VIRGO instruments on board the SOHO spacecraft, we calculate the acoustic cut-off frequency using the coherence function between both the velocity and intensity sets of data. By using data gathered by these instruments during the entire lifetime of the mission (1996 till the present), a variation in the acoustic cut-off frequency with the solar magnetic activity cycle is found.
Garcia Rafael A.
Jimenez Arturo
Pallé Pere Lluis
No associations
LandOfFree
The acoustic cut-off frequency of the Sun and the solar magnetic activity cycle does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The acoustic cut-off frequency of the Sun and the solar magnetic activity cycle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The acoustic cut-off frequency of the Sun and the solar magnetic activity cycle will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-673401