Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.2610b&link_type=abstract
American Astronomical Society, SPD meeting #34, #26.10; Bulletin of the American Astronomical Society, Vol. 35, p.855
Astronomy and Astrophysics
Astronomy
Scientific paper
The solar oscillation parameters, as the frequency, are usually determined by fitting a theoretical profile to the observed Doppler velocity (V) power spectrum. We present here the solar oscillation parameters determined using GONG V data as well as Intensity (I) data. To do that, we used Severino et al. (2001, ApJ 561,444) model to reproduce the following 4 helioseismic spectra: V and I power spectrum, I-V phase difference and coherence spectra. This model is based on a coherent resonant p-mode signal; two coherent background components, one correlated and one uncorrelated to the oscillation modes; and, finally, the uncoherent noise. Using this model, we have fitted simultaneously the 4 helioseismic spectra mentioned above for several hundreds modes between l=15 and 50 and for 9 GONG months rotation corrected m-average data around the solar minimum. The solar oscillation parameters (frequency, amplitude and width) obtained by this way will be presented as well as a comparison with the results obtained using only V data. The study of the background components used in the model with the aim of better understanding the solar oscillation excitation mechanism will be addressed.
This work is supported by NASA grant NAG5-11703.
Barban Caroline
Hill F. F.
No associations
LandOfFree
Estimates of helioseismic oscillation excitation parameters from multi-spectral fitting. 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 Estimates of helioseismic oscillation excitation parameters from multi-spectral fitting., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Estimates of helioseismic oscillation excitation parameters from multi-spectral fitting. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-988913