Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp31a07k&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP31A-07
Other
7522 Helioseismology, 7536 Solar Activity Cycle (2162), 7594 Instruments And Techniques
Scientific paper
We apply Empirical Mode Decomposition and Hilbert spectral analysis to helioseismic time series to study excitation and damping of solar p-modes. We use time series from the Solar Oscillations Investigation (SOI) project using the Michelson Doppler Imager (MDI) aboard the Solar and Heliospheric Observatory (SOHO) spacecraft. The Hilbert spectral analysis is a tool to analyze nonlinear and nonstationary signals and is used to localize events in time-frequency space. The solar acoustic oscillations are thought to be stochastically excited by the release of acoustic energy from sources near the top of the turbulent convection zone of the Sun. Individual modes are present during some time periods and absent during others. We analyze time series of different l and m values in order to detect individual excitation or damping events. In addition, we compare data sets obtained during different levels of solar magnetic activity to study the influence of magnetic activity on solar p-modes. We will present the latest results of this investigation.
Hill F. F.
Howe Rachel
Komm Rudi
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