Global Wave Characteristics of Pi 2 Pulsations Extracted by Independent Component Analysis

Details Global Wave Characteristics of Pi 2 Pulsations Extracted by Independent Component Analysis Global Wave Characteristics of Pi 2 Pulsations Extracted by Independent Component Analysis

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41b1465t&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM41B-1465

Other

2431 Ionosphere/Magnetosphere Interactions (2736), 2736 Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

Low-latitude Pi 2 pulsations can be explained by cavity resonance of the inner magnetosphere. On the other hand, high-latitude Pi 2 pulsations are mainly caused in association with shear Alfven wave excited at high- latitude magnetic shells or westward auroral electrojets during substorm. Consequently, Pi 2 pulsations observed on the ground are a superposition of several different components, so that the global structure of Pi 2 pulsations is still unclear, especially the relationship between high- and low-latitude Pi 2. In this report, we applied the so-called Independent Component Analysis (ICA) to analyze the global wave characteristics of Pi 2 pulsations. ICA is the method for finding underlying factors or components from multidimensional statistical data. It started to be used in 1990s in the field of signal processing and has been successful in resolving observed mixed signals, including brain imaging data and voice signals. With ICA, it is presumed that the observed signals formed by linear mixing, and the mixing system is unknown. The source signals assumed non-Gaussian and statistically independent of each other.

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