Pi2 onset time determination with information criterion

Details Pi2 onset time determination with information criterion Pi2 onset time determination with information criterion

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1107h&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A7, pp. SMP 14-1, CiteID 1107, DOI 10.1029/2001JA003505

Physics

Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Instruments And Techniques

Scientific paper

The present study proposes a new method to identify ground Pi2 onsets. The Pi2 wave is usually examined by applying a linear band-pass filter or something equivalent, such as wavelet convolution, to ground magnetometer data, and its onset is determined based on the amplitude of the extracted wave component. The proposed method is distinguished from such conventional methods in terms of the following points. First the proposed method does not filter or smooth data, rather it analyzes the original data. Second the proposed method determines the Pi2 onset so that the intervals before and after the onset can be optimally described by different time series models. The optimal partition is determined by minimizing the Akaike information criterion (AIC). The time series models adopted are general enough to apply to any nonstationary time series irrespective of its waveform, frequency, amplitude, and signal-to-noise ratio. As a result, the proposed procedure is free from the choice of a threshold and is therefore objective. The procedure is applied to simulation data, and it is confirmed that the procedure can determine the onset with the precision of the data's time resolution. An application to magnetic field data from 210° magnetic meridian (MM) stations suggests that our procedure can be used for examining the latitudinal and longitudinal dependence of the onset time. The proposed procedure is expected to be useful for examining issues that have been difficult to address with conventional methods because of the precision required for determining Pi2 onset.

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