Characterizing Outer-belt Electron Flux Variability in Both the Frequency and Time Domains

Details Characterizing Outer-belt Electron Flux Variability in Both the Frequency and Time Domains Characterizing Outer-belt Electron Flux Variability in Both the Frequency and Time Domains

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm32c02r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM32C-02

Physics

2722 Forecasting, 2799 General Or Miscellaneous

Scientific paper

Outer radiation belt energetic electrons exhibit obvious diurnal variability when measured from geosynchronous satellites. This is a consequence of magnetospheric compression by the solar wind pressure. Infinite impulse response (IIR), or recursive filters have been developed which reproduce and predict the diurnal variability based on previous flux measurements or modeled fluxes. This allows the technique of linear prediction filtering to be easily extended to time periods less than the orbit periods of the satellites measuring radiation belt particles. This mapping technique works in the time domain. Therefore it neither requires nor assumes future information, and is ideally suited for real time data analysis and short term prediction. We have also extended our analyses to the frequency domain. Periodicities become readily apparent when a fourier transform of the electron flux time series at geosynchronous altitudes is performed. Frequency-time representations for various data window sizes have been determined, combined, normalized, and incremented over approximately 10 years of GOES >2MeV electron flux data. This provides a global picture, in terms of power spectral density, of a nearly complete solar cycle for periods from seasonal to less than one hour.

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