Fitting fft-derived spectra: Theory, tool, and application to solar radio spike decomposition

Gelu Nita, Gregory Fleishman, Dale Gary, William Marin, Kristine Boone

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Spectra derived from fast Fourier transform (FFT) analysis of time-domain data intrinsically contain statistical fluctuations whose distribution depends on the number of accumulated spectra contributing to a measurement. The tail of this distribution, which is essential for separating the true signal from the statistical fluctuations, deviates noticeably from the normal distribution for a finite number of accumulations. In this paper, we develop a theory to properly account for the statistical fluctuations when fitting a model to a given accumulated spectrum. The method is implemented in software for the purpose of automatically fitting a large body of such FFT-derived spectra. We apply this tool to analyze a portion of a dense cluster of spikes recorded by our FASR Subsystem Testbed instrument during a record-breaking event that occurred on 2006 December 6. The outcome of this analysis is briefly discussed.

Original languageEnglish (US)
Article number152
JournalAstrophysical Journal
Volume789
Issue number2
DOIs
StatePublished - Jul 10 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: radio radiation
  • instrumentation: spectrographs
  • methods: analytical
  • methods: data analysis
  • methods: numerical
  • methods: statistical

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