Wavelet phase coherence analysis: Application to a quiet-sun magnetic element

Francis Keenan, Shaun Bloomfield, Michail Mathioudakis, R.T.J. McAteer, B.W. Lites, P.G. Judge

Research output: Contribution to journalArticlepeer-review

105 Citations (Scopus)


A new application of wavelet analysis is presented that utilizes the inherent phase information residing within the complex Morlet transform. The technique is applied to a weak solar magnetic network region, and the temporal variation of phase difference between TRACE 1700 Angstrom and SOHO/SUMER C II 1037 Angstrom intensities is shown. We present, for the first time in an astrophysical setting, the application of wavelet phase coherence, including a comparison between two methods of testing real wavelet phase coherence against that of noise. The example highlights the advantage of wavelet analysis over more classical techniques, such as Fourier analysis, and the effectiveness of the former to identify wave packets of similar frequencies but with differing phase relations is emphasized. Using cotemporal, ground-based Advanced Stokes Polarimeter measurements, changes in the observed phase differences are shown to result from alterations in the magnetic topology.
Original languageEnglish
Pages (from-to)623-632
Number of pages10
JournalAstrophysical Journal
Issue number1 I
Publication statusPublished - 10 Dec 2004

ASJC Scopus subject areas

  • Space and Planetary Science


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