Wavelet Phase Coherence Analysis: Application to a Quiet-Sun Magnetic Element

Details Wavelet Phase Coherence Analysis: Application to a Quiet-Sun Magnetic Element Wavelet Phase Coherence Analysis: Application to a Quiet-Sun Magnetic Element

Publishing date

Dec 2004

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...617..623b&link_type=abstract

Journals

The Astrophysical Journal, Volume 617, Issue 1, pp. 623-632.

Science

Astronomy and Astrophysics

Field

Astronomy

Additional info 2

13

Additional info 3

Methods: Data Analysis, Sun: Chromosphere, Sun: Magnetic Fields, Sun: Oscillations

Type

Scientific paper

Abstract

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 Å and SOHO/SUMER C II 1037 Å 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.

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