TY - JOUR
T1 - Wavelet phase coherence analysis
T2 - Application to a quiet-Sun magnetic element
AU - Bloomfield, D. Shaun
AU - McAteer, R. T.James
AU - Lites, Bruce W.
AU - Judge, Philip G.
AU - Mathioudakis, Mihalis
AU - Keenan, Francis P.
PY - 2004/12/10
Y1 - 2004/12/10
N2 - 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.
AB - 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.
KW - Methods: data analysis
KW - Sun: chromosphere
KW - Sun: magnetic fields
KW - Sun: oscillations
UR - https://www.scopus.com/pages/publications/11344258500
U2 - 10.1086/425300
DO - 10.1086/425300
M3 - Article
AN - SCOPUS:11344258500
SN - 0004-637X
VL - 617
SP - 623
EP - 632
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1 I
ER -