Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-15
Astrophys.J.652:812-819,2006
Astronomy and Astrophysics
Astrophysics
8 pages, 6 figures (4 colour online only), accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/508409
Two sequences of solar images obtained by the Transition Region and Coronal Explorer in three UV passbands are studied using wavelet and Fourier analysis and compared to the photospheric magnetic flux measured by the Michelson Doppler Interferometer on the Solar Heliospheric Observatory to study wave behaviour in differing magnetic environments. Wavelet periods show deviations from the theoretical cutoff value and are interpreted in terms of inclined fields. The variation of wave speeds indicates that a transition from dominant fast-magnetoacoustic waves to slow modes is observed when moving from network into plage and umbrae. This implies preferential transmission of slow modes into the upper atmosphere, where they may lead to heating or be detected in coronal loops and plumes.
Bloomfield Shaun D.
James McAteer R. T.
Keenan Francis P.
Mathioudakis Mihalis
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