34th Solar Physics Division Meeting, June 2003
Session 7 Photosphere and Chromosphere I
Poster, Monday, June 16, 2003, 3:30-5:00pm, Mezzanine

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[7.01] Chromospheric Oscillations observed by SUMER and TRACE: Their Interplay with the Solar Plasma Topography

S. W. McIntosh, B. Fleck (ESA RSSD)

We present the results of an investigation into the interaction of wave modes with the solar chromospheric plasma's topography through the analysis of joint SOHO/SUMER and TRACE observations. We show that there is a distinct correlation between the inferred solar plasma topography (specifically the height of the transition from a high to low plasma-beta regime) and the phase differences between, and suppression of, atmospheric/chromospheric oscillations in different levels of the solar atmosphere. Indeed, we demonstrate that the spectroscopic signal observed changes dramatically in the passage from the high to low beta regimes. We propose that the dependences presented can be used as an interpretative tool for simulations seeking to model chromospheric oscillations and as a diagnostics of the plasma conditions in the important region in the mid-chromosphere where the plasma-beta is of order unity, through the signatures of the wave-modes present.


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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.