A Search for Photospheric Sources of Coronal Longitudinal Oscillations

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Scientific paper

It has recently been shown that longitudinal intensity fluctuations observed in TRACE 171 Å loops come in what appear to be two separate populations. These populations are differentiated by their period, and are clustered distinctly around 3 and 5 minute periods. The 3 minute fluctuations appear to be rooted in sunspots, whereas the 5 minute sunspots are not. This study presents two test cases in the search for a photospheric source to these oscillations. A wavelet analysis is presented in the search for a fluctuating magnetic component since previous studies show that a magnetic fluctuation may be intermittent. A Fourier analysis is used to look in the intensity and Doppler regions of the same area of interest. Some comments are made on the photosphere in relation to the search for the driver of the as yet unobserved driver of longitudinal coronal oscillations.

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