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- W2144403963 abstract "An EIT shutterless campaign was conducted on 11 July 2001 and provided 120 high-cadence (68 s) 30.4 nm images of the north-eastern quarter of the Sun. Systematic intensity variations are seen which appear to propagate along an off-disk loop-like structure. In this paper we study the nature of these intensity variations by confronting the EIT observations studied in De Groof et al. (2004, A&A, 415, 1141) with simultaneous Hα images from Big Bear Solar Observatory. With the goal to carefully co-register the two image sets, we introduce a technique designed to compare data of two different instruments. The image series are first co-aligned and later overplotted in order to visualize and compare the behaviour of the propagating disturbances in both data sets. Since the same intensity variations are seen in the EIT 30.4 nm and in the Hα images, we confirm the interpretation of De Groof et al. (2004, A&A, 415, 1141) that we are observing downflows of relatively cool plasma. The origin of the downflows is explained by numerical simulations of “catastrophic cooling” in a coronal loop which is heated predominantly at its footpoints." @default.
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- W2144403963 date "2005-10-21" @default.
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- W2144403963 title "Detailed comparison of downflows seen both in EIT 30.4 nm and Big Bear H<i>α</i> movies" @default.
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- W2144403963 doi "https://doi.org/10.1051/0004-6361:20053129" @default.
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