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Can the Differential Emission Measure Constrain the Timescale of Energy Deposition in the Corona?

TitleCan the Differential Emission Measure Constrain the Timescale of Energy Deposition in the Corona?
Publication TypeJournal Article
Year of Publication2013
AuthorsGuennou, C, Auchere, F, Klimchuk, JA, Bocchialini, K, Parenti, S
JournalThe Astrophysical Journal
Volume774
Pagination31
Date PublishedSeptember 1, 2013
ISBN Number0004-637X
Keywordsplasmas, Sun: corona, Sun: UV radiation, techniques: spectroscopic
Abstract

In this paper, the ability of the Hinode/EIS instrument to detect radiative signatures of coronal heating is investigated. Recent observational studies of active region cores suggest that both the low and high frequency heating mechanisms are consistent with observations. Distinguishing between these possibilities is important for identifying the physical mechanism(s) of the heating. The differential emission measure (DEM) tool is one diagnostic that allows us to make this distinction, through the amplitude of the DEM slope coolward of the coronal peak. It is therefore crucial to understand the uncertainties associated with these measurements. Using proper estimations of the uncertainties involved in the problem of DEM inversion, we derive confidence levels on the observed DEM slope. Results show that the uncertainty in the slope reconstruction strongly depends on the number of lines constraining the slope. Typical uncertainty is estimated to be about ±1.0 in the more favorable cases.

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