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Title: CAN THE DIFFERENTIAL EMISSION MEASURE CONSTRAIN THE TIMESCALE OF ENERGY DEPOSITION IN THE CORONA?

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.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Institut d'Astrophysique Spatiale, Batiment 121, CNRS/Universite Paris-Sud, F-91405 Orsay (France)
  2. Solar Physics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD (United States)
  3. Royal Observatory of Belgium, 3 Avenue Circulaire, B-1180 Bruxelles (Belgium)
Publication Date:
OSTI Identifier:
22133970
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 774; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; EMISSION; ENERGY ABSORPTION; ENERGY LOSSES; HIGH-FREQUENCY HEATING; SOLAR CORONA; TIME DEPENDENCE