Can the Differential Emission Measure constrain the timescale of energy deposition

Abstract

In this paper, the ability of the Hinode/EIS instrument to detect radiative signatures of coronal heating is investigated. Recent observational studies of AR 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 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 $\pm 1.0$, in the more favorable cases.

29 pages, 8 figures

References in corpus (4)

• A Contemporary View of Coronal Heating
• Non-equilibrium of Ionization and the Detection of Hot Plasma in Nanoflare-heated Coronal Loops
• Diagnosing the time-dependence of active region core heating from the emission measure: II. Nanoflare trains
• The Cooling of Coronal Plasmas. iv: Catastrophic Cooling of Loops

Cited by in corpus (30)

• Thermal Diagnostics with the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory: A Validated Method for Differential Emission Measure Inversions
• Key Aspects of Coronal Heating
• Do cloud-cloud collisions trigger high-mass star formation? I. Small cloud collisions
• On The Fourier And Wavelet Analysis Of Coronal Time Series
• Evidence for evaporation-incomplete condensation cycles in warm solar coronal loops
• On the occurrence of thermal non-equilibrium in coronal loops
• Long-Period Intensity Pulsations in Coronal Loops Explained by Thermal Non-Equilibrium Cycles
• The Coronal Monsoon: Thermal Nonequilibrium Revealed by Periodic Coronal Rain
• Order out of Randomness : Self-Organization Processes in Astrophysics
• Spectral Modeling of the Charge-Exchange X-ray Emission from M82
• Inference of Heating Properties from "Hot" Non-flaring Plasmas in Active Region Cores. II. Nanoflare Trains
• Determining heating time scales in solar active region cores from AIA/SDO Fe XVIII images
• Constraining Hot Plasma in a Non-flaring Solar Active Region with FOXSI Hard X-ray Observations
• The Evolution of the EM Distribution in the Core of an Active Region
• Understanding Heating in Active Region Cores through Machine Learning I. Numerical Modeling and Predicted Observables
• 2D cellular automaton model for the evolution of active region coronal plasmas
• Thermal non-equilibriuem revealed by periodic pulses of random amplitudes in solar coronal loops
• RESIK Solar X-ray flare element abundances on a non-isothermal assumption
• The First Flight of the Marshall Grazing Incidence X-ray Spectrometer (MaGIXS)
• Static and dynamic solar coronal loops with cross-sectional area variations
• Uncertainties on atomic data. A case study: N IV
• Spectroscopic evidence of cool plasma in quiet Sun HRIEUV small scale brightenings
• Emission Measure Distribution for Diffuse Regions in Solar Active Regions
• Relative Abundance Measurements in Plumes and Interplumes
• Modeling Active Region Transient Brightenings Observed with XRT as Multi-Stranded Loops
• Sparse Bayesian Inference and the Temperature Structure of the Solar Corona
• Thermal characteristics and the differential emission measure distribution during a B8.3 flare on July 04, 2009
• Nanoflare Diagnostics from Magnetohydrodynamic Heating Profiles
• The Slowly Varying Corona. II. The Components of F ${}_{10.7}$ and Their Use in EUV Proxies
• Multifractal Solar EUV Intensity Fluctuations and their Implications for Coronal Heating Models