Observation and Modeling of Coronal "Moss" With the EUV Imaging Spectrometer on Hinode

Abstract

Observations of transition region emission in solar active regions represent a powerful tool for determining the properties of hot coronal loops. In this Letter we present the analysis of new observations of active region moss taken with the Extreme Ultraviolet Imaging Spectrometer (EIS) on the \textit{Hinode} mission. We find that the intensities predicted by steady, uniformly heated loop models are too intense relative to the observations, consistent with previous work. To bring the model into agreement with the observations a filling factor of about 16% is required. Furthermore, our analysis indicates that the filling factor in the moss is nonuniform and varies inversely with the loop pressure.

References in corpus (3)

• Ionization balance for optically thin plasmas: rate coefficients for all atoms and ions of the elements H to Ni
• Hydrostatic Modeling of the Integrated Soft X-Ray and EUV Emission in Solar Active Regions
• Observations of Transient Active Region Heating with Hinode

Cited by in corpus (27)

• Heating of the Solar Chromosphere and Corona by Alfven Wave Turbulence
• Observing coronal nanoflares in active region moss
• Observations of Active Region Loops with the EUV Imaging Spectrometer on Hinode
• Coronal Loops: Observations and Modeling of Confined Plasma
• Active region transition region loop populations and their relationship to the corona
• Propagating slow magnetoacoustic waves in coronal loops observed by Hinode/EIS
• Investigating the response of loop plasma to nanoflare heating using RADYN simulations
• The High-Resolution Coronal Imager, Flight 2.1
• Measurements of Non-Thermal Line Widths in Solar Active Regions
• Evidence for Steady Heating: Observations of an Active Region Core with Hinode and TRACE
• Flows and Motions in Moss in the Core of a Flaring Active Region: Evidence for Steady Heating
• The Heating of Solar Coronal Loops by Alfven Wave Turbulence
• IRIS observations of short-term variability in moss associated with transient hot coronal loops
• Active Region Moss: Basic physical parameters and their temporal variation
• Hot Plasma in Non-Flaring Active Regions Observed by the Extreme-ultraviolet Imaging Spectrometer on Hinode
• Evidence of Impulsive Heating in Active Region Core Loops
• Estimating the Chromospheric Absorption of Transition Region Moss Emission
• Observations of Plasma Upflow in a Warm Loop with Hinode/EIS
• Incorporating Uncertainties in Atomic Data Into the Analysis of Solar and Stellar Observations: A Case Study in Fe XIII
• Can Large Time Delays Observed in Light Curves of Coronal Loops be Explained by Impulsive Heating?
• Active Region Moss: Doppler Shifts from Hinode/EIS Observations
• Magnetic loops above a small flux-emerging region observed by IRIS, Hinode and SDO
• Doppler shift of hot coronal lines in a moss area of an active region
• Role of small-scale impulsive events in heating the X-ray bright points of the quiet Sun
• The Role of Magnetic Topology in the Heating of Active Region Coronal Loops
• Characteristics and Evolution of the Magnetic field and Chromospheric Emission in an Active Region Core Observed by Hinode
• Plasma Diagnostics From Active Region and Quiet Sun Spectra Observed by Hinode/EIS: Quantifying the Departures from a Maxwellian Distribution