On active region loops: Hinode/EIS observations

Abstract

Coronal loops are fundamental building blocks of the solar active regions and the corona. Therefore, a clear understanding of the physics of coronal loops will help us understand the physics of active region heating in particular and coronal heating in general. This requires a precise measurement of physical quantities such as electron densities and filling factors, temperatures, and flows in coronal loops. In this paper we have carried out an investigation of a spatially well resolved coronal loop using the EIS onboard Hinode to measure the above mentioned physical quantities. Based on this study we find that a nano-flare model could explain most of the observed characteristics of this loop.

27 pages, 7 figures, Accepted in ApJ

References in corpus (8)

• EUV emission lines and diagnostics observed with Hinode/EIS
• High precision density measurements in the solar corona: I. Analysis methods and results for Fe XII and Fe XIII
• Flows and Non-thermal Velocities in Solar Active Regions Observed with the Extreme-ultraviolet Imaging Spectrometer on Hinode: A Tracer of Active Region Sources of Heliospheric Magnetic Fields?
• Observations of Active Region Loops with the EUV Imaging Spectrometer on Hinode
• Transition region features observed with Hinode/EIS
• Density structure of an active region and associated moss using Hinode/EIS
• Plasma Diagnostics of Active Region Evolution and Implications for Coronal Heating
• The redshifted network contrast of transition region emission

Cited by in corpus (86)

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• Solar science with the Atacama Large Millimeter/submillimeter Array - A new view of our Sun
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• The multi-thermal and multi-stranded nature of coronal rain
• Asymmetries of solar coronal extreme ultraviolet emission lines
• Emission Measure Distribution and Heating of Two Active Region Cores
• The Temperature Dependence of Solar Active Region Outflows
• Velocity measurements for a solar active region fan loop from Hinode/EIS observations
• Mapping the magnetic field in the solar corona through magnetoseismology
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• On-disk coronal rain
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• Modeling the Line-of-Sight Integrated Emission in the Corona: Implications for Coronal Heating
• Propagating Disturbances in Coronal Loops: A Detailed Analysis of Propagation Speeds
• Solar Dynamics Observatory discovers thin high temperature strands in coronal active regions
• Upflows in the upper solar atmosphere
• Is the High-Resolution Coronal Imager Resolving Coronal Strands? Results from AR 12712
• The Heating of Solar Coronal Loops by Alfven Wave Turbulence
• Active Region Moss: Basic physical parameters and their temporal variation
• The effects of numerical resolution, heating timescales and background heating on thermal non-equilibrium in coronal loops
• Observing the formation of flare-driven coronal rain
• Coronal rain in randomly heated arcades
• Cool transition region loops observed by the Interface Region Imaging Spectrograph
• Evidence of Impulsive Heating in Active Region Core Loops
• The instability and non-existence of multi-stranded loops, when driven by transverse waves
• Simulating coronal condensation dynamics in 3D
• Plasma parameters and geometry of cool and warm active region loops
• A closer look at a coronal loop rooted in a sunspot umbra
• Coronal fuzziness modelled with pulse-heated multistranded loop systems
• Periods and damping rates of fast sausage oscillations in multi-shelled coronal loops
• A solar coronal loop in a box: Energy generation and heating
• The Evolution of the EM Distribution in the Core of an Active Region
• Spectroscopic Observations of a Coronal Loop: Basic Physical Plasma Parameters Along the Full Loop Length
• Flows at the Edge of an Active Region: Observation and Interpretation
• The 3D geometry of active region upflows deduced from their limb-to-limb evolution
• Observations of Plasma Upflow in a Warm Loop with Hinode/EIS
• Wave heating in simulated multi-stranded coronal loops
• Newly Discovered Global Temperature Structures in the Quiet Sun at Solar Minimum
• Modeling Evolving Coronal Loops with Observations from STEREO, Hinode, and TRACE
• Fan Loops Observed by IRIS, EIS and AIA
• Active Region Moss: Doppler Shifts from Hinode/EIS Observations
• High-resolution observations of active region moss and its dynamics
• On the formation of solar wind & switchbacks, and quiet Sun heating
• Heating and cooling of coronal loops observed by SDO
• Unravelling the components of a multi-thermal coronal loop using magnetohydrodynamic seismology
• 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
• Observation and Modeling of Chromospheric Evaporation in a Coronal Loop Related to Active Region Transient Brightening
• The First Flight of the Marshall Grazing Incidence X-ray Spectrometer (MaGIXS)
• Broadening of the DEM by multi-shelled and turbulent loops
• Heating Mechanisms for Intermittent Loops in Active Region Cores from AIA/SDO EUV Observations
• Spectroscopic evidence of Alfvén wave damping in the off-limb solar corona
• Emission Measure Distribution for Diffuse Regions in Solar Active Regions
• Dark Post-Flare Loops Observed by Solar Dynamics Observatory
• A comparison of the active region upflow and core properties using simultaneous spectroscopic observations from IRIS and Hinode
• Energetics of Hi-C EUV Brightenings
• Magnetic filed dynamics and varying plasma emission in large coronal loops
• Exploring the damping of Alfvén waves along a long off-limb coronal loop, up to 1.4 R${}_{\odot }$
• On the Impulsive Heating of Quiet Solar Corona
• An ultra-long and quite thin coronal loop without significant expansion
• Electron Densities in the Solar Corona Measured Simultaneously in the Extreme-Ultraviolet and Infra-Red
• On the Area Expansion of Magnetic Flux-Tubes in Solar Active Regions
• Transient Formation of Loops in the Core of an Active Region
• Robust construction of differential emission measure profiles using a regularized maximum likelihood method
• Non-equilibrium ionization by a periodic electron beam. I. Synthetic coronal spectra and implications for interpretation of observations
• Reconnection generated plasma flows in the quasi-separatrix layer in localised solar corona
• On Doppler shift and its Center-to-Limb Variation in Active Regions in the Transition Region
• Direct Observations of Plasma Upflows and Condensation in a Catastrophically Cooling Solar Transition Region Loop
• Temperature and Differential Emission Measure Profiles in Turbulent Solar Active Region Loops
• Center to limb variation of transition region Doppler shift in active regions
• Characteristics and Evolution of the Magnetic field and Chromospheric Emission in an Active Region Core Observed by Hinode
• Variation of Emission Line Width in Mid- and High-Latitude Corona
• How transverse MHD wave-driven turbulence influences the density filling factor in the solar corona?
• Formation and Dynamics of Transequatorial Loops
• Influence of fine structures on gyrosynchrotron emission of flare loops modulated by sausage modes
• Multi-strand coronal loop model and filter-ratio analysis
• Solar Atmospheric Magnetic Energy Coupling: Broad Plasma Conditions and Spectrum Regimes
• Anomalous cross-field motions of solar coronal loops
• A new view of the solar interface region from the Interface Region Imaging Spectrograph (IRIS)
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• Plasma Diagnostics From Active Region and Quiet Sun Spectra Observed by Hinode/EIS: Quantifying the Departures from a Maxwellian Distribution