Nanoflare Diagnostics from Magnetohydrodynamic Heating Profiles

Abstract

The nanoflare paradigm of coronal heating has proven extremely promising for explaining the presence of hot, multi-million degree loops in the solar corona. In this paradigm, localized heating events supply enough energy to heat the solar atmosphere to its observed temperatures. Rigorously modeling this process, however, has proven difficult, since it requires an accurate treatment of both the magnetic field dynamics and reconnection as well as the plasma's response to magnetic perturbations. In this paper, we combine fully 3D magnetohydrodynamic (MHD) simulations of coronal active region plasma driven by photospheric motions with spatially-averaged, time-dependent hydrodynamic (HD) modeling of coronal loops to obtain physically motivated observables that can be quantitatively compared with observational measurements of active region cores. We take the behavior of reconnected field lines from the MHD simulation and use them to populate the HD model to obtain the thermodynamic evolution of the plasma and subsequently the emission measure distribution. We find the that the photospheric driving of the MHD model produces only very low-frequency nanoflare heating which cannot account for the full range of active region core observations as measured by the low-temperature emission measure slope. Additionally, we calculate the spatial and temporal distributions of field lines exhibiting collective behavior, and argue that loops occur due to random energization occurring on clusters of adjacent field lines.

References in corpus (39)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• On Solving the Coronal Heating Problem
• Highly Efficient Modeling of Dynamic Coronal Loops
• Key Aspects of Coronal Heating
• A Systematic Survey of High Temperature Emission in Solar Active Regions
• Numerical simulations of active region scale flux emergence: From spot formation to decay
• Constraints on the Heating of High Temperature Active Region Loops: Observations from Hinode and SDO
• Enthalpy-based Thermal Evolution of Loops: II. Improvements to the Model
• Intermittent heating in the solar corona employing a 3D MHD model
• Using a Differential Emission Measure and Density Measurements in an Active Region Core to Test a Steady Heating Model
• High Spatial Resolution Observations of Loops in the Solar Corona
• Coronal Loops: Observations and Modeling of Confined Plasma
• Structures in magnetohydrodynamic turbulence: detection and scaling
• Emission Measure Distribution and Heating of Two Active Region Cores
• Diagnosing the time-dependence of active region core heating from the emission measure: I. Low-frequency nanoflares
• The Width Distribution of Loops and Strands in the Solar Corona -- Are we Hitting Rock Bottom ?
• Inference of Heating Properties from "Hot" Non-flaring Plasmas in Active Region Cores I. Single Nanoflares
• Simulations of Solar Jets Confined by Coronal Loops
• Is the High-Resolution Coronal Imager Resolving Coronal Strands? Results from AR 12712
• Can the Differential Emission Measure constrain the timescale of energy deposition
• To what extent can dynamical models describe statistical features of turbulent flows?
• Filament Channel Formation Via Magnetic Helicity Condensation
• Inference of Heating Properties from "Hot" Non-flaring Plasmas in Active Region Cores. II. Nanoflare Trains
• A Model for Energy Buildup and Eruption Onset in Coronal Mass Ejections
• Patterns of Activity in a Global Model of a Solar Active Region
• The Evolution of the EM Distribution in the Core of an Active Region
• Power-Law Statistics Of Driven Reconnection In The Magnetically Closed Corona
• The Role of Magnetic Helicity in Structuring the Solar Corona
• The Mechanism for the Energy Buildup Driving Solar Eruptive Events
• 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
• Identification of coronal heating events in 3D simulations
• The Role of Magnetic Helicity in Coronal Heating
• Coronal Heating Topology: the Interplay of Current Sheets and Magnetic Field Lines
• Equilibria, Dynamics and Current Sheets Formation in Magnetically Confined Coronae
• Investigating 4D Coronal Heating Events In MHD Simulations
• Spatiotemporal organization of energy release events in the quiet solar corona
• Sparse Bayesian Inference and the Temperature Structure of the Solar Corona

Cited by in corpus (1)

• Modeling of Condensations in Coronal Loops Produced by Impulsive Heating