142 citations · 717 across the 22 of their papers we have counts for
17 papers · 1 filter
Direct calculation of steady-state hydrodynamic solar wind solutions with newtonian viscosity
Roger B. Scott, Stephen J. Bradshaw, Mark G. Linton +2
Steady-state solutions to the Navier-Stokes equations are known to admit solutions that are singular at the sonic point. Consequently, inviscid solar wind models require special tr…
Simulation of Thermal Nonequilibrium Cycles in the Solar Wind
Roger B. Scott, Jeffrey W. Reep, Mark G. Linton +1
Thermal nonequilibrium (TNE) is a condition of the plasma in the solar corona in which the local rate of energy loss due to radiation increases to the point that it cannot be susta…
Modeling Realistic Heating Profiles of Transition Region Hot Loops on the Sun: Evidence for Impulsive Heating and Non-equilibrium Ionization
Shah Mohammad Bahauddin, Stephen J Bradshaw
The study examines the heating profile of hot solar transition region loops, particularly focusing on transient brightenings observed in IRIS 1400Å slit-jaw images. The findings ch…
Determining the nanoflare heating frequency of an X-ray Bright Point observed by MaGIXS
Biswajit Mondal, P. S. Athiray, Amy R. Winebarger +18
Nanoflares are thought to be one of the prime candidates that can heat the solar corona to its multi-million kelvin temperature. Individual nanoflares are difficult to detect with…
Modelling the solar transition region using an adaptive conduction method
C. D. Johnston, P. J. Cargill, A. W. Hood +3
Modelling the solar Transition Region with the use of an Adaptive Conduction (TRAC) method permits fast and accurate numerical solutions of the field-aligned hydrodynamic equations…
Understanding Heating in Active Region Cores through Machine Learning I. Numerical Modeling and Predicted Observables
W. T. Barnes, S. J. Bradshaw, N. M. Viall
To adequately constrain the frequency of energy deposition in active region cores in the solar corona, systematic comparisons between detailed models and observational data are nee…
A Fast and Accurate Method to Capture the Solar Corona/Transition Region Enthalpy Exchange
C. D. Johnston, S. J. Bradshaw
The brightness of the emission from coronal loops in the solar atmosphere is strongly dependent on the temperature and density of the confined plasma. After a release of energy, th…
Inference of Heating Properties from "Hot" Non-flaring Plasmas in Active Region Cores. II. Nanoflare Trains
W. T. Barnes, P. J. Cargill, S. J. Bradshaw
Despite its prediction over two decades ago, the detection of faint, high-temperature ("hot") emission due to nanoflare heating in non-flaring active region cores has proved challe…
Chromospheric Nanoflares as a Source of Coronal Plasma: II. Repeating Nanoflares
Stephen J. Bradshaw, James A. Klimchuk
The million degree plasma of the solar corona must be supplied by the underlying layers of the atmosphere. The mechanism and location of energy release, and the precise source of c…
On Sunspot and Starspot Lifetimes
Stephen J. Bradshaw, Patrick Hartigan
We consider the lifetimes of spots on the Sun and other stars from the standpoint of magnetic diffusion. While normal magnetic diffusivity predicts lifetimes of sunspots that are t…
On the sensitivity of the GOES flare classification to properties of the electron beam in the thick target model
Jeffrey Reep, Stephen Bradshaw, R. T. James McAteer
The collisional thick target model, wherein a large number of electrons are accelerated down a flaring loop, can be used to explain many observed properties of solar flares. In thi…
The Cooling of Coronal Plasmas. iv: Catastrophic Cooling of Loops
Peter J. Cargill, Stephen J. Bradshaw
We examine the radiative cooling of coronal loops and demonstrate that the recently identified catastrophic cooling (Reale and Landi, 2012) is due to the inability of a loop to sus…
The influence of numerical resolution on coronal density in hydrodynamic models of impulsive heating
Stephen J. Bradshaw, Peter J. Cargill
The effect of the numerical spatial resolution in models of the solar corona and corona / chromosphere interface is examined for impulsive heating over a range of magnitudes using…
Diagnosing the time-dependence of active region core heating from the emission measure: II. Nanoflare trains
Jeffrey W. Reep, Stephen J. Bradshaw, James A. Klimchuk
The time-dependence of heating in solar active regions can be studied by analyzing the slope of the emission measure distribution cool-ward of the peak. In a previous study we show…
Diagnosing the time-dependence of active region core heating from the emission measure: I. Low-frequency nanoflares
Stephen J. Bradshaw, James A. Klimchuk, Jeffrey W. Reep
Observational measurements of active region emission measures contain clues to the time-dependence of the underlying heating mechanism. A strongly non-linear scaling of the emissio…
Enthalpy-based Thermal Evolution of Loops: II. Improvements to the Model
Peter J. Cargill, Stephen J. Bradshaw, James A. Klimchuk
This paper develops the zero-dimensional (0D) hydrodynamic coronal loop model "Enthalpy-based Thermal Evolution of Loops" (EBTEL) proposed by Klimchuk et al (2008), which studies t…
Slow shocks and conduction fronts from Petschek reconnection of skewed magnetic fields: two-fluid effects
D. W. Longcope, S. J. Bradshaw
In models of fast magnetic reconnection, flux transfer occurs within a small portion of a current sheet triggering stored magnetic energy to be thermalized by shocks. When the init…