publication . Preprint . Article . 2016

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;
Open Access English
  • Published: 19 Oct 2016
Abstract
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 challenging. Using an efficient two-fluid hydrodynamic model, this paper investigates the properties of the emission expected from repeating nanoflares (a nanoflare train) of varying frequency as well as the separate heating of electrons and ions. If the emission measure distribution ($\mathrm{EM}(T)$) peaks at $T = T_m$, we find that $\mathrm{EM}(T_m)$ is independent of details of the nanoflare train, and $\mathrm{EM}(T)$ above and below $T_m$ reflects different aspects of the heating. Belo...
Subjects
arXiv: Physics::Space PhysicsAstrophysics::Solar and Stellar Astrophysics
free text keywords: Hydrodynamics, Plasmas, corona [Sun], QB Astronomy, QC Physics, DAS, QB, QC, Astrophysics - Solar and Stellar Astrophysics, Science & Technology, Physical Sciences, Astronomy & Astrophysics, Sun: corona, EMISSION MEASURE DISTRIBUTIONS, X-RAY OBSERVATIONS, TEMPERATURE-EMISSION, STELLAR CORONAE, TIME-DEPENDENCE, SOLAR CORONA, HINODE, DENSITY, MODELS, LOOPS, 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural), Space and Planetary Science, Astronomy and Astrophysics, Inference, Astrophysics, Train, Physics, Cyberinfrastructure, Astronomy, Plasma, Corona
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Antiochos, S. K., & Sturrock, P. A. 1978, ApJ, 220, 1137

Barnes, W. T., Cargill, P. J., & Bradshaw, S. J. 2016, ApJ, 829, 31

Bradshaw, S. J. 2009, A&A, 502, 409

Bradshaw, S. J., & Cargill, P. J. 2006, A&A, 458, 987

|. 2013, ApJ, 770, 12

Bradshaw, S. J., Klimchuk, J. A., & Reep, J. W. 2012, ApJ, 758, 53

Brosius, J. W., Daw, A. N., & Rabin, D. M. 2014, ApJ, 790, 112

Cargill, P. 2013, Natur, 493, 485

Cargill, P. J. 1994, ApJ, 422, 381

|. 2014, ApJ, 784, 49

Cargill, P. J., Bradshaw, S. J., & Klimchuk, J. A. 2012a, ApJ, 752, 161

|. 2012b, ApJ, 758, 5

Cargill, P. J., & Klimchuk, J. A. 2004, ApJ, 605, 911

|. 2006, ApJ, 643, 438

Cargill, P. J., Warren, H. P., & Bradshaw, S. J. 2015, RSPTA, 373, 20140260

60 references, page 1 of 4
Abstract
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 challenging. Using an efficient two-fluid hydrodynamic model, this paper investigates the properties of the emission expected from repeating nanoflares (a nanoflare train) of varying frequency as well as the separate heating of electrons and ions. If the emission measure distribution ($\mathrm{EM}(T)$) peaks at $T = T_m$, we find that $\mathrm{EM}(T_m)$ is independent of details of the nanoflare train, and $\mathrm{EM}(T)$ above and below $T_m$ reflects different aspects of the heating. Belo...
Subjects
arXiv: Physics::Space PhysicsAstrophysics::Solar and Stellar Astrophysics
free text keywords: Hydrodynamics, Plasmas, corona [Sun], QB Astronomy, QC Physics, DAS, QB, QC, Astrophysics - Solar and Stellar Astrophysics, Science & Technology, Physical Sciences, Astronomy & Astrophysics, Sun: corona, EMISSION MEASURE DISTRIBUTIONS, X-RAY OBSERVATIONS, TEMPERATURE-EMISSION, STELLAR CORONAE, TIME-DEPENDENCE, SOLAR CORONA, HINODE, DENSITY, MODELS, LOOPS, 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural), Space and Planetary Science, Astronomy and Astrophysics, Inference, Astrophysics, Train, Physics, Cyberinfrastructure, Astronomy, Plasma, Corona
60 references, page 1 of 4

Antiochos, S. K., & Sturrock, P. A. 1978, ApJ, 220, 1137

Barnes, W. T., Cargill, P. J., & Bradshaw, S. J. 2016, ApJ, 829, 31

Bradshaw, S. J. 2009, A&A, 502, 409

Bradshaw, S. J., & Cargill, P. J. 2006, A&A, 458, 987

|. 2013, ApJ, 770, 12

Bradshaw, S. J., Klimchuk, J. A., & Reep, J. W. 2012, ApJ, 758, 53

Brosius, J. W., Daw, A. N., & Rabin, D. M. 2014, ApJ, 790, 112

Cargill, P. 2013, Natur, 493, 485

Cargill, P. J. 1994, ApJ, 422, 381

|. 2014, ApJ, 784, 49

Cargill, P. J., Bradshaw, S. J., & Klimchuk, J. A. 2012a, ApJ, 752, 161

|. 2012b, ApJ, 758, 5

Cargill, P. J., & Klimchuk, J. A. 2004, ApJ, 605, 911

|. 2006, ApJ, 643, 438

Cargill, P. J., Warren, H. P., & Bradshaw, S. J. 2015, RSPTA, 373, 20140260

60 references, page 1 of 4
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publication . Preprint . Article . 2016

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;