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.. _ebtelplusplus-comparison: | ||
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Why ebtelplusplus? | ||
====================== | ||
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For various historical reasons, there are multiple software implementations of the EBTEL model. | ||
There are currently *three* maintained implementations of the model as described below. | ||
Hereafter, "EBTEL" refers to the model generally while each software implementation is given | ||
its own unique name (e.g. ``ebtelplusplus``). | ||
This page briefly explains the differences between each implementation and the advantages of | ||
the ``ebtelplusplus`` implementation. | ||
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The table below summarizes the comparison of the different EBTEL software implementations and the different features provided by each. | ||
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.. list-table:: | ||
:header-rows: 1 | ||
:align: center | ||
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* - Feature | ||
- Citation | ||
- |EBTEL-IDL|_ | ||
- ``ebtel++`` | ||
- |EBTEL3-IDL|_ | ||
* - Decouple electrons and ions | ||
- :cite:t:`barnes_inference_2016` | ||
- :octicon:`x;1em;sd-text-danger` | ||
- :octicon:`check;1em;sd-text-success` | ||
- :octicon:`x;1em;sd-text-danger` | ||
* - Adaptive time step | ||
- :cite:t:`barnes_inference_2016` | ||
- :octicon:`x;1em;sd-text-danger` | ||
- :octicon:`check;1em;sd-text-success` | ||
- :octicon:`check;1em;sd-text-success` | ||
* - Area expansion | ||
- :cite:t:`cargill_static_2022` | ||
- :octicon:`check;1em;sd-text-success` | ||
- :octicon:`check;1em;sd-text-success` | ||
- :octicon:`x;1em;sd-text-danger` | ||
* - Supersonic flows | ||
- :cite:t:`rajhans_flows_2022` | ||
- :octicon:`x;1em;sd-text-danger` | ||
- :octicon:`x;1em;sd-text-danger` | ||
- :octicon:`check;1em;sd-text-success` | ||
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``EBTEL-IDL`` | ||
------------- | ||
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The original software implementation of EBTEL was in the Interactive Data Language (IDL) and | ||
was based off of the model presented in :cite:t:`klimchuk_highly_2008`. | ||
Subsequent improvements in :cite:t:`cargill_enthalpy-based_2012` were made to give better | ||
agreement with spatially-resolved hydrodynamic models. | ||
These improvements were also implemented in IDL. | ||
This version is sometimes referred to as "EBTEL2". | ||
:cite:t:`cargill_static_2022` extended the EBTEL model to include effects due to cross-sectional | ||
area expansion and implemented this in IDL as well. | ||
The IDL software implementation which includes all of these features is referred to as |EBTEL-IDL|_. | ||
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``ebtelplusplus`` | ||
----------------- | ||
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:cite:t:`barnes_inference_2016` improved upon the implementation of :cite:t:`cargill_enthalpy-based_2012` | ||
by extending the treatment to the two-fluid hydrodynamic equations, allowing for differential heating | ||
between electrons and ions. | ||
They also introduced a slightly modified approach for calculating the the :math:`c_1`` parameter during | ||
the conductive cooling phase :cite:p:`{see Appendix A of}barnes_inference_2016`. | ||
Modifications to include area expansion in the manner of :cite:t:`cargill_static_2022` were subsequently added. | ||
Furthermore, the resulting equations are solved using a Runge-Kutta Cash-Karp integration method | ||
:cite:p:`{see section 16.2 of}press_numerical_1992` and an (optional) adaptive time-stepping technique | ||
to ensure the principal physical timescales are resolved at each phase of the loop evolution. | ||
The software implementation of this version of the model is referred to as ``ebtelplusplus`` (or ``ebtel++``). | ||
The majority of the software is implemented in C++ for computational efficiency and is wrapped in Python | ||
to enable easy installation and a user-friendly API. | ||
This is the implementation provided by this software package. | ||
``ebtelplusplus`` has been benchmarked against both |EBTEL-IDL|_ as well as more advanced field-aligned | ||
hydrodynamic models :cite:p:`barnes_inference_2016`. | ||
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``EBTEL3-IDL`` | ||
-------------- | ||
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:cite:t:`rajhans_flows_2022` built upon the model of :cite:t:`cargill_enthalpy-based_2012` and relaxed | ||
the assumption of subsonic flows in EBTEL. | ||
Additionally the Mach numbers and velocities produced are in better agreement with field-aligned | ||
hydrodynamic simulations. | ||
The IDL software implementation of this model is referred to as |EBTEL3-IDL|_. | ||
|EBTEL3-IDL|_ uses an adaptive time grid to ensure the appropriate timescales are resolved in the | ||
impulsive phase. | ||
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.. |EBTEL-IDL| replace:: ``EBTEL-IDL`` | ||
.. _EBTEL-IDL: https://github.com/rice-solar-physics/EBTEL | ||
.. |EBTEL3-IDL| replace:: ``EBTEL3-IDL`` | ||
.. _EBTEL3-IDL: https://github.com/rice-solar-physics/EBTEL3 |
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