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.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
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.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_examples_individual_options_plot_option_04_asymmetric_annual.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_examples_individual_options_plot_option_04_asymmetric_annual.py:


04. MSIS Option 4: Asymmetric Annual
====================================

This example demonstrates the analysis of MSIS Option 4,
which controls Asymmetric annual variations. This option represents a key
physical process that affects atmospheric density variations.

Understanding how this option affects atmospheric structure is important for
atmospheric modeling, satellite operations, and space weather applications.

.. GENERATED FROM PYTHON SOURCE LINES 12-17

.. code-block:: Python


    import matplotlib.pyplot as plt
    from msis_options_utils import create_option_analysis_figure









.. GENERATED FROM PYTHON SOURCE LINES 18-30

Option 4 controls Asymmetric annual variations
==============================================

This atmospheric effect includes:

* Hemisphere-dependent seasonal effects
* Asymmetric seasonal atmospheric responses
* North-south hemisphere seasonal differences
* Latitude-dependent annual variations

This analysis shows how turning OFF this option affects atmospheric density
across different dimensions and conditions.

.. GENERATED FROM PYTHON SOURCE LINES 30-36

.. code-block:: Python


    option_index = 4
    option_name = "Asymmetric Annual"

    fig = create_option_analysis_figure(option_index, option_name)




.. image-sg:: /examples/individual_options/images/sphx_glr_plot_option_04_asymmetric_annual_001.png
   :alt: Comprehensive Analysis: MSIS Asymmetric Annual Option Atmospheric density changes when option is turned OFF F10.7=180, Ap=15, A) Altitude Profiles, B) Geographic Pattern at 300 km, C) Diurnal Cycle at 45°N, 300 km, D) Seasonal Cycle at 45°N, 300 km
   :srcset: /examples/individual_options/images/sphx_glr_plot_option_04_asymmetric_annual_001.png
   :class: sphx-glr-single-img





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Understanding the Results
=========================

**Panel A (Altitude Profiles)**: Shows how this effect varies with altitude
and between different seasonal and diurnal conditions. Look for differences
between the four curves to understand temporal variability.

**Panel B (Geographic Map)**: Reveals the global pattern of this atmospheric
effect. The contour plot shows percentage changes when the option is turned OFF
compared to the baseline (all options ON).

**Panel C (Diurnal Cycle)**: Demonstrates how this effect varies throughout
a 24-hour period at a fixed location (45°N, 0°E, 300 km altitude).

**Panel D (Seasonal Cycle)**: Shows how the strength of this effect
varies throughout the year, revealing seasonal dependencies.

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.. code-block:: Python


    plt.show()








.. GENERATED FROM PYTHON SOURCE LINES 57-70

Physical Importance
===================

This atmospheric effect is important because:

* Models hemisphere-specific seasonal differences
* Important for accurate polar region modeling
* Captures asymmetric seasonal atmospheric responses
* Essential for global atmospheric accuracy

When this option is turned OFF, these physical processes are removed
from the atmospheric model, which can significantly impact the accuracy
of density predictions depending on the specific application and conditions.


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.763 seconds)


.. _sphx_glr_download_examples_individual_options_plot_option_04_asymmetric_annual.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: plot_option_04_asymmetric_annual.ipynb <plot_option_04_asymmetric_annual.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: plot_option_04_asymmetric_annual.py <plot_option_04_asymmetric_annual.py>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: plot_option_04_asymmetric_annual.zip <plot_option_04_asymmetric_annual.zip>`


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