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Updating Townsends snow model references #2384

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9 changes: 6 additions & 3 deletions pvlib/snow.py
Original file line number Diff line number Diff line change
Expand Up @@ -278,16 +278,19 @@ def loss_townsend(snow_total, snow_events, surface_tilt, relative_humidity,
axis to the module edge.

The parameter `string_factor` is an enhancement added to the model after
publication of [1]_ per private communication with the model's author. The
definition for snow events documented above is also based on private
communication with the model's author.
publication of [1]_, as described in [2]_,
The defination for snow events documented above is based on [3]_.

References
----------
.. [1] Townsend, Tim & Powers, Loren. (2011). Photovoltaics and snow: An
update from two winters of measurements in the SIERRA. 37th IEEE
Photovoltaic Specialists Conference, Seattle, WA, USA.
:doi:`10.1109/PVSC.2011.6186627`
.. [2] Townsend, T. (2025). Snow Loss Model Enhancements.
Available at: https://www.nrel.gov/docs/fy25osti/90585.pdf
.. [3] Townsend, T. (2025). Snow Events Definition.
DOI: 10.13140/RG.2.2.14299.68647
'''

# unit conversions from cm and m to in, from C to K, and from % to fraction
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