• Relative humidity
• Wind speed
• Net radiation
The net radiation data, if missing, can be estimated based on global radiation, temperature and humidity,
calculation date/time (for solar position evaluation).
The calculation is performed on a daily basis, the type of calculation on a monthly basis is not supported (only
one data per month). The daily activation of the calculation determines the extraction of the data of the
previous day (as they are considered to be completely present). The data extracted are:
• Minimum and maximum temperature values.
• Minimum and maximum relative humidity values.
• Mean value of net or global radiation.
• Average value of wind speed.
To access the configuration:
1. From section Extensions, select
Calculation Modules.
2. Select Penman-Monteith evapo-
transpiration calculation and press
[Edit].
3. Set Enable Penman-Monteith
elaboration to Yes. Then proceed to the
compilation of the required fields
according to the measures available on
the data logger.
The elaboration results are stored in a specific file in ASCII text format (§4.2.6) and sent to remote reception
systems, as already provided for statistical elaborated data normally produced by the data logger.
4.2.3.5 Pasquill-Gifford atmospheric stability class
The Pasquill-Gifford atmospheric stability classes are a method for classifying atmospheric stability. It is
divided into six categories named with the letters from A to F in which the first indicates strong in-stability
and the last more stability as indicated in the following table:
Moderately or strong stability
There are several methods for calculating the stability classes. Alpha-Log implements that based on global
radiation and vertical temperature gradient. It is based on the following table:
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