Cloud Coverage - PEGASUSASTRO Uranus Meteo Sensor Product Manual

Uranus Meteo Sensor
8.2

CLOUD COVERAGE

In order to determine the cloud coverage, you need to calculate the Sky temperature.
The actual sky temperature can be calculated by subtracting the ambient temperature
from the infrared measured temperature.
Clouds reflect the infrared radiation of the ground back to earth, The lower the
difference in Ground vs Sky temperature, the more the clouds in the sky. If difference
is high, then this is a sign that the infrared radiation is not reflecting back to earth.
Lots of factors affect the actual sky temperature. Your geographical longitude, the
ambient temperature and conditions in troposphere will shift the sky temperature so
a correction model is automatically applied by the Uranus device.
One of the most important factors is the ambient temperature which is taken in
consideration from the device and adjusts the actual temperature sky readout. The
temperature difference in cold vs hot climates (or winter vs summer) plays a
significant role in the calculation and makes this crucial to determine if sky is clear or
has spare clouds.
Page 35 of 38
Pegasus Astro - Uranus Meteo Sensor Manual