CE318-T Photometer
User Operation Manual
Revision V4.10 October 2021
88
11.2. AERONET network (FAQ)
What is the AERONET network?
The AERONET (AErosol RObotic NETwork) program is a ground-based remote
sensing federation of networks established by NASA and PHOTONS. Data acquired
by all the photometers are gathered by the central system and a large number of quality
insured products are made available for public access.
How to enter it?
To enter the network, a request must be sent to AERONET.
See AERONET website: https://aeronet.gsfc.nasa.gov/ .
What to do when there is a “Bad sun tracking”?
If the photometer is declared in AERONET “bad sun tracking” warning flags may be
emitted. They will be emitted on this website:
http://aeronet.gsfc.nasa.gov/cgi-bin/weekly_report_v2
The possible causes that may lead to a bad sun tracking are:
• The sun spot is too far from the target after a GOSUN scenario (see step 11
and 16 in the installation part).
• The external battery is too low.
• The sensor head cord is damaged.
• The four quadrants sensor is too dirty.
• The four quadrants sensor is broken.
• The collimator is not correctly assembled to the sensor head.
• The collimator is deformed.
• The robot base is not horizontal.
Procedure to follow:
• Make sure that the sun spot after a GOSUN scenario is not too far away from
the target on the collimator.
• Check the battery voltage, it must be over 12V.
• Clean the four-quadrant sensor with a cotton swab.
• Check visually the external state of the sensor.
• Check if the collimator is correctly assembled.
• Check the spirit level.
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