Introduction Trip report Description of Kaashidhoo
INDOEX observatory and tower Description of Hulule and Male General information


INDOEX Observatory Tower

The Tower

Here are the first photos of the tower setup as we plan to ship it to the Maldives. The setup consists of the top tower segment (UPRIGHT scaffolding tower) including guard rail (about 3 m total height) and is currently operating on upper campus at UCSD, La Jolla, California, USA, collecting data for a local CARPOS campaign. You are looking at the north face of the tower slightly from the north-east. The small tray mounted to the north-side carries three unshaded instruments (clear-dome pyranometer, 695 µm filtered pyranometer, GTR-511 UV/VIS spectrometer).

The south-east corner of the platform carries the sun tracker with another set of three shaded instruments (clear-dome pyranometer, 695 µm filtered pyranometer, GTR-511 UV/VIS spectrometer). The tracker follows the sun year-round and shades the instruments with its three shading balls. Both sets of instruments operate at the same height and will be the highest instruments on the tower with an unobstructed view of 360°.
Sticking out to the west (right) is an arm carrying the meteorological instruments, most pronounced is the sonic anemometer (three-pronged instrument), with rain gauge, pressure, temperature and humidty sensors nearby. The top left (north-east) corner, where the diagonal brace ends, will carry the aerosol high-colume impactor inlet as well as the trace gas inlets.
To the right of the tower, you can see a tripod setup of other instruments that operate for our local CARPOS site. This tripod is slightly lower than the tower and will not be present in the Maldives.

This is another look at the setup from the south-west side. It gives a good look at the sun tracker pointing into the sun (which is behind the photographer). The ladder will ultimately be inside the frame, the tower platform has a walk-through hatch, which can be closed.

Here are some more impressions and close-ups of the instruments. This page will be updated with equivalent pictures of the final setup in the Maldives in January 1998.

This is a close-up of the sun tracker, the viewer is looking south, the sun is above to the right. By the way, the background image of this page is is a similar look right into the sun.

The next image is a look across the shaded instruments, looking almost due north, to the unshaded set of sensors. Note the air fans mounted to the bottom of the Kipp & Zonen CM-21 pyranometers. The air stream exits around the domes and helps to stabilize the dome temperatures and to keep dust away. The BSI GTR-511 UV-VIS spectrometer is mounted in an aluminum split-clamp (painted white) which can be leveled with three screws and is fixed with another 4 screws.
The tray with unshaded instruments in the back shows the black sensor head of an ASD 512 channel, grating spectrometer between the two left instruments. This sensor will run along with all other instruments during this CARPOS campaign, but will ultimately be used on board the Sagar Kanya during the 1998 INDOEX FFP.

Finally, here's a look across the unshaded sensors to the west, the ocean in the background. The ASD grating spectrometer sensor (black cylinder with white diffuser) is visible between the BSI GTR-511 and the red-dome pyranometer.
Slightly below and behind the tower are two more unshaded, clear-dome pyranometers (Eppley PSP) mounted to the top of the tripod (with four arms). On the very left arm of the tripod, we operate a YES UV MFRSR (multi filter rotating shadowband radiometer). This instrument will also be part of the INDOEX FFP in February and March, 1998. All other instruments shown are scheduled to operate for about 2 years.

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C4 - 19 October, 1997