Gio this from John Saxon (Australia) who was working on the ALSEP experimetns after the astronauts left them on the Moon (there was a Sun eclipse on august 6 71, a few days after they left the Moon, but the TV camera wasn't working anymore, yet some sensors caught the difference in temperature).
(This is the kind of story one can find on the net, years after they occured!

"I should share one of my best ALSEP tracking stories.
One of the nice things about the Manned Spaceflight Network ground equipment
was that we could decommutate the Telemetry, and display spacecraft (and
Astronaut) parameters on strip chart recorders and other devices.
After the excitement of the manned sections of the Apollo missions,
supporting the ALSEP packages could seem rather routine - so we often
checked temperatures, seismic activity, etc.
One quiet evening we noticed that one of the usually fairly dull
seismometers (which could be interesting when Astronauts were walking
nearby) was outputting apparently random short sine wave activity
superimposed on the background activity. These were obviously artificial
artefacts, but no-one on site could work out what might be causing them.
So I checked with the on duty ALSEP controller at Houston, who came up with
the answer immediately. "Oh - what you are seeing is the Mylar heat
insulation which is spread around the seismometer - the sun is just rising
in the lunar dawn at the site and the insulation is warming up and 'pinging'
as it changes shape". A bit like a biscuit tin lid when you flex it.
So that was an unintended temperature change sensor. Never saw it during an
eclipse though...
Cheers - JohnS"

Raoul