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thanks, Patch. <br>
<br>
A lot of the high readings occur when the hikers would likely have been
in the high Sierra. There, at high elevation in bright sunshine, I'm
guessing air temps would top out somewhere in the 70's or low 80's. I
doubt it would feel like 115, and certainly not 140. That's because
even though the sun would be intense, you'd likely be wearing loose
fitting white or light colored clothing, so the sun's radiation would
be mostly reflected AND you'd get the benefit of the relatively cool
air moving around you. Inside a dark colored pack, near the pack
surface, with no air circulation, you would have much higher temps.<br>
<br>
But other than those abnormally high data points, the other data should
be close to what the hikers were experiencing. Certainly night
readings and early morning readings would be accurate.<br>
<br>
Are you planning to continue gathering data in the future?<br>
<br>
Greg<br>
<br>
Michael Lissner wrote:
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Yeah, I didn't think it would be practical to really bother with
careful consideration of the device during the entirety of the
journey....so I can't speak for the other hikers. I know one of them
carried it near the bottom of his pack, and I believe another carried
it in his ditty bag, which was on the outside of his pack.<br>
<br>
I can speak for my own iButton. Before leaving, I sewed it into my pack
beneath one layer of white silnylon, and there it lived for the entire
trip.<br>
<br>
I have attributed the high readings as desert ground temperatures, but
you're probably right that solar gain has more to do with it.<br>
<br>
In any event, if that is the case, that's a better representation of
the way it feels anyway, right?<br>
<br>
-patch<br>
<br>
Greg Kesselring wrote:
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Very cool. This is a great data source.<br>
<br>
I just looked at your website and you mention that the temp readings
were taken from at device that was carried INSIDE your backpack? If
deep inside, then there would be a considerable delay in temperature
transfer from the air to the device due to the material inside the pack
acting as insulation. If near the surface of the pack, you might get
higher readings due to passive solar gain, especially if the pack was a
dark color. I noticed a couple of 140 degree readings which would
likely have been due to this effect.<br>
<br>
Did you give any instructions to the hikers about where to place the
devices? <br>
<br>
Greg<br>
<br>
D</blockquote>
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