The Aurora Alarm
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Walla Walla, WA
46.0° N, 118.2° W
Year: Month:

Understanding the Data

Note that the data is always displayed as a function of Universal Time, formerly known as Greenwich Mean Time. (If you are serious about observing the aurora or any other celestial event, you must become proficient at converting between your local time and UT.) All telemetry channels are uncalibrated, with arbitrary units on the vertical axis.

The curve of greatest interest on the plots is the blue one. This is a measure of how much green light from the aurora is falling on the detector. If it climbs above the dashed, light blue alarm threshold line for long, an alarm will be triggered and further values will be plotted in yellow instead of blue. The threshold line is adjusted up or down by the contributions of twilight and moonlight to the background sky brightness.


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Last modified 3 January 2004 by haunmarabbitketeuaardvarkorg replace animals with punctuation