Live Data

60 kHz WWVB and 24 kHz SID Receivers in Austin, Texas

Plots include data from yesterday and today. Check the time (select UTC, 24-hr) to see where the new data is being recorded. There is usually a noticeable discontinuity where the new data ends and the old data remains. Four traces  indicate that I had to restart the computer and two of the traces will clear in a day.

Points are plotted every 10 seconds for 24 hours and the chart is updated every 5 minutes. There are a total of 8,640 points on the graph. (See the new Dataq spreadsheet) 

Graph Date and Time:

(Based on your computer's clock. Chart displays yesterday's data after time above.)

Red: WWVB, 60 kHz, Magnetic (loopstick)
 Black: NAA, 24 kHz, Electric (roof-mounted whip)

The plot is from the newer Oddball Sid Receiver using a loopstick antenna and the SID Seizer using a roof-mounted whip. SIDs will cause spikes between about 12:00 and 0:00, where the plot is normally low. The high portion between 0:00 and 12:00 is nighttime sky wave. The width of the useful SID window is a function of the season, being longer in the summer.

To confirm a flare, see .  To investigate a possible Gamma Ray Burst (GRB), see

If the red trace drops to zero suddenly WWVB may have gone off the air; Check the NIST website to confirm. NAA is unpredictable.

These SID charts are most useful during the daylight hours. Below is a plot made on 10/25/2013, ending at 23:00. The plot between about 22:00 and the next day at about 12:00 is dominated by nighttime effects and is not very suitable for SID monitoring. Note the signal actually drops before it rises in the fall, winter and early spring here in Austin. That usually doesn't happen during the warmer months.

I'll post a few interesting captures here:

         Lots of "area under the curve!"

  This is about as quiet as the sun gets.

Note how well the SID plot tracks the
actual X-ray data.

Here's a weird series of flares 1 hour apart.
The bottom is NOAA data.

Super-Simple Infrasound Microphone

This spectrogram updated every 5 minutes (hit "refresh"). It displays 0 to 80 Hz. The vertical dotted lines are 5 minutes apart. This is an ordinary electret microphone in a jar with a styrofoam plug. The amplifier boosts the sensitivity below 10 Hz giving a useful response to below 1 Hz. See the "Better Microphone Preamplifier." (The response is reasonably flat to about 2 Hz but the characteristics of the local highway noise makes it look like it's rolling off around 10 Hz.)

Graph Produced by Spectrum Lab 

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