Uploaded image
We watch activity move from band to band following changes in daytime and nighttime propagation. Here we look over a period of many days.
We leave the bands.html plugin running day and night. We snapshot the screen when we reconfigure SparkSDR radios leaving us two charts per day which we will save here and display in a gallery grid.
pages/spark-band-history
Click one image or click gallery for all.
See Spark Decodes for more scripts.
# Making
We follow this transition ritual each morning and evening in order to collect this record.
- Resize browser to full screen - Record plotly snapshot - See in Finder - Rename png with date - Move to activity folder - Upload to assets folder - Change SparkSDR presets - Reload bands.html script
The gallery.html script expects to find the images on this wiki page. It can also interpret directory listings from the deno standard file server. site 
deno run --allow-net --allow-read \ https://deno.land/std/http/file_server.ts
I sometimes forget to refresh the band.html tab so I get am and pm bands mixed together. I can clear out the now obsolete bands from the javascript console with splice:
data.splice(0,4)