Strip chart, peak power LAST 10 MIN
Today's running data
Peak above noise floorGalactic plane in the beam
Predicted meridian crossingData gap
Spectrum
Waterfall NEWEST AT TOP
Hydrogen clouds in the beam FROM THE SPECTRUM
The Milky Way's hydrogen sits in separate clouds and spiral arms, each moving at its own speed. Moving gas shifts the 1420 MHz line slightly up or down (the Doppler effect), so each bump in the spectrum is one cloud, and its position tells you how fast it's moving toward or away from us. The page separates the bumps by fitting a smooth curve to each.
Historical peak power
Heat maps
Tsys, 30 days
Median system temperature each day. Drift means the receiver's gain is changing.
Nightly peak, 30 days
The day's highest peak, with the median line.
Sky coverage
Where the beam has recorded, in galactic coordinates. Brighter is more time.