Many thanks to the Taxpayers of France, the Nancay Decametric Array Team at the Nancay Radio Astronomy Station of Paris Observatory, Trinity College Dublin Ireland Astrophysics Group, NOAA SWPC, and NASA SDO HMI Magnetograph Team.
The vertical scale is hours and minutes of Universal Time
The horizontal scale is MHz
The dynamic range from black to white is 20 decibel in 5 spectra below
The dynamic range from black to white is 30 decibel below