Ionograms from Lualualei on Oahu
The Ionograms posted by the US Navy on Oahu are undoubtedly our best source of information about current local ionospheric conditions.
1 - Click the List of Recent Ionograms button & scroll to the bottom of the list.
2 - Open the latest (last) ionogram listed. (GMT/UTC Time)
3 - The foF2 and foF1 critical frequencies will be in the upper left corner.
4 - Compare them with the Statewide NVIS table below.