GONG Network Window Function

Last week, NISP Data Center has been working on re-instating the GONG network window function monthly plots that were generated and discontinued a few years ago. Once completed, the window function plots would be available at https://gong.nso.edu/data/merged/gong+_merged_plots.html. Example of old-format window function for the month of April, 2026 is shown below. For each day of the month, red-colored bars represent periods with network observations. Gaps shown in the white color are periods without observations. The impact of missing observations from GONG at Mauna Loa observatory is clearly visible as larger data gaps in late (20-24 UT)  and early (0-4 UT) periods of the day. Numbers of the right side of the plot show average daily duty cycle (% of 24 hour period with observations). Even with one station down, the network still meets the required duty cycle.