GONG Duty Cycle

On November 28, 2022, the volcanic eruption shut down the NSF's GONG station at Mauna Loa, Hawai'i. Since then, GONG operated as 5-station network. It was designed as 6-station network because of helioseismology requirements of high duty cycle (fraction of 24-hour day with solar observations). The plot shows the duty cycle through April 2025. GONG still meets the helioseismology requirements, but one can clearly see a drop in the duty cycle at the end of 2022 from about 95% to 85-90%. The plan is to restart GONG station at Mauna Loa by the end of this year, after the road access and the electric power are restored.