GONG low duty cycle (updated on 4/4/2026)

GONG network is operating at a very low duty cycle (see plot attached) due to three adjacent stations  down: GONG/Mauna Loa - in aftermath of volcanic eruption, GONG/Big Bear - preventive maintenance trip, and GONG/Learmonth - damages in aftermath of the tropical cyclone (TC) Narelle.

The LE GONG station was shut down on March 25th in anticipation of the arrival of Tropical Cyclone Narelle. TC Narelle caused significant damage to Exmouth and Learmonth, but there is no damage to GONG/Learmonth station itself, except for one air-conditioning units, and some external access power panels. After the electrician inspection, the power to GONG was restored, and the instrument may have resumed observations. However, there is no internet access and thus, data are stored on the site. 

NISP engineering team are performing preventive maintenance work at GONG/Big Bear. It is expected that GONG/BB will be back to operations on 4/4/2026. UPDATED on 4/4/2026: The preventive maintenance was completed. GONG/Big Bear is back to full operations.

Primitive access road to Mauna Loa is completed, but access is still limited. NISP team plans visiting the site for the evaluation of restart activities after the commercial power to the site is restored.