GONG data processing update

 Processing of the network-merged daily velocity and magnetogram images,  p-mode-coefficient time series, and ring-diagram analysis products for GONG month 312,  and  the  p-mode frequency data products for central GONG month 311 is completed and the data products are now available.

Solar Activity Report: April 27 - May 3, 2026

Solar activity during the reporting week remained generally low, with X‑ray flux staying within the low C‑class range aside from a few high‑C and low M‑class events. Activity briefly rose to moderate levels on the first two days: an M1.0 flare from active region 11425 on April 27, followed by three low M‑class flares and several high C‑class flares, including C8.1, C9.0, and C9.3, from the active region 11420 on April 28. Consequently, April 28 was the most active day of the week, and the strongest event was an M1.5 flare from active region 11420. This region also produced a C7.4 flare on May 1 and a C8.7 flare on May 2. No significant Earth‑directed CMEs were detected in coronagraph observations.

The latest helioseismic far‑side map suggests that a moderate to strong active region may rotate onto the north‑east limb around May 9.

Poster presentations by NISP personnel at the 2026 Space Weather meeting in Boulder, CO.

The 2026 Space Weather meeting took place in Boulder, Colorado on 28 April- 1 May, 2026. NISP personnel presented several posters during this meeting relevant to Space Weather research and operational forecast. The presentations included: 

• "VSO 2.0 and Space Weather" by N. Oien et al
• "Full-disk Hα Spectroheliograph development for GONG: Preliminary results" by S. Gosain et al.
• "Limb-Flare Prediction (and...beyond-limb flare prediction) with a 4π Full-Heliosphere Forecasting Framework" by K.D. Leka et al.
• "Polarity-Resolved Magnetograms Derived from GONG Far-Side Helioseismic Maps for Space Weather Applications" by Hamada, A. et al.

More poster references will be added later. 

Solar Activity Report: April 20 -26, 2026

Solar activity ranged from very low to high levels during the reporting period. Activity was very low at the start of the week, with X‑ray flux in the mid‑B-class range, before increasing to the upper B‑class level accompanied by frequent low‑ to mid‑C‑class flares. By early April 23, activity rose sharply, producing four M‑class flares that day. Activity intensified further on April 24 with two X‑class flares (X2.5 and X2.4) and two additional M‑class flares. Finally, the solar activity subsided on April 25 and continued with the similar conditions on April 26, although the X‑ray flux remained in the C‑class range with a few M‑class events. These flares were associated with CMEs, however, none of which had Earth‑directed components.

GONG UD is back on-line

 GONG station in Udaipur, India is back to operations.  NISP team worked with the site support group in India to run series of tests, which identified a failed electronic board. The board was replaced by a spare, and the system's operability was restored. The images error was cleared, and the PM (preventive maintenance) flag is turned off.  H-alpha image of the Sun taken after the repairs is shown below.

 

Solar Activity Report: April 13 - 19, 2026

Solar activity remained at low levels during the reporting period. X‑ray flux was predominantly within the B‑class range, with only occasional short‑lived increases into the C‑class. Active region 14419 was the dominant contributor, responsible for five of the seven C‑class flares recorded, including the strongest event of the week, a C4.1 flare on April 17. Additional low‑level C‑class flares were observed on April 13, 16, 17, and 18, while the remainder of the week stayed within the B‑class range. A few CMEs were detected, none with Earth‑directed components.

GONG network status

As of 18 April: 

• The Learmonth instrument is operational, and the sky is clear. 
• The Udaipur instrument is operational, and the sky is clear. On April 19, the Camera Rotator stopped rotating. Local support team was requested to check if the Camera Rotator amplifier may have a blown fuse. The observations are taken, but the image orientation is not correct (see images below taken on 18 and 19 April). UPDATE: on 20 April, GONG/UD was put into PM mode (no observations are taken) while the team is resolving the issues with oscillations in the camera rotator and the turret. 
• In early April, the internet connectivity at Udaipur experienced some instability. This was traced to a piece of cable chewed by the panther. This piece of cable was now replaced.
• The El Teide instrument is operational, and the sky is mostly cloudy.
• The Cerro Tololo instrument is operational, and the sky is clear.
• The Big Bear instrument is operational, and the sky is partly cloudy.
• The Mauna Loa instrument is down.
• Two engineering sites in Boulder, Colorado (TC and TE) are down for testing.