Warning: "Always use ISO-certified eclipse glasses or handheld solar viewers when observing the Sun to prevent serious eye damage. Regular sunglasses are not safe, and you should never look directly at the Sun without proper eye protection." For additional tips of how to view the Sun safely, please see https://eclipse.aas.org/eye-safety.
Processing of the network-merged daily velocity and magnetogram images, p-mode-coefficient time series, and ring-diagram analysis products for GONG month 316 covering the period 20260524 to 20260628, and the p-mode frequency data products for central GONG month 315 spanning 20260418 to 20260523 is completed and the data products are now available.
The impact of solar activity on our technological society was presented in many scientific publications and popular books (see, for example, "Storms from the Sun" by Michael J. Carlowicz and Ramon E. Lopez, Joseph Henry Press, 2003). Reports by the National Research Council (Baker et al. 2009) and the Lloyd’s Insurance company (Lloyd's 2013) indicated that extreme solar eruptions could cause catastrophic, multi-trillion (!) economic damages, with extended recovery time, not counting human costs (Oughton et al. (2017). The impact would affect a power distribution, transportation, communications, satellite infrastructure, aviation, and global positioning systems (Eastwood et al. 2017).
See recent CNN article by Kasha Patel and Sam Hart to learn "where a massive solar storm could take down the US power grid". Timely prediction of solar storms and their arrival time to Earth may help mitigating their impact. Observations from GONG stations play important role in such modeling.
Solar
activity varied from very low to medium levels during the reporting period.
Seven M‑class flares were recorded during the first three days, all originating
from active region 14513, followed by a gradual decline to low activity. Peak
activity occurred between midday August 24 and midday August 26, including the strongest event of
the week - an M6.9 flare on August 25. In addition, several
medium-to-high intensity flares were produced during this period. From August 27 onward, the Sun remained quiet,
producing only a few low‑intensity C‑class flares through August 30.
Far side
helioseismic maps reveal several active regions on the far hemisphere. While
most exhibit a low likelihood of appearing on the visible disk, an active
region (14507 from the previous Carrington
rotation) has a moderate probability of rotating onto the front side. Provided
it does not decay, it is expected to return to the Earth‑facing hemisphere on
September 4.
The data server of the NSO Integrated Synoptic Program (NISP), which provides access to GONG and SOLIS data, has been recently impacted by extensive web scraping activity. Subsequent security measures have greatly improved access; however, there are still periods where the scraping activity slows down significantly the access for all users including the operational space weather and the research communities. We are considering changes to the data access via user registration services, but as a temporary solution, the data center has implemented a IP-based priority access list for selected stakeholders. If you experience issues with accessing NISP data, please contact the data center at nispdata@nso.edu.
A large chromospheric filament was present in the solar Northern hemisphere for several days. First, it could be spotted on 24 August 2026, as a prominence above the Eastern limb. Full disk image taken by GONG/Learmonth (Australia) shows this filament (circled) at the start of 30 August 2026. Later that day, the filament became active, and it disappeared. Filament eruptions are commonly associated with the coronal mass ejections (CMEs), but the coronal observations from SOHO/LASCO and GOES-19/CCOR-1 do not show an indication of a CME associated with this filament disappearance. Nor there is an indication of a coronal blast wave in SDO/AIA observations (called Moreton wave, when observed in the chromosphere), which is another signature of a CME. Attached video shows the disappearance of this filament as observed throughout the day by GONG stations in Learmonth (Australia), Teide (Canary Islands), and Cerro Tololo (Chile). Video starts at about 00:00 UT, and it ends at 16:57 UT. Transition between the instrument/sites is clear from changes in quality of the video. To reduce the size of video, the cadence is reduced from 1 minute to 4 minutes. GONG images can be accessed via the instrument website.
GONG CT (Chile) station is back on line, and it produces great data! Starting at about 13:15 UT on 22 August, 2026, a small filament in the south-eastern solar hemisphere begun activating. Attached image shows location of the filament by a blue oval as observed by GONG/CT (Chile). Coronal images from SDO/AIA (right side of the figure) indicate some restructuring taking place in the location of filament. The filament erupted and disappeared from H-alpha images at about 20:38 UT. Coronagraphic images did not show any sign of a CME associated with this filament eruption. There were two small coronal holes located East and South of the eruption site, and their walls might have deflected the filament eruption. Small chromospheric brightennings briefly observed south of the filament after its eruption may indicate the material falling back to the surface. This evolution is shown in the attached video.
The solar activity continues decreasing as the Sun enters the declining phase of cycle 25. It may still produce large sunspots. One of such...
