National Solar Observatory
@NatSolarObs
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The mission of the National Solar Observatory is to advance knowledge of the Sun, both as an astronomical object and as the dominant external influence on Earth
Joined May 2016
☀️ Ka Lā | The Sun, the Earth and Us 🌍 We’re proud to share a new @NSF documentary filmed on Haleakalā, Maui! Discover our timeless connection to the Sun and the groundbreaking science at the NSF Inouye Solar Telescope🎬: https://t.co/bHytc60Bc1
#NSFfunded #InouyeSolarTelescope
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🔆🦺 Safety first, science always! At the @NSF Inouye Solar Telescope, safety is the foundation for groundbreaking solar discoveries. Thank you Gary for leading our safety team and keeping us safe every day! Full video: https://t.co/QHdNuLgxp6
@DiscoveryEd @SesameWorkshop
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Helioseismic maps of the far side show several moderate-sized active regions; some have persisted and show a high likelihood of rotating into view on the front side. Active region 14238 from the previous Carrington rotation is expected to reappear on the front side around Oct 18
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This region also produced several low-intensity C-class flares on Oct 12. The first CME is anticipated to arrive on Oct 15, followed by the second on Oct 16.
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Solar Activity Report: Oct 6–12, 2025☀️ Activity remained generally low this week, with several low-intensity C-class flares and one M-class event. The most significant, an M2.0 flare, occurred on Oct 9 from active region 14236 near the west limb in the northern hemisphere.
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What is a telescope dome? 🔭 Join Bella & Lono as they explore the @NSF Inouye Solar Telescope with Paul Jeffers, Technical Operations Manager at the NSO! Watch the full @DiscoveryEd Virtual Field Trip: https://t.co/5wOgTasJbQ
@SesameWorkshop
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In May, @NSF NSO & @NJIT unveiled the clearest-ever images of plasma in the Sun’s corona using Cona—the world’s first coronal adaptive optics system. NOW, 80+ high-res observations are publicly available: prominences, coronal rain, spicules & more! https://t.co/6O0FOSIzc0
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Additionally, some of the active regions from a cluster that recently crossed the western limb may reappear on the Earth-facing side around Oct 18. Data from @NSF GONG, operated by the NSO. Credits: Jain/Williams/NSF/GONG/NSO/AURA with contributions by NOAA #NSFfunded
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Helioseismic imaging of the Sun's far side reveals several active regions, many previously visible on the Earth-facing side but have since rotated out of view. A large active region in the southern hemisphere is expected to emerge near the eastern limb around Oct 11.
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On Oct 3, two slow-moving, Earth-directed coronal mass ejections (CMEs) were observed. NOAA forecasts both CMEs to arrive after midday on Oct 7.
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Solar Activity Report: Sep 29–Oct 4, 2025 🌞 Activity began at moderate levels with multiple M- and C-class flares, tapering to low levels by week’s end. Twelve M-class flares were recorded (five from Active Region 4232). This region produced the strongest—an M3.6 flare on Sep 29
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📸: CTIO/NOIRLab/NSF/AURA/H. Tirado/E. Parkes and NSO.
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#30YearsOfGONG: The @NSF GONG station at Cerro Tololo in Chile (@NOIRLabAstro CTIO) celebrates 30 years of solar monitoring! This achievement reflects the collaboration of NSO teams and the full CTIO staff, with key members like Esteban Parkes (pic #2-3) & Hernán Tirado (pic #4).
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🌞 Fun in the Sun! NSO joined the community at Boulder’s Festival Del Sol, setting up solar telescopes for safe, close-up views of our star 🔭 This free bilingual festival celebrated culture and community with music, food & family fun—perfect for sharing solar science!
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At present, helioseismic imaging does not indicate any other significant magnetic activity on the Sun’s backside. Data by @NSF GONG, operated by the NSO. Additional Credits: Jain/Williams/NSF/GONG/NSO/AURA with contributions by NOAA. #NSFfunded #SpaceWeather
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Several CMEs were observed near or beyond the eastern limb, but none were Earth-directed. A cluster of active regions in the southern hemisphere has crossed the western limb and is now on the far side of the Sun. Some of these regions may rotate back into view around Oct 12.
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By midweek, conditions briefly returned to low levels before rising again the following day and remaining moderate through the weekend. 59 C-class and 8 M-class flares were recorded, with the most intense event—a powerful M6.4 flare—originating from Region 14232 on Sep 28.
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Solar Activity Report: Sept 22-28, 2025 Solar activity fluctuated between low and moderate levels throughout the week. The week began quietly, marked by low C-class flares. Activity then intensified, reaching moderate levels with several high C-class and M-class flares. 🧵
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🚨 Big news! The @NSF National Solar Observatory will design ngGONG, the Next-Generation Solar Observing Network, with NSF funding! This global network would advance solar science & space-weather forecasting, replacing the long-serving GONG stations. https://t.co/KWWJW72j9q
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