NASA Space Alerts
@NASASpaceAlerts • 1,188,324 subscribers
@NASA official notifications on cosmic activity in near-Earth space including solar events, asteroids, comets, and meteors.
Shorts
Videos
It’s #SunDay! Here’s your space weather report for the week of Aug 14 - 20: • 4 M-class flares • 3 C-class flares • 22 coronal mass ejections • 0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. All of this week’s M-class flares happened in the last two days of this reporting period. Their source is the active region AR14513, which appears as a bright cluster that rotates into view from the Sun’s eastern limb (left side) starting on the 19th, about 2:30 into this video. We’ll keep an eye on this busy active region as it moves into an Earth-facing position over the coming days. Related: New NASA-funded efforts to predict active regions before they emerge:
NASA Space Alerts30,599 次观看 • 11 天前
It’s #SunDay! Here’s your space weather report for the week of Aug 7 - 13: • 0 M-class flares • 1 C-class flare • 16 coronal mass ejections • 1 geomagnetic storm This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. It was a quite calm week on the Sun, with a moderate geomagnetic storm occurring on Aug. 8 after several coronal mass ejections arrived at Earth together. There was also a total solar eclipse on Aug. 12. How come SDO didn't see it? SDO follows a “geosynchronous” orbit, orbiting Earth at the same rate as Earth spins. The spacecraft effectively “hovers” over its ground station in White Sands, New Mexico. White Sands was outside of the eclipse’s path, so SDO didn’t see it. Visualize SDO’s orbit:
NASA Space Alerts45,895 次观看 • 18 天前
It’s #SunDay! Here’s your space weather report for the week of July 3 - July 9: • 1 X-class flare • 36 M-class flares • 3 C-class flares • 42 coronal mass ejections • 1 geomagnetic storm This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. The Sun celebrated the fourth of July with a big bang, emitting an intense X-class solar flare ( and a burst of M-class flares. You can see the show starting at about 0:49 in the video. Learn more about space weather:
NASA Space Alerts95,910 次观看 • 1 个月前
It’s #SunDay! Here’s your space weather report for the week of July 24 - July 30: • 3 M-class flares • 1 C-class flare • 31 coronal mass ejections • 0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. SDO remains in its Earth eclipse period, with daily “blackouts” as the spacecraft passes behind our planet, which will continue through Aug. 2. This week’s strongest flare, an M3.2-class eruption, appears at about 1:10 into the video as a brief flash in the middle of the Sun’s disk. Learn more about the Sun and space weather: Note: This week's video does not include imagery from July 30th due to a temporary issue with our data processing pipeline that is being resolved.
NASA Space Alerts45,535 次观看 • 1 个月前
It’s #SunDay! Here’s your space weather report for the week of July 17 - July 23: • 5 M-class flares • 2 C-class flares • 31 coronal mass ejections • 0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. It was a fairly calm week on the Sun as SDO’s daily Earth eclipses punctuate our view of the Sun. The spacecraft’s Earth eclipse season, which began on July 5, continues through August 2. Eclipse seasons are three-week periods twice a year when the spacecraft’s orbit passes “behind” Earth, briefly blocking out the Sun each day. Learn more about space weather:
NASA Space Alerts47,460 次观看 • 1 个月前
It’s #SunDay! Here’s your space weather report for the week of July 10 - July 16: • 1 M-class flare • 3 C-class flares • 29 coronal mass ejections • 0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. Those “blackouts” in the video below aren’t missing data — those are Earth eclipses! SDO is currently in its 33rd Earth eclipse season, which began on July 5 and will continue through August 2. Eclipse seasons are three-week periods twice a year when the spacecraft’s orbit passes “behind” Earth, briefly blocking out SDO's view of the Sun each day. Learn more about SDO and visualize its orbit:
NASA Space Alerts46,671 次观看 • 1 个月前
It’s #SunDay! Here’s your space weather report for the week of May 1 - 7: •2 M-class flares •2 C-class flares •29 coronal mass ejections •1 geomagnetic storm This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. It has been a relatively quiet week on the Sun, with the two M-class flares erupting off the Sun’s western limb (right side from SDO’s view) and not producing much impact on Earth. However, a large active region will soon be rotating into Earth’s view — you can see it toward the end of this video emerging from the eastern limb (left side from SDO's view). Keep an eye out in the coming week for potential solar activity! Learn more about space weather:
NASA Space Alerts102,914 次观看 • 3 个月前
It’s #SunDay! Here’s your space weather report for the week of June 26 - July 2: • 1 X-class flare • 24 M-class flares • 50 coronal mass ejections • 0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. The Sun put on its own fireworks show this week! 🎇 Most of this week’s flare activity came from Active Region 14479, which unleashed a barrage of M-class flares and one X-class flare, visible here beginning at about 2:09 in the video. Learn more about space weather:
NASA Space Alerts46,505 次观看 • 2 个月前
It’s #SunDay! Here’s your space weather report for the week of June 19 - 25: • 4 M-class flares • 0 C-class flares • 42 coronal mass ejections • 0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. All the action this week comes from two clustered active regions, AR14472 and AR14473. You can see them rotate onto the Sun’s disk from the Eastern limb (left side of the Sun) starting at about 0:30 into the video, and continue with several flares and bright coronal loops through about 1:30. Quite a show! 🤩 Learn more about space weather:
NASA Space Alerts46,534 次观看 • 2 个月前
It’s #SunDay! Here’s your space weather report for the week of April 10 - 16: • 30 coronal mass ejections (CMEs) • 0 M-class flares • 0 C-class flares associated with CMEs • 0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity, which was very quiet. Some C-class flares did occur on the Sun during this period, but none were associated with coronal mass ejections (CMEs) or other space weather events, so they are not reported here. Active region AR4419 first rotates onto the solar disk from the eastern limb (upper left edge) at about 1:20 into the video, then comes alive with lots of crackles and bursts starting at about 2:00 and continuing through the end. Its activity contrasts with the two other active regions on the Sun, AR4415, which moves across the Sun’s equatorial region, and AR4416, in the upper hemisphere, both of which showcase steadier, smoother brightenings of coronal loops. We’ll be watching all of these regions of possible activity in the coming week.
NASA Space Alerts81,554 次观看 • 4 个月前
It’s #SunDay! Here’s your space weather report for the week of June 5 - 11: • 1 M-class flare • 5 C-class flares • 36 coronal mass ejections • 1 geomagnetic storm (as of June 12, though another one is currently forecast for June 13) This video from NASA’s Solar Dynamics Observatory shows the week’s activity. This week’s most powerful flare was an M1.8 on June 6, which erupts from the southeastern (lower left) region of the Sun’s disk at about 0:42 in this video. That eruption also produced a coronal mass ejection that reached Earth three days later, but the bulk of the blast was oriented to the south and east of Earth, so the effect on our planet was minimal. Learn more about solar flares and coronal mass ejections:
NASA Space Alerts47,894 次观看 • 2 个月前
It’s #SunDay! Here’s your space weather report for the week of May 8 - 14: •1 M-class flare •1 C-class flare •31 coronal mass ejections •0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. The active region we spotted last week (which erupted with an M-class flare and a CME last Sunday) has moved across the Sun and is now center-disk. It’s right next to a coronal hole that unleashed a stream of fast solar wind to Earth. We’ll be watching both regions for continued activity this week. Learn more about space weather:
NASA Space Alerts51,144 次观看 • 3 个月前
It’s #SunDay! Here’s your space weather report for the week of April 17 - 23: •6 M-class flares •0 C-class flares •34 coronal mass ejections •1 geomagnetic storm This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. Two X-class flares erupted right after the end of this reporting period — they’ll be first up in next week’s space weather report! Another thing we *don’t* see here: comet PANSTARRS (C/2025 R3)! The comet is currently passing between the Sun and Earth, and ESA/NASA’s SOHO spacecraft is watching the comet as it streaks across the view of its C3 coronagraph. We'll share more views of that comet later; in the meantime, check the latest imagery here: Learn more about space weather:
NASA Space Alerts59,086 次观看 • 4 个月前
It’s #SunDay! Here’s your space weather report for the week of May 22 - 28: • 1 M-class flare • 0 C-class flares • 46 coronal mass ejections • 0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. Most of the action this week was on the far side of the Sun, out of SDO’s view. However, we do see a good example of a prominence beginning at about 20 seconds into the video on the lower western limb (right side edge) of the Sun. Prominences are huge clouds of electrified gas called plasma suspended in the solar atmosphere. Learn more about space weather:
NASA Space Alerts45,128 次观看 • 3 个月前
It’s #SunDay! Here’s your space weather report for the week of May 29 - June 4: • 1 X-class flare • 6 M-class flares • 47 coronal mass ejections • 0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. This week’s main event was the X-class flare on June 3, appearing at 2:26 in the video. Though that flare was this week’s brightest event, a few seconds before at 2:20 in the video, an M7-class flare erupts that might appear to the human eye to be even more impressive. In part, that’s because of the nice view of the burst of solar plasma (ultimately producing a coronal mass ejection) that erupts from the region right after the flare. Wow! 🤩 Learn more about space weather:
NASA Space Alerts41,737 次观看 • 2 个月前
It’s #SunDay! Here’s your space weather report for the week of April 3 - 9: •7 M-class flares •1 M-class flares •16 coronal mass ejections •1 geomagnetic storm This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. This week’s geomagnetic storm peaked on April 3, sparking auroras around the arctic circle and reaching a strength classification of G3 (strong). The cause was a CME that erupted from the Sun late on April 1. Aside from that, the Sun was fairly quiet during this reporting period. Learn more about space weather:
NASA Space Alerts62,576 次观看 • 4 个月前
It’s #SunDay! Here’s your space weather report for the week of April 24 - 30: • 2 X-class flares • 14 M-class flares • 18 coronal mass ejections • 0 geomagnetic storms This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s solar activity. Two X-class flares erupt on the right side of the disk at the beginning of the week. On April 29, a few spacecraft calibration maneuvers make it look like the Sun is dancing. Find out more about flares & coronal mass ejections:
NASA Space Alerts52,261 次观看 • 4 个月前
It’s #SunDay! Here’s your space weather report for the week of May 15 - 21: • 4 M-class flares • 3 C-class flares • 35 coronal mass ejections • 1 geomagnetic storm This video from NASA’s Solar Dynamics Observatory (SDO) shows the week’s activity. It was a fairly calm week on the Sun. A coronal mass ejection last week reached Earth on May 15, triggering a minor geomagnetic storm and leading to aurora sightings across the northern U.S. On May 20, SDO's Helioseismic and Magnetic Imager (HMI) paused normal science operations for a series of routine calibration maneuvers — measurements that keep the instrument's magnetic field and Doppler velocity data scientifically accurate. You can see these maneuvers starting at about 2:29 in the video. Learn more about space weather:
NASA Space Alerts35,355 次观看 • 3 个月前