SpaceWeather.com Archive — Tue, Sep 17, 2024

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CME IMPACT SPARKS SEVERE STORM (UPDATED): As predicted, a CME hit Earth's magnetic field on Sept. 16th (2341 UT). The impact sparked a G4-class (Severe) geomagnetic storm with auroras sighted as far south as Arizona. The severe phase of the storm is now over. However, minor G1-class storms remain possible on Sept. 17th as Earth exits the CME's wake. Aurora alerts: SMS Tex t

Full moonlight was supposed to spoil the show, but the auroras were bright enough to compete with the Harvest Moon. Paul Robinson sends this picture from Boulder, Colorado:

"Red rays were dimly visible to the unaided eye for about 5 minutes," says Robinson. "I photographed them using my Samsung S24 phone in night mode."

Photos are still coming in from Europe and many US states--including photos from drones. Browse the real time aurora gallery for the latest.

Realtime Aurora Photo Gallery
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PARTIAL ECLIPSE OF THE HARVEST MOON: This week's full Moon is special for several reasons. (1) It's the Harvest Moon, the full Moon closest to the autumnal equinox. (2) It's a perigee Moon, slightly closer to Earth than usual. And, (3), it's going to be partially eclipsed. This animation created by reader Peter Zimnikoval shows the Moon grazing Earth's shadow during the early UTC hours of Sept. 18th:

For sky watchers in the Americas, the eclipse occurs on Sept. 17th. Peak coverage occurs at 10:44 p.m. EDT (7:44 p.m. PDT), when a little more than 8 percent of the Moon will be in shadow.

Mainstream media stories are trumpeting this as a "supermoon eclipse." Indeed, it is a supermoon, or as an astronomer would say, a "perigee Moon." The Moon's orbit is an ellipse with one side ("perigee") about 50,000 km closer than the other ("apogee"). Full Moons that occur on the perigee side of the Moon's orbit are extra big and bright. This week's Harvest Moon becomes full within 10 hours of perigee, making it about 5 percent bigger and 13 percent brighter than usual. Is that really "super"? You decide.

Before the days of electric lights, farmers relied on moonlight to harvest ripening autumn crops after sunset. The partial eclipse will briefly dim the glow. Pro tip for farmers: Take your headlamp.

Realtime Space Weather Photo Gallery
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"HAND OF APOLLO" STAR TREK CHRISTMAS ORNAMENT: You can't buy this on Amazon. The Hand of Apollo Christmas Ornament is only available from the Earth to Sky Store. On Aug. 15, 2024, it flew to the stratosphere onboard a cosmic ray research balloon:

You can have it for $127.95. This ornament depicts the iconic opening scene from original Star Trek series episode "Who Mourns for Adonais?" first aired in 1967. Near the planet Pollux III, the Enterprise was held immobile by an energy field shaped as a human hand. It belonged to a being claiming to be the Greek god Apollo. This will look far out on your Christmas tree this December.

The students of Earth to Sky Calculus are selling space ornaments to support their cosmic ray ballooning program. Don't wait for Christmas--get yours now!