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#CME

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Union City, CA Weather

Negative polarity CH HSS triggers G3 – Strong geomagnetic storm

A G3 – Strong geomagnetic storm was observed at 02:16 UTC on May 29, 2025, triggered by the arrival of a negative polarity coronal hole high-speed stream (CH HSS) at Earth. Coronal hole high-speed streams, and their associated transition zones called co-rotating interaction regions (CIRs), can create CME-like shock waves that are capable of producing strong geomagnetic disturbances and widespread auroras.

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon. #geomagneticstorm #spaceweather #CME
watchers.news/2025/05/29/negat

The Watchers · Negative polarity CH HSS triggers G3 - Strong geomagnetic stormBy Teo Blašković
Astro Hawk (Ian Kluft) ✅🚀🛰️

"G3 (Strong) Geomagnetic Storm Watch for 23 Mar" by NOAA Space Weather Prediction Center - The Sun erupted a coronal mass ejection (CME) expected to reach Earth on March 23 UTC at G3 storm level. That means forecasted Kp=7 for aurora down to Oregon, Idaho, Wyoming, Nebraska, Iowa, Illinois, Indiana, Ohio, Pennsylvania, New York and Massachusetts. spaceweather.gov/news/g3-stron #astronomy #aurora #AuroraBorealis #AuroraAustralis #CME #SpaceWeather

Westport Observatory

While another solar wind stream is heading for Earth today, a solar storm last year demonstrated that even smaller solar events are something to worry about. The Gannon storm in May was formed when dozens of solar flares sent at least five coronal mass ejections (CMEs) toward Earth. Those CMEs merged creating a major event. Researchers estimate the Gannon storm caused at least $500 million in losses for farmers alone. spacenews.com/solar-flares-in-

#Spaceweather#solarstorm#CME
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Artemis

Hey Folks! There's another cool #Aurora northern lights show tonight!!!

Not as big as the solar storm in the spring, but still a pretty good one. Make plans to go find somewhere dark and look at the northern horizon (in the northern hemisphere). Remember, to your eyes it might just look like city lights, but to your phone on night-mode (long exposure) it will look a lot cooler.

More forecast info:
gi.alaska.edu/monitors/aurora-

#SolarStorm#NorthernLights#Sun
Westport Observatory

SEVERE GEOMAGNETIC STORM WATCH: An X-class solar flare on Oct. 8th hurled a fast-moving CME directly toward Earth. NOAA and NASA models agree that it could arrive as early as Oct. 10th, with NOAA forecasters warning of a possibly severe geomagnetic storm. This movie from SOHO shows not only the CME, but also Comet Tsuchinshan-ATLAS passing close to the sun. The CME will hit the comet before it hits Earth and could rip off the comet's tail. Spaceweather.com

#CME#Comet#CometA3
Replied in thread
Spaceflight 🚀

The #X9 solar ☀️ flare emitted is the largest categorised by #NASA. A second #CME is likely to hit Earth on Saturday and Sunday. #SolarFlares do not cause the Northern Lights. They are caused by a phenomenon called coronal mass ejections that erupt from an active sun spot. Combined with flares, they can create #SolarStorms that interact with Earth's magnetic field 🌐 or #magnetosphere. bbc.com/news/articles/cy437gnp

www.bbc.comNorthern Lights sightings possible as huge solar flare spottedThe largest solar flare since 2017 has been spotted erupting from the Sun’s surface.
Westport Observatory

GEOMAGNETIC STORMS THIS WEEKEND: As many as three CMEs are heading for Earth. The most potent is expected to arrive during the late hours of Oct. 5th, potentially sparking a strong geomagnetic storm. For observers in the USA, this means the night of Oct. 5-6. Mid-latitude auroras are possible this weekend in Europe and the USA. At this time of year, even weak CMEs can be effective due to the autumnal Russell-McPherron effect. The collective effect all three CMEs could therefore cause strong storms throughout the weekend. Keep on eye on Spaceweather.com

#aurora#CME#spaceweather
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