![]() ![]() "This indicates a strong incoming interplanetary shock." Ho checked the data right after the initial explosion on July 24th and saw a 10,000-fold increase of 50 MeV ions reaching the spacecraft. "This was definitely a big event," says George Ho of the Johns Hopkins Applied Physics Lab, co-principal investigator for the Energetic Particle Detector suite onboard Solar Orbiter. ![]() Considering that a typical CME would take two or three days to reach the spacecraft at its current location, a transit of only 32 hours confirms this CME was a fast-mover. The CME reached SolO on July 26th (0200 UT), barely 32 hours after it left the sun. Instead, it flew in the opposite direction and hit Europe's Solar Orbiter (SolO) spacecraft. If this CME had hit Earth, a strong (possibly severe) geomagnetic storm would have surely resulted. Its plane-of-sky speed in SOHO coronagraph images exceeded 1,500 km/s (3.4 million mph): On July 24th, a bright CME rocketed away from the farside of the sun. Stronger storms and bigger leaks are in the offing as Solar Cycle 25 intensifes. Indeed, a G1-class storm was underway at the time of Thomas's sighting. The ring current springs a leak most often during geomagnetic storms. At first, researchers didn’t know what they were and unwittingly gave them a misleading name: "Stable Auroral Red arcs." However, they are not auroras the red glow comes from Earth's ring current system. SARs were discovered in 1956 at the beginning of the Space Age. "There was one of the brightest SAR arcs that I have seen! It lasted around 45 minutes." "I almost fell over when I checked my camera," says photographer Harlan Thomas. On July 26th, heat from this ring current leaked into the upper atmosphere, creating a red arc over Slocan, British Columbia: Solar flare alerts: SMS Textĭid you know that Earth has rings? Unlike Saturn's rings, which are vast disks of glittering ice, Earth's rings are made of electricity-a donut-shaped circuit carrying millions of amps around our planet. A bright CME that left the area early on July 28th won't hit Earth, but future CMEs might as the new sunspots turn toward Earth this weekend. The eastern limb of the sun is increasingly active with the emergence of four new sunspots. 28, 2023, as a show of thanks for years of service and hope for future daisies: Until then, we will maintain AIM's iconic "daily daisy," frozen at Feb. There may be some hope of a recovery as AIM's orbit precesses into full sunlight in 2024. As a result AIM is offline, perhaps permanently. What happened to NASA's AIM spacecraft, which has been monitoring NLCs since 2007? Earlier this year, the spacecraft's battery failed. As the season progresses, these dots will multiply in number and shift in hue from blue to red as the brightness of the clouds intensifies. For the rest of the season, daily maps from NOAA 21 will be presented here:Įach dot is a detected cloud. ![]() An instrument onboard NOAA 21 ( OMPS LP) is able to detect NLCs (also known as "polar mesospheric clouds" or PMCs). The first clouds were detected inside the Arctic Circle by the NOAA 21 satellite. The northern season for NLCs began on May 26th. There are no significant equatorial coronal holes on the Earthside of the sun. Switch to: Europe, USA, New Zealand, Antarctica Neutron counts from the University of Oulu's Sodankyla Geophysical Observatory show that cosmic rays reaching Earth are slowly declining-a result of the yin-yang relationship between the solar cycle and cosmic rays. Credit: SDO/HMIĬosmic Rays Solar Cycle 25 is intensifying, and this is reflected in the number of cosmic rays entering Earth's atmosphere. New sunspots AR3386-89 pose a threat for M-class solar flares. ![]()
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