Space Weather Message Code: ALTEF3 Serial Number: 3591 Issue Time: 2025 Dec 31 1632 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3590 Begin Time: 2025 Dec 21 1425 UTC Yesterday Maximum 2MeV Flux: 5613 pfu Comment: Electrons went over threshold at 31/1255 through 31/1530 UTC. Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscripti ...Continue Reading

Space Weather Message Code: ALTXMF Serial Number: 507 Issue Time: 2025 Dec 31 1344 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2025 Dec 31 1342 UTC NOAA Scale: R2 - Moderate NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time in ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3590 Issue Time: 2025 Dec 30 0502 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3589 Begin Time: 2025 Dec 21 1425 UTC Yesterday Maximum 2MeV Flux: 6690 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or updat ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3589 Issue Time: 2025 Dec 29 0806 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3588 Begin Time: 2025 Dec 21 1425 UTC Yesterday Maximum 2MeV Flux: 8999 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or updat ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3588 Issue Time: 2025 Dec 28 0459 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3587 Begin Time: 2025 Dec 21 1425 UTC Yesterday Maximum 2MeV Flux: 6123 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or updat ...Continue Reading

*In this edition: * CubeSatSim Kits Now Available Youth on the Air Camp 2026 Applications Open AMSAT Youth Initiative: "Satellites and Climate Change" Course Now Online United Nations Office for Outer Space Affairs: Sustainable Development Goals Launch Teams Practiced Artemis 2 Countdown Changes to AMSAT-NA TLE Distribution for December 26, 2025 ARISS NEWS AMSAT Ambassador Activities Satellite Shorts From All Over The AMSAT® News Service bulletins are a free, weekly news and information service of ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3587 Issue Time: 2025 Dec 27 0507 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3586 Begin Time: 2025 Dec 21 1425 UTC Yesterday Maximum 2MeV Flux: 8195 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or updat ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3586 Issue Time: 2025 Dec 27 0324 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3585 Begin Time: 2025 Dec 21 1425 UTC Yesterday Maximum 2MeV Flux: 8195 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or updat ...Continue Reading

Space Weather Message Code: ALTXMF Serial Number: 506 Issue Time: 2025 Dec 27 0150 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2025 Dec 27 0148 UTC NOAA Scale: R2 - Moderate NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time in ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3585 Issue Time: 2025 Dec 26 0512 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3584 Begin Time: 2025 Dec 21 1425 UTC Yesterday Maximum 2MeV Flux: 8651 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or updat ...Continue Reading