G2 – Moderate Geomagnetic Storm Alert issued on April 18, 2026
A G2 – Moderate Geomagnetic Storm Alert was issued for April 18, 2026, valid from 06:00 to 09:00 UTC after the K-index reached 6.
G1 – Minor Geomagnetic Storm Alert issued on April 18, 2026
A G1 – Minor Geomagnetic Storm Alert was issued on April 18, 2026. The alert is valid for the synoptic period from 06:00 to 09:00 UTC.
Shallow M5.5 earthquake hits Carlsberg Ridge
A shallow M5.5 earthquake struck the Carlsberg Ridge at 05:59 UTC on April 18, 2026. The event originated at a depth of 10.0 km (6.2 miles), based on data provided by USGS.
G1 – Minor Geomagnetic Storm Alert issued on April 18
A G1 – Minor Geomagnetic Storm Alert was issued on April 18, 2026, after the K-index reached 5 at 05:25 UTC. Active warning is in effect.
Alert – Geomagnetic K-index of 4 issued on April 18, 2026
A Geomagnetic K-index of 4 Alert was issued on April 18, 2026. The alert is valid for the synoptic period 03:00–06:00 UTC.
Asteroid 2026 HJ will fly past Earth at 0.3 LD on April 19, 2026
Asteroid 2026 HJ will pass Earth at a distance of 0.3 LD / 0.00076 AU (113 600 km / 70 600 miles) on April 19, 2026.
Alert – Electron 2 MeV Integral Flux exceeded 1,000 pfu on April 17, 2026
An Electron 2 MeV Integral Flux Alert was issued on April 17, 2026. The alert notes flux levels exceeded 1,000 pfu, posing increased risk to satellite systems.
G1 – Minor Geomagnetic Storm Watch issued for April 17, 2026
A G1 – Minor Geomagnetic Storm Watch is active for April 17, 2026, with G2 – Moderate levels expected through April 18 and G1 levels on April 19.
Shallow M6.0 earthquake hits south of the Kermadec Islands
A shallow M6.0 earthquake occurred south of the Kermadec Islands at 13:30 UTC on April 16, 2026. The quake originated at a depth of 10.0 km (6.2 miles), according to USGS data.
Electron 2 MeV Integral Flux Alert issued on April 16, 2026
An Electron 2 MeV Integral Flux Alert was issued on April 16, 2026 after flux levels exceeded 1,000 pfu, continuing an event since April 3.
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