# S4 Severe Solar Radiation Storm in progress per NOAA GOES-19

_Saturday, June 27, 2026 at 12:05 AM EDT · science · Latest · Tier 2 — Notable_

An S4 severe solar radiation storm is in progress. NOAA's GOES-19 satellite measurements show the ongoing solar radiation storm has intensified to severe on the NOAA Space Weather Scales and it is still increasing.

A severe radiation storm of this intensity is a rare event. It exceeds the intensity during the October 2003 Halloween space weather storms. This significant level has not been observed since October 2003.

Potential impacts include increased radiation exposure risk for astronauts and flights on polar routes. Enhanced risk to satellites, especially those in geostationary orbit, and space launch systems is also present. Loss of high frequency communications over the horizon in polar regions may occur.

The Space Weather Prediction Center has notified airlines, the FAA, NASA, FEMA, NERC and other stakeholders. It is supporting preparedness actions as conditions evolve. Potential effects are mainly restricted to aviation polar routes and high frequency radio communications in polar regions.

## Sources

- [spaceweather.gov](http://www.spaceweather.gov/news/s4-severe-solar-radiation-storm-progress-january-19th-2026)

---
Canonical: https://techandbusiness.org/newswire/WMYow9Ig064KslncDOwiOS
Retrieved: 2026-06-27T08:38:12.720Z
Publisher: Tech & Business (techandbusiness.org)