Solar storms/flares are solar events sending particles in space that are potentially dangerous on Earth. From Wikipedia:

Solar flares strongly influence the local space weather in the vicinity of the Earth. They can produce streams of highly energetic particles in the solar wind, known as a solar proton event. These particles can impact the Earth's magnetosphere (see main article at geomagnetic storm), and present radiation hazards to spacecraft and astronauts. Additionally, massive solar flares are sometimes accompanied by coronal mass ejections (CMEs) which can trigger geomagnetic storms that have been known to disable satellites and knock out terrestrial electric power grids for extended periods of time.

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They are rated by the US NOAA on a scale from 1 to 5. For instance, level 3 events occur about once a year:

S3 (Strong) - Biological: radiation hazard avoidance recommended astronauts on EVA. Passengers and crew in commercial jets at high latitudes may receive radiation equivalent to approximately 1 chest x-ray.

There are also geomagnetic storms listed on the same page.


Is this a real risk for commercial aviation, if so how do airlines treat this risks on affected routes, e.g.:

  • How are airlines informed?
  • Are pilot-in-command informed and allowed to veto a flight?
  • What do they do regarding exposed crews and passengers?
  • $\begingroup$ I don't have an answer for you, but I'd imagine you could correlate data between a listing of the last several S3 solar storms and the number of aircraft incidents on those days to see if there's any statistically significant increase in issues. You might have to dig a little deeper and get into maintenance issues, as well - it could cause problems on aircraft that don't make the headlines, yet still are significant enough to warrant repair work after the flight. $\endgroup$
    – FreeMan
    Oct 14 '16 at 17:49
  • 1
    $\begingroup$ The entire Swedish airspace was closed for hours just last year when the radar system failed, allegedly due to a solar storm. No accidents happened, but it was certainly a dangerous situation. So, in terms of acutely taking out critical equipment and thus increasing the risk for mid air collisions, yes, solar storms can be a real risk to commercial aviation. $\endgroup$ Oct 14 '16 at 17:51
  • $\begingroup$ @J.Hougaard: Be aware this solar activity version is apparently seriously challenged as an attempt to hide a cyber attack by an "APT" ("advanced persistent threat group"...) Thanks anyway for the interesting news, I have no opinion. $\endgroup$
    – mins
    Oct 14 '16 at 18:38

A pilot in command can always veto, scrub, or divert a flight. Per the Federal Aviation Regulations FAR 91.3(a), "The pilot in command of an aircraft is directly responsible for, and is the final authority as to, the operation of that aircraft." This applies to airline operations (air carriers, FAR Part 121), air taxis and charters (FAR Part 135), and general aviation (FAR Part 91) operations.

A much bigger issue than than the radiation exposure for the people will be the atmospheric effects of the radiation, and how the radiation affects, e.g., satellite navigation. A very strong solar flare can require shutting down some on-orbit satellites to avoid damage—including navigation satellites, such as GPS. A very strong solar flare can ionize the atmosphere to the point it interferes with communications, especially in the HF band used for transoceanic communications.


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