Space Weather Scale for Solar Radiation Storms
(1 cycle=11 years)
||10||50 per cycle|
||102||25 per cycle|
||103||10 per cycle|
||104||3 per cycle|
||105||Fewer than 1 per cycle|
* Flux levels are 5 minutes averages. Flux in particles·s-1·ster-1·cm-2. Based on this measure, but other physical measures are also considered.
** These events can last more than one day.
*** High energy particle measurements (>100 MeV) are a better indicator of radiation risk to passenger and crews. Pregnant women are particularly susceptible.