|NASA has an interesting article on Spaceweather.com, see link, which is copied and shown below. |
Key statement: "Our latest measurements show that cosmic rays are intensifying, with an increase of more than 12% since 2015. Why are cosmic rays intensifying? The main reason is the sun. Solar storm clouds such as coronal mass ejections (CMEs) sweep aside cosmic rays when they pass by Earth. During Solar Maximum, CMEs are abundant and cosmic rays are held at bay. Now, however, the solar cycle is swinging toward Solar Minimum, allowing cosmic rays to return."
"Cosmic Rays in the Atmosphere
Updated: Sept. 29 2016 // Next Flight: Oct. 1, 2016