NASA, NOAA: Sun Reaches Maximum Phase in 11-Year Solar Cycle Science@NASAThe Sun has officially reached its 'solar maximum period' in this solar cycle Earth.comNASA Confirms Sun Enters Solar Maximum: Spectacular Auroras and Intensified Space Weather Ahead The Daily Galaxy --Great Discoveries ChannelThe Sun Is At ‘Solar Maximum’ And Aurora Will Now Spike, NASA Says ForbesSun reaches Solar Maximum but it doesn’t mean peak activity is over AOL