Related by context. Frequent words. (Click for all words.) 69 solar flares 64 CMEs 60 magnetic fields 59 cosmic ray 59 auroras 57 geomagnetic field 55 ionosphere 55 geomagnetic 55 sunspot activity 54 updrafts 54 sunspots 54 oscillations 53 magnetosphere 53 cosmic rays 53 aurora 52 gravitational waves 52 meteor showers 52 volcanic eruptions 51 gravitational 51 gamma ray burst 51 cosmic radiation 51 gamma ray bursts 51 perturbations 51 vortices 51 occultation 51 convective 50 galaxy clusters 50 greenhouse warming 50 celestial objects 50 supernova explosion 50 terrestrial planets 50 volcanic activity 50 volcanism 50 meteor shower 50 GRBs 50 meteors 50 gamma rays 50 atmospheric circulation 50 astrophysical 49 wind shear 49 asteroids 49 tropical cyclones 49 asteroid 49 neutron star 49 supernovae 48 ultraviolet radiation 48 gravitational lensing 48 lightning strikes 48 Perseids 48 waterspouts 48 comets 48 dynamical 48 storms 48 supernovas 47 astronomers 47 UV radiation 47 pulsars 47 isolated tornadoes 47 mid latitudes 47 Saturn rings 47 dust devils 47 planets 47 radiations 47 perturbation 47 quasar 46 ENSO 46 Enceladus 46 comet 46 downdrafts 46 atmospheric 46 eruptions 46 sunspot 46 phenomena 46 unaided eye 46 ejecta 46 particles 46 lightning flashes 46 atmospheric chemistry 46 orbiting spacecraft 46 quasars 46 water vapor 45 astrophysicists 45 thunderstorms 45 NASA Cassini spacecraft 45 #/#Z 45 latitudes 45 thunder storms 45 Cassini 45 comet nucleus 45 ice accumulations 45 El Niño 45 NASA Aqua 45 silicates 45 nuclei 45 neutron stars 45 celestial bodies 45 perigee 45 equatorial Pacific 45 brown dwarfs 44 orbiting satellites 44 interstellar medium