Related by context. Frequent words. (Click for all words.) 62 geomagnetic field 59 sunspot activity 58 ionosphere 56 sunspots 55 sunspot 55 dynamical 55 geomagnetic storms 54 polar 53 aurora 53 cosmic ray 53 oscillations 52 occultation 51 ENSO 51 Uranus 50 convective 50 climatological 50 auroras 50 perturbations 50 astrophysical 50 geomagnetic storm 50 magnetic fields 50 planetary 50 magnetosphere 50 X ray emission 49 latitudes 49 anisotropy 49 magnetic 49 abundances 49 interferometry 49 crustal 49 atmospheric circulation 49 COROT 49 gravitational wave 48 gravitational 48 Sunspots 48 heliosphere 48 volcanism 48 terrestrial planets 48 XMM Newton 48 decadal 48 dipole 48 gravitational lensing 48 Enceladus 48 supermoon 48 mid latitudes 48 electromagnetic 48 minima 47 solar flares 47 celestial bodies 47 meteor showers 47 magnetization 47 astronomers 47 exoplanet 47 magnetic anomalies 47 outer planets 47 amplitudes 47 magnetar 47 magmatic 47 radiative 46 atmospheric 46 planets 46 superfluid 46 Martian 46 martian 46 astronomical observations 46 landforms 46 spacetime 46 perturbation 46 oscillation 46 equatorial 46 ecliptic 46 El Ninos 46 extrasolar planets 45 synoptic 45 CMEs 45 isotopic 45 galaxy cluster 45 topological 45 NASA Cassini spacecraft 45 ringed planet 45 troposphere 45 Jupiter moons 45 equatorial Pacific 45 periodicity 45 Sunspot 45 coronal mass ejections 45 celestial 45 albedo 45 quantum mechanical 44 vortices 44 temperature gradient 44 Earth asteroids 44 perigee 44 seismicity 44 cosmic rays 44 aurora borealis 44 high temperature superconductors 44 spectroscopic 44 ejecta 44 North Atlantic Oscillation 44 equinox