Related by context. Frequent words. (Click for all words.) 69 sunspot activity 68 sunspot cycle 68 geomagnetic 68 sunspot numbers 63 geomagnetic field 63 sunspot 61 geomagnetic storm 61 geomagnetic storms 60 ionospheric 59 sunspots 59 auroral 57 solar flares 57 substorms 57 irradiance 57 ionosphere 56 supermoon 56 X ray emission 56 occultation 56 cosmic ray 56 decadal 56 Sunspots 55 convective 55 oscillations 55 storminess 55 meteoroid 55 meteor showers 54 coronal mass ejection 54 CMEs 54 Leonids 54 seismicity 54 auroras 53 Geminids 53 aurora 53 Earth magnetosphere 52 Perseid meteor shower 52 meteor shower 52 climatological 52 perigee 52 amplitudes 52 #/#Z 51 meteorologists predict 51 temperature gradient 51 mid latitudes 51 Perseids 51 El Ninos 51 Increasing clouds 51 gamma ray burst 50 cloudiness 50 perturbations 50 volcanism 50 coronal mass ejections 50 magnetosphere 50 volcanic activity 50 lightning flashes 50 equinoxes 50 equinox 50 cosmic rays 50 GeV 50 El Nino phenomenon 50 volcanic earthquakes 50 cirrus clouds 49 oscillation 49 thermosphere 49 perturbation 49 ozone concentrations 49 synoptic 49 COROT 49 gravitational waves 49 hydrological cycle 49 cosmic radiation 49 XMM Newton 49 Eta Carinae 49 planet orbits 49 monsoon rainfall 49 thundersnow 49 Saturn moon Enceladus 49 heaviest precipitation 49 equatorial Pacific 49 precipitation 48 equatorial Pacific Ocean 48 vertical wind shear 48 pulsations 48 infrasound 48 eruptions 48 Today Mostly sunny 48 autumnal equinox 48 aerosol particles 48 barometric pressure 48 atmospheric CO 48 ecliptic 48 lunar eclipses 48 Serreze 48 tropical cyclones 48 seismic activity 48 gravitational wave 48 MARSIS 48 intensities 48 northeasterly winds 47 Solar Dynamics 47 minima 47 troposphere