Related by context. Frequent words. (Click for all words.) 64 solar irradiance 62 sunspot activity 61 solar corona 61 X ray emission 60 auroral 59 sunspot cycle 59 visible wavelengths 58 ionospheric 58 mid latitudes 58 aurora 57 auroras 57 insolation 57 Gamma ray bursts 56 geomagnetic storms 56 irradiance 56 geomagnetic 56 intensities 56 magnetic reconnection 56 geomagnetic field 56 atmospheric turbulence 55 equinoxes 55 oscillations 55 geomagnetic storm 55 hydrothermal activity 54 astronomical objects 54 Leonids 54 sunspot numbers 54 Hubble observations 54 sunspots 54 supermoon 54 radiative forcing 54 solar flares 53 cosmic ray 53 Earth magnetosphere 53 GRBs 53 latitudinal 53 sunspot 53 interplanetary spacecraft 53 amplitudes 53 convective 53 substorms 53 Sunspots 52 Crab Nebula 52 supernova explosion 52 El Ninos 52 occultation 52 meteoroid 52 poleward 52 Gamma rays 52 radial velocity 52 gamma ray burst 52 shorter wavelengths 52 ionosphere 52 atmospheric 51 cryosphere 51 ITCZ 51 solar nebula 51 longitudes 51 astrophysical 51 meteor showers 51 coronal mass ejections 51 comet nucleus 51 cirrus clouds 51 polar regions 51 infrared wavelengths 51 solstices 51 CMEs 51 ecliptic 51 climatological 51 storminess 51 equator 51 atmospheric methane 51 astronomical observations 50 magnetosphere 50 polar caps 50 Saturn moon Enceladus 50 coronal mass ejection 50 NASA Cassini spacecraft 50 infrared imagery 50 innermost planet 50 volcanism 50 redshifts 50 latitudes 50 meteoroids 50 Saturn rings 50 pulsations 50 ringed planet 50 Cosmic rays 50 glacial melt 50 scarps 50 Leonid meteor shower 50 equatorial 50 eastern equatorial Pacific 49 hydrological cycle 49 explosive eruptions 49 oscillation 49 greenhouse warming 49 temperature gradient 49 polar 49 sunrises 49 paleoclimate