Related by context. Frequent words. (Click for all words.) 69 ionosphere 65 auroral 58 cosmic ray 57 geomagnetic 56 anisotropy 56 gravitational lensing 56 atmospheric 55 troposphere 55 geomagnetic storms 54 X ray emission 54 convective 54 gravitational wave 53 interferometry 53 irradiance 53 COROT 53 atmospheric chemistry 53 occultation 53 gravitational waves 53 geostationary satellites 52 solar flares 52 synoptic 52 interferometer 52 astrophysical 52 meteoroid 52 sunspot activity 52 photometric 52 infrared wavelengths 52 XMM Newton 52 amplitudes 52 radiative 52 synthetic aperture radar 52 Earth magnetosphere 51 satellites 51 dynamical 51 multispectral 51 infrasound 51 astronomical objects 51 decadal 51 aurora 51 infrared 51 orbital 51 spectral 50 magnetic fields 50 aerosol particles 50 CloudSat 50 Very Large Array 50 auroras 50 parallax 50 redshift 50 THEMIS 50 laser pulses 50 spectra 50 dipole 50 astronomical observations 50 spectroscopic 50 magnetosphere 49 cirrus clouds 49 optical telescopes 49 TRMM 49 CMEs 49 NASA Cassini spacecraft 49 sunspot 49 coronal 49 sunspots 49 STEREO 49 geomagnetic field 49 Cassini 49 geomagnetic storm 49 infrared spectrometer 49 isotropic 49 GeV 49 lidar 49 oscillations 49 equatorial 49 spatial resolution 49 geodetic 49 exoplanet 48 ejecta 48 Computer simulations 48 Spectrometer 48 neutrino 48 spectroscopy 48 cosmic rays 48 surface roughness 48 diffraction 48 electromagnetic 48 magnetar 48 observatories 48 cosmic microwave background 48 microsatellites 48 climatology 48 superfluid 48 satellites orbiting 48 gamma ray burst 48 Astrophysics 48 MODIS 48 Envisat 48 WMAP 48 geostationary 48 ICESat 48 water vapor