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  • Terrestrial atmosphere and its relation to the sun
  • Earth's ionosphere & aeronomy
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  • Terrestrial planets systems
  • Small bodies (dwarf planets, asteroids, comets) to dust
  • Giant planets systems
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  • Aerosols and particles
  • Airglow
  • Atmospheric electricity
  • Atmospheric ozone
  • Equatorial atmosphere
  • General climatology
  • General circulation
  • Ion chemistry of the atmosphere
  • Ionospheric effects on the atmosphere
  • Long-term changes and trends
  • Magnetospheric effects on the atmosphere
  • Middle atmosphere composition and chemistry
  • Middle atmosphere dynamics
  • Modelling of the atmosphere
  • Polar atmospheric processes
  • Thermospheric composition and chemistry
  • Thermospheric dynamics
  • Tropospheric composition and chemistry
  • Tropospheric dynamics
  • Volcanic effects
  • Vertical coupling processes
  • Radiative processes
  • Solar forcing of the lower and middle atmosphere
  • Solar forcing of the thermosphere
  • Solar-induced atmospheric variability
  • Turbulence
  • Waves and tides
  • Instruments and techniques
  • General or miscellaneous
  • Active experiments
  • Auroral ionosphere
  • Climatology of the ionosphere
  • Electric fields and currents
  • Electromagnetic wave propagation
  • Equatorial ionosphere
  • Ion chemistry and composition
  • Ionization mechanisms
  • Ionosphere–atmosphere interactions
  • Ionosphere–magnetosphere interactions
  • Ionospheric disturbances
  • Ionospheric irregularities
  • Ionospheric variability
  • Long-term changes and trends
  • Midlatitude ionosphere
  • Modelling and forecasting
  • Particle precipitation
  • Planetary ionospheres
  • Plasma convection
  • Plasma temperature and density
  • Plasma waves and instabilities
  • Polar ionosphere
  • Solar-induced atmospheric variability
  • Solar radiation and cosmic ray effects
  • Space weather effects
  • Wave–particle interactions
  • Waves and tides
  • Instruments and techniques
  • General or miscellaneous
  • Auroral phenomena
  • Bow shock and foreshock
  • Current systems
  • Electric fields
  • Energetic particles, precipitating
  • Energetic particles, trapped
  • Magnetopause, cusp, and boundary layers
  • Magnetosheath
  • Magnetosphere interactions with satellites and rings
  • Magnetosphere–ionosphere interactions
  • Magnetospheric configuration and dynamics
  • Magnetotail
  • Magnetotail boundary layers
  • MHD waves and instabilities
  • Particle acceleration
  • Planetary magnetospheres
  • Plasma convection
  • Plasma sheet
  • Plasmasphere
  • Plasma waves and instabilities
  • Polar cap phenomena
  • Radiation belts
  • Solar wind interactions with unmagnetized bodies
  • Solar wind–magnetosphere interactions
  • Storms and substorms
  • Active perturbation experiments
  • Charged particle motion and acceleration
  • Discontinuities
  • Electrostatic structures
  • Experimental and mathematical techniques
  • Ionization processes
  • Kinetic and MHD theory
  • Laboratory studies
  • Magnetic reconnection
  • Nonlinear phenomena
  • Numerical simulation studies
  • Radiation processes
  • Shock waves
  • Space weather effects
  • Spacecraft sheaths, wakes, charging
  • Transport processes
  • Turbulence
  • Wave–particle interactions
  • Waves and instabilities
  • Wave–wave interactions
  • Instruments and techniques
  • General or miscellaneous
  • Corona
  • Transition region
  • Chromosphere
  • Photosphere
  • Propagation of CMEs in the heliosphere
  • Solar activity
  • Solar irradiance
  • EUV/UV emission
  • Visible emission
  • X-ray and Gamma ray emission
  • Radio emissions
  • Energetic particles
  • Flares and flare-CME relation
  • Solar magnetic field
  • Solar and stellar relation
  • Rocky planets
  • Formation
  • Accretion
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  • Atmospheres
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  • Interplanetary dust
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  • Interaction solar/stellar wind
  • Interplanetary medium
  • Solar wind
  • Solar wind composition
  • Meteors
  • Fire balls
  • Radar meteors
  • Meteoric smoke particles
  • Polar mesospheric clouds
  • Polar mesospheric cloud particles
  • Ionospheric scintillation
  • Interplanetary scintillation
  • Nocti-lucent clouds
  • Polar mesospheric summer echoes
  • Sample return
  • Orbiters
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  • Rovers
  • Instrumentation
  • Observation
  • Experiment
  • Modelling
  • Ceres
  • Vesta
  • Giant planets
  • Outer planets
  • Gas giants
  • Icy planets
  • Satellites
  • Icy moons
  • Atmospheres
  • Magnetospheres
  • Rings
  • Surfaces
  • Gravity field
  • Magnetic field
  • Interior
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  • Jupiter
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  • Ganymede
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  • Climate-related variables in (exo) planetary environments
  • Life in (exo) planetary environments
  • Origin(s) and evolution of life
  • Biosignatures
  • Habitability
  • Stellar wind
  • Stellar wind composition
  • Magnetospheres
  • High energy particles
  • Interaction with (exo) planetary atmospheres
  • Telescopes
  • Instrumentation
  • Observation
  • Experiment
  • Modelling
  • Terrestrial
  • Rocky
  • Gaseous
  • Earth-like
  • Magma ocean
  • Habitability
  • Formation
  • Dynamics
  • Atmospheres
  • Outgassing
  • Escape
  • Delivery
  • Climate
  • Photochemistry
  • Cosmic rays
  • Biogeochemistry
  • Spectral signatures
  • Biosignatures
  • Bioindicators
  • Origins
  • Gas
  • Dust
  • Planetary disk
  • Observation
  • Experiment
  • Modelling
  • Instrumentation
  • Instruments useful in three or more fields
  • History of solar-terrestrial science
  • History of planetary sciences
  • New fields (not classifiable under other headings)
  • Notices and announcements
  • Techniques applicable in three or more fields
  • Corrections

  • Past topics

  • Ionospheric variability

• Keywords (old)

  Select all

  • Past topics

  • Atmospheric composition and structure
  • 0305 Aerosols and particles (2010–2015)
  • 0310 Airglow and aurora (2010–2016)
  • 0315 Biosphere–atmosphere interactions
  • 0320 Cloud physics and chemistry (2011–2015)
  • 0325 Evolution of the atmosphere (2010–2014)
  • 0330 Geochemical cycles (2013–2014)
  • 0335 Ion chemistry of the atmosphere
  • 0340 Middle atmosphere – composition and chemistry (2010–2015)
  • 0345 Pollution–urban and regional (2010–2016)
  • 0350 Pressure, density, and temperature (2010–2015)
  • 0355 Thermosphere – composition and chemistry (2014–2015)
  • 0360 Transmission and scattering of radiation (2010–2013)
  • 0365 Troposphere – composition and chemistry (2011–2014)
  • 0370 Volcanic effects (2015)
  • 0394 Instruments and techniques (2010–2015)
  • 0399 General or miscellaneous (2010–2013)
  • Electromagnetics
  • 0604 Antenna arrays
  • 0609 Antennas
  • 0614 Biological effects (2011)
  • 0619 Electromagnetic theory (2012)
  • 0624 Guided waves (2010–2011)
  • 0629 Inverse scattering
  • 0634 Measurement and standards (2010)
  • 0639 Nonlinear electromagnetics
  • 0644 Numerical methods (2013–2014)
  • 0649 Optics
  • 0654 Plasmas (2011–2015)
  • 0659 Random media and rough surfaces (2010)
  • 0664 Reflectors and feeds
  • 0669 Scattering and diffraction (2013)
  • 0674 Signal processing and adaptive antennas
  • 0679 Singularity expansion method
  • 0684 Transient and time domain
  • 0689 Wave propagation (2010–2016)
  • 0694 Instrumentation and techniques
  • 0699 General or miscellaneous
  • Geomagnetism and paleomagnetism
  • 1505 Biomagnetism (2011)
  • 1510 Dynamo theories
  • 1515 Geomagnetic induction (2013–2016)
  • 1520 Paleomagnetic secular variation
  • 1525 Paleomagnetism applied to tectonics
  • 1530 Rapid time variations (2010–2011)
  • 1535 Reversals (process, timescale, magnetostratigraphy)
  • 1540 Rock and mineral magnetism
  • 1545 Spatial variations (all harmonics and anomalies)
  • 1550 Spatial variations attributed to seafloor spreading
  • 1555 Time variations – diurnal to secular (2010–2015)
  • 1560 Time variations – secular and long term (2011–2014)
  • 1594 Instruments and techniques (2014–2016)
  • 1599 General or miscellaneous (2011–2016)
  • History of geophysics
  • 1704 Atmospheric sciences (2010–2015)
  • 1709 Geodesy (2015)
  • 1714 Geomagnetism and paleomagnetism
  • 1719 Hydrology
  • 1724 Ocean sciences (2010–2015)
  • 1729 Planetology
  • 1734 Seismology
  • 1739 Solar–planetary relationships (2012–2015)
  • 1744 Tectonophysics
  • 1749 Volcanology, geochemistry, and petrology
  • 1794 Instruments and techniques
  • 1799 General or miscellaneous
  • Hydrology
  • 1803 Anthropogenic effects
  • 1806 Chemistry of fresh water
  • 1809 Desertification
  • 1812 Drought
  • 1815 Erosion and sedimentation
  • 1818 Evapotranspiration
  • 1821 Floods
  • 1824 Geomorphology
  • 1827 Glaciology
  • 1830 Groundwater
  • 1833 Hydroclimatology
  • 1836 Hydrologic budget
  • 1839 Infiltration
  • 1842 Irrigation
  • 1845 Limnology
  • 1848 Networks
  • 1851 Plant ecology
  • 1854 Precipitation (2010–2013)
  • 1857 Reservoirs
  • 1860 Runoff and streamflow
  • 1863 Snow and ice (2010)
  • 1866 Soil moisture
  • 1869 Stochastic processes
  • 1872 Transport (2010–2013)
  • 1875 Water balance
  • 1878 Water–energy interactions (2014)
  • 1881 Water quality
  • 1884 Water supply
  • 1894 Instruments and techniques
  • 1899 General or miscellaneous
  • Interplanetary physics
  • 2104 Cosmic rays (2010–2016)
  • 2109 Discontinuities (2011–2012)
  • 2114 Energetic particles (2010–2016)
  • 2119 Flare and stream dynamics
  • 2124 Heliopause and solar wind termination
  • 2129 Interplanetary dust (2011–2013)
  • 2134 Interplanetary magnetic fields (2009–2015)
  • 2139 Interplanetary shocks (2010–2016)
  • 2144 Interstellar gas
  • 2149 MHD waves and turbulence (2009–2015)
  • 2154 Planetary bow shocks (2011–2015)
  • 2159 Plasma waves and turbulence (2010–2014)
  • 2164 Solar wind plasma (2010–2016)
  • 2169 Sources of the solar wind (2012)
  • 2194 Instruments and techniques (2011–2016)
  • 2199 General or miscellaneous (2010)
  • Ionosphere
  • 2403 Active experiments (2010–2015)
  • 2407 Auroral ionosphere (2010–2016)
  • 2411 Electric fields and currents (2010–2015)
  • 2415 Equatorial ionosphere (2010–2016)
  • 2419 Ion chemistry and composition (2010–2015)
  • 2423 Ionization mechanisms (2009–2014)
  • 2427 Ionosphere–atmosphere interactions (2010–2016)
  • 2431 Ionosphere–magnetosphere interactions (2009–2016)
  • 2435 Ionospheric disturbances (2009–2015)
  • 2439 Ionospheric irregularities (2009–2016)
  • 2443 Midlatitude ionosphere (2010–2016)
  • 2447 Modelling and forecasting (2010–2016)
  • 2451 Particle acceleration (2009–2015)
  • 2455 Particle precipitation (2011–2016)
  • 2459 Planetary ionospheres (2011–2013)
  • 2463 Plasma convection (2010–2016)
  • 2467 Plasma temperature and density (2011–2015)
  • 2471 Plasma waves and instabilities (2010–2016)
  • 2475 Polar ionosphere (2010–2015)
  • 2479 Solar radiation and cosmic ray effects (2010–2014)
  • 2483 Wave–particle interactions (2010–2016)
  • 2487 Wave propagation (2010–2016)
  • 2494 Instruments and techniques (2010–2016)
  • 2499 General or miscellaneous (2010–2015)
  • Magnetospheric physics
  • 2704 Auroral phenomena (2010–2016)
  • 2708 Current systems (2010–2016)
  • 2712 Electric fields (2010–2015)
  • 2716 Energetic particles, precipitating (2010–2016)
  • 2720 Energetic particles, trapped (2010–2016)
  • 2724 Magnetopause, cusp, and boundary layers (2009–2016)
  • 2728 Magnetosheath (2009–2016)
  • 2732 Magnetosphere interactions with satellites and rings (2011–2016)
  • 2736 Magnetosphere–ionosphere interactions (2010–2015)
  • 2740 Magnetospheric configuration and dynamics (2010–2016)
  • 2744 Magnetotail (2010–2016)
  • 2748 Magnetotail boundary layers (2010–2014)
  • 2752 MHD waves and instabilities (2010–2016)
  • 2756 Planetary magnetospheres (2010–2015)
  • 2760 Plasma convection (2010–2015)
  • 2764 Plasma sheet (2010–2016)
  • 2768 Plasmasphere (2010–2015)
  • 2772 Plasma waves and instabilities (2010–2016)
  • 2776 Polar cap phenomena (2010–2015)
  • 2780 Solar wind interactions with unmagnetized bodies (2009–2015)
  • 2784 Solar wind–magnetosphere interactions (2009–2016)
  • 2788 Storms and substorms (2010–2016)
  • 2794 Instruments and techniques (2010–2016)
  • 2799 General or miscellaneous (2011–2012)
  • Meteorology and atmospheric dynamics
  • 3304 Atmospheric electricity (2010–2014)
  • 3309 Climatology (2010–2016)
  • 3314 Convective processes (2010–2015)
  • 3319 General circulation (2010–2015)
  • 3324 Lightning (2010–2016)
  • 3329 Mesoscale meteorology (2010–2016)
  • 3334 Middle atmosphere dynamics (2009–2016)
  • 3339 Ocean–atmosphere interactions (2010–2014)
  • 3344 Palaeoclimatology
  • 3349 Polar meteorology (2010–2013)
  • 3354 Precipitation (2010–2016)
  • 3359 Radiative processes (2011–2014)
  • 3364 Synoptic-scale meteorology (2012–2015)
  • 3369 Thermospheric dynamics (2010–2016)
  • 3374 Tropical meteorology (2010–2016)
  • 3379 Turbulence (2010–2015)
  • 3384 Waves and tides (2010–2016)
  • 3394 Instruments and techniques (2010–2016)
  • 3399 General or miscellaneous (2011–2014)
  • Radio science
  • 6904 Atmospheric propagation (2014)
  • 6909 Electromagnetic metrology
  • 6914 Electromagnetic noise and interference
  • 6919 Electro-optics
  • 6924 Interferometry (2014)
  • 6929 Ionospheric physics (2010–2016)
  • 6934 Ionospheric propagation (2011–2016)
  • 6939 Magnetospheric physics (2013–2015)
  • 6944 Nonlinear phenomena
  • 6949 Radar astronomy
  • 6954 Radio astronomy
  • 6959 Radio oceanography
  • 6964 Radio wave propagation (2010–2016)
  • 6969 Remote sensing (2010–2015)
  • 6974 Signal processing (2010–2014)
  • 6979 Space and satellite communication (2010–2013)
  • 6984 Waves in plasma (2010–2014)
  • 6994 Instruments and techniques (2010–2014)
  • 6999 General or miscellaneous
  • Solar physics, astrophysics, and astronomy
  • 7504 Celestial mechanics
  • 7509 Corona and transition region (2010–2015)
  • 7514 Energetic particles (2013–2014)
  • 7519 Flares and mass ejections (2009–2016)
  • 7524 Magnetic fields (2010–2015)
  • 7529 Photosphere and chromosphere (2010–2015)
  • 7534 Radio emissions (2011–2014)
  • 7539 Stellar astronomy
  • 7544 Stellar interiors and dynamo theory
  • 7549 Ultraviolet emissions (2015)
  • 7554 X-rays and gamma rays (2010)
  • 7594 Instruments and techniques (2009)
  • 7599 General or miscellaneous (2010–2014)
  • Space plasma physics
  • 7803 Active perturbation experiments (2011)
  • 7807 Charged particle motion and acceleration (2011–2016)
  • 7811 Discontinuities (2011–2013)
  • 7815 Electrostatic structures (2011–2015)
  • 7819 Experimental and mathematical techniques (2009–2016)
  • 7823 Ionization processes (2011)
  • 7827 Kinetic and MHD theory (2010–2014)
  • 7831 Laboratory studies (2014)
  • 7835 Magnetic reconnection (2009–2016)
  • 7839 Nonlinear phenomena (2009–2016)
  • 7843 Numerical simulation studies (2010–2016)
  • 7847 Radiation processes (2011–2014)
  • 7851 Shock waves (2010–2016)
  • 7855 Spacecraft sheaths, wakes, charging (2012–2013)
  • 7859 Transport processes (2011–2013)
  • 7863 Turbulence (2010–2016)
  • 7867 Wave–particle interactions (2010–2016)
  • 7871 Waves and instabilities (2009–2016)
  • 7875 Wave–wave interactions (2010–2016)
  • 7894 Instruments and techniques (2012–2016)
  • 7899 General or miscellaneous
  • General or miscellaneous
  • 9805 Instruments useful in three or more fields (2011)
  • 9810 New fields (not classifiable under other headings)
  • 9815 Notices and announcements
  • 9820 Techniques applicable in three or more fields (2010–2011)
  • 9900 Corrections