Terms: Transparency of the Ionosphere (17), ionospheric transparency (15),
Terms: ionogram (91,100), ionograms (53,300), vertical ionograms (67), oblique ionograms (1,100), refractive properties of the ionosphere (74), ionospheric physics (77,700), ionospheric propagation (58,100), ionospheric imaging (2,880), ionospheric images (133),
Boolean: satellites +sferics (7,410), site:ecjones.org (522), link:ecjones.org (46), satellite +magnetometers +fluctuations (22,800), geomagnetic +satellite (1,130,000),
Ionospheric Physics of Radio Wave Propagation - In sum, the figure above indicates that as the frequency increases the RF attenuation per unit length increases. Furthermore, the RF attenuation also increases with electrical conductivity s. The implications of these findings include the existence of discrete ranges of frequencies that can reflect off the ionosphere as well as the ability to communicate through sea water using extremely low frequencies (ELF). - ecjones.org
Terms: gps sounding (2,350), ionospheric sounding (61,900), sounding of the ionosphere (1,190), ionosphere monitoring (1,660), ionosphere monitoring facility (11), ionospheric effects (78,100), ionospheric electron density (28,100), ionospheric tec (9,420), ionospheric total electron content (13,900),
Boolean: ionosphere +electromagnetic +reflection (95,100), ionosphere +conductivity +reflection (36,200), ionosphere +electromagnetic +refraction (48,900),
Wikipedia - Skywave, Near Vertical Incidence Skywave, Ground Wave - Surface Wave, Earth's magnetic field, Magsat, Ørsted (satellite),
Frequencies lower than 3 kHz have a wavelength longer than the distance between the Earth and the ionosphere. The maximum usable frequency for skywave propagation is strongly influenced by sunspot number.
Boolean: transparency +(ionosphere OR ionospheric) (37,400), (semitransparency OR "semi-transparency") +(ionosphere OR ionospheric) (36), cosmic +(ionosphere OR ionospheric) (536,000), "propagation modeling" +(ionosphere OR ionospheric) (2,000), "propagation modelling" +(ionosphere OR ionospheric) (1,130), propagation +(ionosphere OR ionospheric) (1,100,000),
Boolean: seismicity +ionosphere (130,000), seismic +ionospheric (96,700),
Ionosphere Monitoring Facility (IONMON)
Terms: nighttime tec data (4), chapman profile model (9), height of maximum electron density (50),
Boolean: ionosphere +3D (219,000), ionosphere +3D (219,000), ionosphere +"electron density" (179,000),
Terms: earthquake prediction (679,000), seismo electromagnetic (9,530), ionospheric precursors of earthquakes (1,120), ionosphere precursor (8), ionospheric disturbances (90,700), earthquake precursors (48,700),
Terms: ionospheric precursor (284),
Terms: semi-transparency (190,000), plasmaspheric transparency (7), radio transparency (2,100),
Terms: thermosphere (673,000), thermospheric (167,000), plasmasphere (183,000), plasmaspheric (53,100),
Terms: ionosphere (3,630,000), ionospheric (2,160,000), ionospheric models (25,100), global ionspheric models (0), ionospheric model (38,000), model of the ionosphere (10,300), models of the ionosphere (1,710), ionospheric prediction (24,600), ionospheric modeling (11,600),
Terms: ionospheric forecasting (1,330), ionospheric characterization (332), ionospheric characterisation (12), ionospheric predictions (1,290), ionospheric simulations (157), ionospheric simulation (376),
TEC Irregularity, Scintillation and Geomagnetic Variations Associated with the 28 March 2005 Sumatran Earthquake - from http://www.ies2008.com/