Tor Hagfors
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Norwegian physicist
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Physics
Why Is Tor Hagfors Influential?
(Suggest an Edit or Addition)According to Wikipedia, Tor Hagfors was a Norwegian scientist, radio astronomer, radar expert and a pioneer in the studies of the interactions between electromagnetic waves and plasma. In the early 1960s he was one of a handful of pioneering theorists that independently developed a theory that explained the scattering of radio waves by the free electrons in a plasma and applied the result to the ionosphere. He became founding director of the new EISCAT facilities that were then under construction in 1975, by which time he already been director at most of the other incoherent scatter radar facilities in the world. The asteroid 1985 VD1 is named 7279 Hagfors after him.
Tor Hagfors's Published Works
Number of citations in a given year to any of this author's works
Total number of citations to an author for the works they published in a given year. This highlights publication of the most important work(s) by the author
Published Works
- Radar Soundings of the Subsurface of Mars (2005) (336)
- Subsurface Radar Sounding of the South Polar Layered Deposits of Mars (2007) (313)
- EISCAT: An updated description of technical characteristics and operational capabilities (1983) (254)
- Backscattering from an undulating surface with applications to radar returns from the Moon (1964) (202)
- Methods for the measurement of vertical ionospheric motions near the magnetic equator by incoherent scattering (1969) (154)
- Remote Probing of the Moon by Infrared and Microwave Emissions and by Radar (1970) (144)
- The Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT): A Short Description of the Instrument and of the Commissioning Stages (2007) (130)
- Density fluctuations in a plasma in a magnetic field, with applications to the ionosphere (1961) (125)
- Comet nucleus sounding experiment by radiowave transmission (1998) (95)
- Note on the effect of shadowing on the backscattering of waves from a random rough surface (1966) (87)
- Observations of enhanced plasma lines by EISCAT during heating experiments (1983) (75)
- High‐latitude HF‐induced airglow displaced equatorwards of the pump beam (2000) (74)
- Measurements of HF‐enhanced plasma and ion lines at EISCAT with high‐altitude resolution (2000) (70)
- Relationship of geometric optics and autocorrelation approaches to the analysis of lunar and planetary radar (1966) (66)
- Some properties of radio waves reflected from the Moon and their relation to the lunar surface (1961) (61)
- Evidence for the existence of nighttime F-region polarization fields at Arecibo (1974) (58)
- High-Latitude Space Plasma Physics (1983) (55)
- Interferometric observations of filamentary structures associated with plasma instability in the auroral ionosphere (2003) (55)
- High‐latitude pump‐induced optical emissions for frequencies close to the third electron gyro‐harmonic (2002) (54)
- Aspect angle dependence of HF enhanced incoherent backscatter (1999) (53)
- MaRS: Mars Express Orbiter Radio Science (2004) (53)
- A Theory of Collision Dominated Electron Density Fluctuations in a Plasma with Applications to Incoherent Scattering (1971) (52)
- Study of radio echoes from the Moon at 23 centimeters wavelength (1966) (50)
- New phenomena observed by EISCAT during an RF ionospheric modification experiment (1990) (47)
- Tenuous Surface Layer on the Moon: Evidence Derived from Radar Observations (1965) (46)
- Interferometric radar observations of filamented structures due to plasma instabilities and their relation to dynamic auroral rays (2004) (45)
- Artificial optical emissions in the high-latitude thermosphere induced by powerful radio waves: An observational review (2007) (45)
- Electron temperature derived from incoherent scatter radar observations of the plasma line frequency (1981) (42)
- THE EARTH'S IONOSPHERE: A WALL-LESS PLASMA LABORATORY (1997) (42)
- Measurement of three‐dimensional plasma velocities at the Arecibo Observatory (1974) (41)
- Note on the scattering of electromagnetic waves from charged dust particles in a plasma (1992) (41)
- On the electron distribution function in the F region and airglow enhancements during HF modification experiments (2000) (38)
- On the interpretation of radar reflections from the Moon (1964) (38)
- Self-oscillations and bunching of striations in ionospheric modifications (1998) (38)
- Cavitating Langmuir Turbulence Observed during High-Latitude Ionospheric Wave Interaction Experiments (1999) (37)
- The Arecibo upgrading: electrical design and expected performance of the dual-reflector feed system (1994) (36)
- First 100 ms of HF modification at Tromsø, Norway (2004) (36)
- Incoherent scatter radar observations of the plasma line with a chirped pulse system (1982) (35)
- A characterization of a comet nucleus interior:: inversion of simulated radio frequency data (1999) (34)
- Dynamic rayed aurora and enhanced ion-acoustic radar echoes (2005) (34)
- Nonlinear structuring of the ionosphere modified by powerful radio waves at low latitudes (1999) (33)
- HF-pump-induced parametric instabilities in the auroral E-region (2002) (32)
- Dielectric properties of the Martian south polar layered deposits: MARSIS data inversion using Bayesian inference and genetic algorithm (2008) (31)
- A new digital all-sky imager experiment for optical auroral studies in conjunction with the Scandinavian twin auroral radar experiment (1998) (31)
- High-resolution maps of the characteristic energy of precipitating auroral particles (2001) (31)
- On origin of outshifted plasma lines during HF modification experiments (1997) (29)
- Observations of small-scale plasma density depletions in arecibo HF heating experiments (1987) (29)
- Mapping of planetary surfaces by radar (1973) (28)
- Refraction scattering as origin of the anomalous radar returns of Jupiter's satellites (1985) (26)
- The CONSERT instrument for the ROSETTA mission (1999) (25)
- Recent EISCAT heating results using chirped ISR (1996) (25)
- A generation mechanism for topside enhanced incoherent backscatter during high frequency modification experiments in Tromsø (2001) (24)
- Aperture synthesis in radar astronomy and some applications to lunar and planetary studies (1968) (24)
- Observations of the temporal and spatial development of induced and natural plasma lines during HF modification experiments at Arecibo using chirped incoherent scatter radar (1993) (24)
- Stable electron density fluctuations in a plasma in the presence of a high‐frequency electric field (1972) (22)
- Electron temperature measurements by the plasma line technique at the French Incoherent Scatter Radar Facilities (1981) (22)
- Electromagnetic wave propagation in a field-aligned-striated cold magnetoplasma with application to the ionosphere (1984) (22)
- Observational technique and parameter estimation in plasma line spectrum observations of the ionosphere by chirped incoherent scatter radar (1986) (22)
- Distortion of radar pulses by the Martian ionosphere (2003) (22)
- A search for the location of the HF excitation of enhanced ion acoustic and langmuir waves with eiscat and the tromsø heater (1999) (20)
- Mapping of overspread targets in radar astronomy (1991) (20)
- Analysis of a cluster feed for the Arecibo tri-reflector system using forward ray-tracing and aperture integration (1993) (19)
- An interferometer experiment to explore the aspect angle dependence of stimulated electromagnetic emission spectra (2005) (19)
- VHF parabolic cylinder antenna for incoherent scatter radar research (1982) (18)
- A new method for accurate ionospheric electron density measurements by incoherent scatter radar (1984) (18)
- Extrapolating EISCAT Pedersen conductances to other parts of the sky using ground-based TV auroral images (1998) (18)
- The high-latitude artificial aurora of 21 February 1999: An analysis (2002) (18)
- Development of a dual-reflector feed for the Arecibo radio telescope: an overview (1991) (18)
- Refraction Scattering in the Anomalous Reflections from Icy Surfaces (1997) (17)
- A comparison of thermospheric winds and temperatures from Fabry-Perot Interferometer and EISCAT Radar measurements with models (2000) (17)
- , Layered Deposits of Mars Subsurface Radar Sounding of the South Polar (2010) (15)
- Directional features of the downshifted peak observed in HF-induced stimulated electromagnetic emission spectra obtained using an interferometer (2006) (14)
- MARSIS data inversion approach: Preliminary results (2008) (13)
- Electron temperature measurements by incoherent scattering in the presence of strong small scale temperature irregularities (1998) (13)
- SIMULTANEOUS OBSERVATION OF PROTON PRECIPITATION AND AURORAL RADAR ECHOES. (1971) (12)
- Comment on radar scattering from Saturn's rings (1974) (12)
- Determination of the Albedo of the Moon at a Wavelength of 6 in (1969) (11)
- Earth's Ionosphere (2001) (11)
- On heat flow contribution to plasma line frequency in the F region (1994) (10)
- A comparison of vertical thermospheric winds from Fabry-Perot interferometer measurements over a 50 km baseline (2000) (10)
- Plasma fluctuations excited by charged particle motion and their detection by weak scattering of radio waves (1997) (10)
- The “long wavelength radar” on the Mars-94 orbiter (1995) (10)
- Ionospheric Research in the European Auroral zone by Incoherent Scatter Techniques (1976) (10)
- Incoherent scatter radar observations. (1977) (9)
- Plans for a new rio-imager experiment in Northern Scandinavia (1997) (9)
- The EISCAT Facility (1983) (9)
- A new imaging riometer based on mills cross technique (2003) (8)
- SCATTERING AND TRANSMISSION OF ELECTROMAGNETIC WAVES AT A STATISTICALLY ROUGH BOUNDARY BETWEEN TWO DIELECTRIC MEDIA (1967) (8)
- Detection and estimation practices in radio and radar astronomy (1970) (8)
- Excitation of heater-enhanced plasma and ion lines near the reflection level of a high-frequency pump wave (2001) (8)
- Effect of electrojet irregularities on DC current flow (2006) (8)
- A new Fabry-Perot interferometer experiment for neutral atmosphere studies in conjunction with the EISCAT incoherent-backscatter radar system (1997) (7)
- A new Fabry-Perot interferometer for atmospheric studies with the EISCAT incoherent radar (1997) (7)
- The COmet Nucleus Sounding Experiment by Radio-wave Transmission (CONSERT) (2009) (7)
- Observations of enhanced ion line frequency spectrum during Arecibo ionospheric modification experiment (1974) (7)
- Microwave Studies of Thermal Emission from the Moon (1971) (7)
- A new Digital All Sky Imager (DASI) experiment for optical auroral studies in conjunction with the STARE coherent radar system (1996) (6)
- Cometary surface layer properties: Possible approaches to radio sounding retrieval during the CONSERT experiment—Numerical simulation and discussion (2003) (6)
- The Effect of roughness on the polarization of thermal emission from a surface (1965) (6)
- Soviet ionospheric modification research (1988) (6)
- The relationship between small-scale and large-scale ionospheric electron density irregularities generated by powerful HF electromagnetic waves at high latitudes (2006) (6)
- Performance comparison of cross correlation and filled aperture imaging riometers (2003) (5)
- Past applications and future uses of chirped ISR plasma line observations (1989) (5)
- 2.1. The Ionosphere (1976) (5)
- Extrapolating EISCAT height-integrated Pedersen conductivites to other parts of the sky using ground-based TV auroral images (1998) (5)
- Kinetic theory of density fluctuations in a magnetized collision‐dominated plasma in an electric field (1972) (5)
- Electrostatic parametric resonances in a plasma revisited (1996) (5)
- Novel Fabry‐Perot interferometer measurements of F‐region ion temperature (2003) (4)
- Incoherent scatter radar observations of the ionosphere (1989) (4)
- INFORMATION CAPACITY AND QUANTUM EFFECTS IN PROPAGATION CIRCUITS (1964) (4)
- Two-dimensional chirp mapping of delay and Doppler spread targets (1991) (4)
- Ground penetrating radar for planetary exploration (1998) (4)
- Advanced Rio-Imaging Experiment in Scandinavia (ARIES): System specification and scientific goals (2005) (4)
- Conductivity of a Weakly Ionized Plasma as Related to Particle Diffusion in μ Space (1970) (4)
- Observations of angle of arrival of meteor echoes in v.h.f. forward scatter propagation (1958) (3)
- MEASUREMENT OF PROPERTIES OF SPREAD CHANNELS BY THE TWO-FREQUENCY METHOD WITH APPLICATION TO RADAR ASTRONOMY (1965) (3)
- A RADAR INTERFEROMETER STUDY OF VENUS AT 3.8 CM (1968) (3)
- Radio interferometry by lunar reflections (1990) (3)
- Search for light ion outflow by incoherent scatter radar (2001) (2)
- Incoherent Scattering of Radio Waves as a Method of Studying the Ionosphere (1962) (2)
- The arecibo observatory upgrading program (1986) (2)
- Commission 2: Progress in Radio and Non‐Ionized Media (1969) (2)
- Development of a dual-reflector feed for the radiotelescope in Arecibo. An overview (1991) (2)
- Asteroid Exploration Mission (ASTEREX), Assessment Study (1979) (2)
- Application of Viking radio occultation data to the future studies of the Martian ionosphere (1998) (2)
- Time-varying propagation circuits, description and applications (2001) (2)
- Discussion of paper by F. L. Scarf, ‘Effect of coherent density fluctuations on the radar determination of total electron content’ (1967) (2)
- High latitude artificial aurora from EISCAT: An unique phenomenon? (2001) (1)
- HF induced airglow: Double patches! (2000) (1)
- Correction to "Mapping of overspread targets in radar astronomy" (1992) (1)
- Parametric resonances revisited: comparison with kinetic description (2005) (1)
- EISCAT first plasma line experiment (1982) (1)
- Direct calculation of f-region joule heating from simultaneous ion and neutral measurements at high latitudes (2000) (1)
- Simultaneous variation of amplitude and phase of Gaussian noise, with applications to ionospheric forward-scatter signals (1958) (1)
- High-latitude artificial aurora using the EISCAT high-gain HF facility (2002) (1)
- Note on quantum effects in radiometer observations (1964) (1)
- The Icy Galilean Satellites: New Radar Results (1988) (1)
- Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT)for ROSETTA Mission (1996) (1)
- Ion-neutral coupling in the high-latitude F-layer from incoherent scatter and Fabry-Perot measurements (2000) (1)
- Estimation of Mars Ionosphere Total Electron Content Using MARSIS Radar Surface Echo (2006) (0)
- Comment on paper by A. K. Fung and R. K. Moore, ‘The correlation function in Kirchhoff's method of solution of scattering of waves from statistically rough surfaces’ (1966) (0)
- Report from the International Workshop on Remote Sensing in Geophysics Using Doppler Techniques (1998) (0)
- Thoughts on radio wave experiments for observations of the interior of comets in the international ROSETTA mission (1995) (0)
- Polar layered deposits of Mars as seen by MRO/SHARAD (2007) (0)
- Two‐dimensional tomography in a statistically homogeneous medium (1997) (0)
- Kristian Schlegel: His Contributions To The Physics of The Ionosphere (2002) (0)
- DETECTING NARROW, FIELD-ALIGNED SPATIAL STRUCTURES IN THE AURORALIONOSPHERE USING THE EISCAT SVALBARD RADAR DUAL ANTENNAS AS ANINTERFEROMETER (2002) (0)
- Sir Granville Beynon and EISCAT (1994) (0)
- Study of a feed cluster for the Gregorian dual-reflector feed of the Arecibo radio telescope (1992) (0)
- Combined EISCAT and Fabry-Perot Interferometer Measurements of Ionospheric-Thermospheric Coupling (2000) (0)
- Cylindrical VHF reflector antenna for incoherent scatter radar observations in northern Europe (1980) (0)
- Basin infills at Ma'adim Vallis as seen by MARSIS subsurface sounding radar (2007) (0)
- Measurement of electric fields in the ionosphere by incoherent scatter radar techniques (1982) (0)
- The long wavelength radar for Mars surface and ionosphere probing (1997) (0)
- EXCITATION OF PLASMA WAVES IN A MIDDLE-SIZE CAVITY NEAR THE REFLECTION LEVEL OF A HF PUMP WAVE (2002) (0)
- Arecibo Ground Screen Performance Measurements (1993) (0)
- The morphology of auroral optical emissions, riometer absorption and energy of the precipitating particles (1998) (0)
- Backscattering simulations from the Martian surface and subsurface in the case of the MARSIS radar sounder. (2003) (0)
- Observations of direction of arrival of long-duration meteor echoes in forward scatter propagation (1959) (0)
- Report from the I}nternational {W}orkshop on {R}emote {S}ensing in {G}eophysics {U}sing {D}oppler {Techniques (1998) (0)
- Incoherent Scatter Radar in Ionospheric Research: Past Contribution and Future Promise (2006) (0)
- Foreword, Seventh EISCAT Workshop (1997) (0)
- Radar Properties of the Moon (1966) (0)
- Diagnostics of ionospheric parameters by the incoherent scatter method using linear-FM signals (1992) (0)
- 50 years of ionospheric research at the Max-Planck-Institut für Aeronomie (1996) (0)
- Marsis Data Inversion Approach: Preliminary Results on Mars South Polar Region (2007) (0)
- Planned major improvements to the Arecibo telescope (1989) (0)
- Need for a subtropical wind profiling system (1986) (0)
- The CONSERT experiment for the ROSETTA mission (1997) (0)
- A test of Radio Interferometry by Lunar reflection (1991) (0)
- Low Electron Temperature Region around the Dayside Cusp Observed with ESR (2001) (0)
- Space Science Research in Norway - a Critial Evaluation (1994) (0)
- Feed system for the EISCAT VHF parabolic cylinder antenna (1980) (0)
- Discussion of radio wave propagation experiments to explore the earth's magnetosphere (1966) (0)
- The MPAE Fabry-Perot interferometer for neutral atmosphere and ionosphere interaction studies with EISCAT (1998) (0)
- Preliminary results of studies of the angular distribution of a VHF ionospheric forward scatter signal (1958) (0)
- Comments on letter by A. K. Fung, R. K. Moore, and B. E. Parkins, “Notes on backscattering and depolarization by gently undulating surfaces” (1965) (0)
- On the forward scattering of radio waves in the lower ionosphere (1962) (0)
- The scattering of electromagnetic waves from density fluctuations in a plasma. (1977) (0)
- Spacecraft radar experiment for observations of the interior of a comet in the ROSETTA mission (1995) (0)
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