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Journal of Atmospheric and Solar-Terrestrial Physics | 1984

Millstone Hill measurements on 26 February 1979 during the solar eclipse and formation of a midday F-region trough☆

J. M. Holt; R. H. Wand; J. V. Evans

On 26 February 1979, the Millstone Hill incoherent scatter radar was operated to observe the F-region over Canada along the path of the total eclipse of the sun. A continuous scanning mode was used with the radar elevation fixed at 4° and the azimuth swept continuously from 350° to 298°. Each scan required 20 min to complete and useful results were obtained at ranges up to 2992 km. The path of totality crossed the center of the region swept by the radar beam. The F-region electron density, ion temperature, electron temperature and ion line-of-sight drift were measured. Electric field components have been extracted from the radar line-of-sight component of the ion drift by assuming that the electric field may be represented by a quasi-static two-dimensional potential with the potential assumed constant along geomagnetic field lines. Electron density decreases were observed in association with the eclipse. At 300 km an ∼50% decrease occurred near the region of totality, but the variations were small above 450 km. However, apparently unrelated to the eclipse, very large electric fields developed in the region under view. Somewhat later a well defined trough formed north of Λ = 70°, whose equatorward edge is extremely sharp and appears to be approaching the radar with time. Large values of the electron and ion temperatures were observed in the trough and the trough formed where the drift was westwards and exceeded 1000 m s−1. It is suggested that the observed through may be due to an increase in the rate of the charge transfer reaction O+ + N2 → NO+ + N in the presence of a very large electric field impressed from the magnetosphere in association with a large magnetic disturbance.


Journal of Geophysical Research | 1983

F region ion temperature enhancements resulting from Joule heating

Murray J. Baron; R. H. Wand


Journal of Geophysical Research | 1980

Millstone hill incoherent scatter observations of auroral convection over 60° ≤Λ ≤75° 2. Initial results

J. V. Evans; J. M. Holt; W.L. Oliver; R. H. Wand


Journal of Geophysical Research | 1987

Empirical models for the plasma convection at high latitudes from Millstone Hill observations

J. M. Holt; R. H. Wand; J. V. Evans; W. L. Oliver


Journal of Geophysical Research | 1983

Millstone Hill incoherent scatter observations of auroral convection over 60° < Λ < 75°: 3. Average patterns versus Kp

W. L. Oliver; J. M. Holt; R. H. Wand; J. V. Evans


Journal of Geophysical Research | 1983

The Fossil Theory of nighttime high latitude F region troughs

J. V. Evans; J. M. Holt; W. L. Oliver; R. H. Wand


Journal of Geophysical Research | 1981

Seasonal and magnetic activity variations of ionospheric electric fields over Millstone Hill

R. H. Wand; J. V. Evans


Journal of Geophysical Research | 1983

Geomagnetic activity effects on semidiurnal winds in the lower thermosphere

R. H. Wand


Journal of Geophysical Research | 1979

Millstone Hill incoherent scatter observations of auroral convection over 60° ≤Λ≤75°, 1. Observing and data reduction procedures

J. V. Evans; J. M. Holt; R. H. Wand


Journal of Geophysical Research | 1981

The penetration of convection electric fields to the latitude of Millstone Hill (Λ=56°)

R. H. Wand; J. V. Evans

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J. V. Evans

Massachusetts Institute of Technology

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J. M. Holt

Massachusetts Institute of Technology

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John M. Holt

Massachusetts Institute of Technology

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W.L. Oliver

Massachusetts Institute of Technology

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