Showing papers on "TEC published in 1974"
TL;DR: In this paper, a model calculation was performed for the specific case of 1 November 1968 using simultaneous Alouette I data to define the position and magnitude of the ionospheric trough and the results indicated that the motion of a deep trough across the ray path from a geostationary satellite to an observing station can cause drastic changes in the measured amounts of Faraday rotation and therefore in the derived values of TEC.
35 citations
06 Feb 1974
TL;DR: In this article, the ionospheric response to 75 geomagnetic storms has been examined using total electron content (TEC) data obtained at Hamilton, Massachusetts (426N, 708W) Simultaneous measurements of the F2-region critical frequency and equivalent slab thickness (tau = TEC/N(max)) to be monitored during the same events.
Abstract: : The ionospheric response to 75 geomagnetic storms has been examined using total electron content (TEC) data obtained at Hamilton, Massachusetts (426N, 708W) Simultaneous measurements of the F2-region critical frequency (N(max)) and equivalent slab thickness (tau = TEC/N(max)) to be monitored during the same events Both graphical and tabulated formats were used to present the response of the parameters for five days of each storm period This broad data base should provide a unique source for examining the variety of possible storm effects, for testing storm models, and for comparison with the storm effects observed at other locations (Author)
24 citations
TL;DR: In this paper, the appearance of nocturnal winter and evening summer maximum at Lindau has been studied in detail utilizing TEC measurements, obtained from the satellite S-66 transmissions over the period 1964 to 1968, and the foF2 values.
20 citations
TL;DR: In this article, an average storm time behavior of the ionospheric total electron content (TEC) for middle latitudes was deduced for magnetic storms, and a longitudinal effect in the behaviour of both the storm time and diurnal components of disturbed TEC was found.
Abstract: IN a previous study1 of the response of the ionospheric total electron content (TEC) data to magnetic storms, an average storm time behaviour of TEC for middle latitudes was deduced. On average TEC is enhanced during the first 24 h following the start of a storm, depressed for the next 24 h and near normal through the third 24 h. Another study2 has shown a strong diurnal component in TEC behaviour with the maximum enhancement occurring in the dusk sector (1600 to 1800 LT). The present study of disturbed TEC behaviour generally agrees with that reported above but in addition indicates a longitudinal effect in the behaviour of both the storm time and diurnal components of disturbed TEC.
6 citations
28 Jun 1974
TL;DR: In this paper, measurements of total ionospheric electron content (TEC) by Faraday rotation of radio waves are given for the period November 1967 to September 1973 for 136 MHz transmissions from the geostationary satellite ATS-3 observed at a sub-ionospheric invariant latitude of 54 degrees N.
Abstract: : Measurements of total ionospheric electron content (TEC) by Faraday rotation of radio waves are given for the period November 1967 to September 1973 for 136 MHz transmissions from the geostationary satellite ATS-3 observed at a sub-ionospheric invariant latitude of 54 degrees N The diurnal curves showed the effects of solar radiation and particle precipitation (Modified author abstract)
5 citations
01 Jun 1974
TL;DR: The major factors influencing the outcome of the TEC evaluation were: command emphasis, ongoing training programs, verbal ability, and uneven quality and distribution of certain TEC lessons within a particular MOS 11B40 Evaluation test area.
Abstract: : The project was intended primarily to evaluate the effectiveness of a Training Extension Course (TEC) as a means of increasing the Military Occupational Specialty (MOS) proficiency of Army personnel. TEC (utilizing sound/slide as the basic media for 56 lessons) was implemented by the Combat Arms Training Board. Training material relevant to MOS 11B40 (Light Weapons Infantryman) was developed by various departments within the U.S. Army Infantry School and distributed to Active Army and National Guard Units. Among the major factors influencing the outcome of the TEC evaluation were: command emphasis, ongoing training programs, verbal ability, and uneven quality and distribution of certain TEC lessons within a particular MOS 11B40 Evaluation test area. (Modified author abstract)
1 citations