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MacKenzie, Eileen

Works: 17 works in 29 publications in 1 language and 434 library holdings
Genres: Popular works 
Roles: Author
Classifications: RC560.I45, 616.692
Publication Timeline
Publications about Eileen MacKenzie
Publications by Eileen MacKenzie
Most widely held works by Eileen MacKenzie
It's not all in your head : a couple's guide to overcoming impotence by Bruce MacKenzie( Book )
3 editions published between 1988 and 1991 in English and held by 244 libraries worldwide
The Findlater sisters; literature & friendship by Eileen MacKenzie( Book )
9 editions published in 1964 in English and held by 149 libraries worldwide
Ionospheric scintillations/TEC and in-situ density measurements at an auroral location in the European sector by Eileen MacKenzie( Book )
2 editions published in 1987 in English and held by 20 libraries worldwide
The orbiting HiLat satellite launched in 1983 offered an opportunity for studying ionospheric scintillation parameters in relation to in-situ measurements of ionization density, drift velocity, field-aligned current, and particle precipitation during the sunspot minimum period. This report discusses results of a morphological study based on observations of scintillations and total electron content (TEC) at the auroral oval station at Tromso, Norway, during the period Dec 1983 - Oct 1985. The geometrical enhancement of scintillations observed during alignment of the propagation with the local magnetic L-shell is shown to be the most consistent and conspicuous feature of scintillations in the nighttime auroral oval. The dynamics of the spatial and temporal extent of this region are illustrated in the invariant latitude/magnetic local time grid. Steepening of phase spectral slope in the geometrical enhancement region is indicative of the presence of L-shell aligned sheet-like irregularities at long scale lengths. The seasonal variation of TEC determined from the differential Doppler measurements of HiLat transmissions is discussed in relation to the in-situ density measurements at 830 km. The results are also used to illustrate the dependence of ionospheric structure parameters on short-term variability of solar activity during the sunspot minimum period. This study provides an insight into the nature of magnetospheric coupling with the ionosphere at high latitudes. (edc)
Literature & friendship by Eileen MacKenzie( Book )
1 edition published in 1964 in Undetermined and held by 5 libraries worldwide
An evaluation of a day care centre as part of a community service centre by Rosemary Faulkner( Book )
1 edition published in 1971 in English and held by 2 libraries worldwide
Scintillation and In-situ Irregularity Parameters in the Auroral Oval and Polar Cap by Eileen MacKenzie( Book )
2 editions published in 1990 in English and held by 2 libraries worldwide
The orbiting HiLat satellite launched by the Defense Nuclear Agency in 1983 offered a unique opportunity for studying ionospheric scintillation parameters in relation to in-situ irregularity parameters. An earlier report (AFGL-TR-87-0245) summarized our findings during the sunspot minimum period of 1983-1985 for data obtained at Tromso, Norway. In this report, we extend our study to the sunspot maximum period of 1988-1989. For completeness, we augment the HiLat scintillation data by phase and amplitude scintillation morphology obtained with the help of the quasi-geostationary polar beacon satellites at Tromso during the period 1988 to 1990. To contrast these two distinct high latitude regions, we provide scintillation morphology using polar beacon satellites from Thule, Greenland for the period 1987 to 1990. Some new findings emerge on the UT and seasonal variation of high latitude scintillation as a result of this study
Study and Analysis of Total Electron Content and Scintillation Data ( Book )
1 edition published in 1976 in English and held by 1 library worldwide
This report embodies a study of Ionospheric Scintillations as considered from the following aspects: 1) Overall view of scintillations using a large data base, and also the detailed, individual magnetic storm picture. Solar flux level, seasonal variation, invariant latitude, and irregularity region are discussed. 2) Total Electron Content measurements through Faraday Rotation and Group Delay Methods. Results of employment of these techniques are discussed. The M-factor, for conversion of Faraday Rotation angles is studied, and associated use of it is displayed through a program for which documentation is included. 3) Characteristics of scintillations in the weak and strong scatter regimes. Results of the frequency dependence of scintillations, power spectra, and autocorrelation of amplitude fluctuations are discussed. 4) Daytime VHF scintillations. Type 1, type 2, and E sub sq irregularities are discussed. 5) A modification to the Signal Analysis Package, previously developed, is described. Application for use on the CDC 6600. (Author)
Ionospheric Irregularities: Source, Structure, Plasma Processes and Effects on Sensor Systems ( Book )
1 edition published in 1989 in English and held by 1 library worldwide
A multi-technique approach has been used at a number of geophysically interesting locations to determine various sources of high-latitude irregularities, their occurrence characteristics and effects on sensor systems. Auroral scintillation morphology and irregularity anisotropy were determined using HiLat satellite data obtained at Tromso. Global scintillation characteristics were determined as a function of the sunspot cycle and a high latitude scintillation review was prepared reflecting our improved understanding of different sources of irregularity generation. A high latitude campaign mounted under the auspices of the CEDAR initiative provided multiple diagnostic studies of the polar cusp, polar cap patches and sun-aligned arcs. Multiple sensor data on the DE-2 satellite have been utilized to isolate two different classes of plasma instabilities responsible for structuring plasma at high latitudes. Finally, an active experiment was performed with the high power HF heater at Tromso, Norway to study the characteristics of the artificially generated irregularities in the daytime sub-auroral ionosphere. (JHD)
Phase and amplitude scintillation statistics at 244 MHz from Goose Bay using a geostationary satellite ( Book )
1 edition published in 1982 in English and held by 1 library worldwide
Phase and amplitude scintillation measurements made at 244 MHz from Goose Bay using the geostationary satellite Fleetsat are presented. An extended dynamic range receiver with an extremely stable local oscillator measured the phase variations with the precision of a coherent system subject to certain limitations. The data were obtained for a 10-month period in 1979 during a high sunspot epoch to extend the limited temporal coverage of the orbiting Wideband satellite data. The report presents scintillation statistics in the manner required for communications system planning. The nighttime phase scintillations showed maximum occurrence during the spring and increased greatly in relation to the amplitude scintillations during times of significant magnetic activity. The increase of phase scintillations in relation to amplitude scintillations was attributed to an enhanced ionospheric drift during times of magnetic disturbances. The phase spectral index of the Fleetsat data was found to be larger than that determined from Wideband data. To further our understanding of auroral irregularity generation mechanisms, this report also presents a case study of energetic particle precipitation spectra, the topside thermal density response of such precipitation and the coordinated phase and amplitude perturbation spectra created by such an energy input into the ionosphere
Analyze and Study Ionospheric Scintillation and Total Electron Content Variability (Ionospheric Studies and TEC Variations) ( Book )
1 edition published in 1981 in English and held by 1 library worldwide
Ionospheric scintillation analyses have been conducted on several fronts, and are discussed here in the light of: (1) recent observations, current theories, and coordinated studies of equatorial scintillations; (2) morphology and analytical formulas at high latitudes; (3) measurements associated with ionospheric heating. F-region irregularities are viewed from the concepts of localized origin of patches, in-situ spectral measurements, and coexistence of km- and m-scale irregularities. The dynamics of equatorial patch formation, motion, and decay are also discussed. Generation of irregularities during underdense heating was observed for the first time. Total electron content data have been utilized to derive the statistics of the variability of ionospheric time delay in the Mediterranean region for the current solar maximum period. The implications of the results on modern satellite ranging systems are discussed. (Author)
Variation of Equatorial F-Region Irregularity Parameters as a Function of Solar Activity ( Book )
1 edition published in 1982 in English and held by 1 library worldwide
The Air Force Geophysics Laboratory in collaboration with the Geophysical Institute of Peru and the University of Texas at Dallas performed co-ordinated measurements of nighttime F-region irregularities near the magnetic equator during 1975-1979. A variety of techniques, such as ionospheric soundings, scintillation, airglow, VHF radar backscatter and satellite in-situ density probes, were employed to study the F-region irregularities over a wide scale-length range from tens of kilometers to a few meters. The dynamics of the irregularity structures were explored by the Airborne Ionospheric Observatory on the Air Force Geophysics Laboratory as well as by the spaced receiver scintillation measurements performed on the ground. This report compiles some of these measurements with a view to studying the variation of the irregularity characteristics with changes in solar activity that occurred during the campaign periods in the years 1975-1979. (Author)
Multi-Technique Study of Ionospheric Structures Causing Degradation in Trans-Ionospheric Communications Systems ( Book )
1 edition published in 1987 in English and held by 1 library worldwide
Multiple diagnostics have been used at different latitude regimes of the globe to probe large and small scale ionospheric structures which cause degradation in trans-ionospheric communication systems. It was determined that the equatorial anomaly crest had the most disturbed F-region irregularity environment giving rise to saturated GHz scintillation and phase scintillations as large as 16 radians at 244 MHz. At the magnetic equator a host of techniques during the Project Condor rocket campaign in Peru established that the largest GHz scintillat ions maximize in association with extended 3m backscatter plane structures and that speed-receiver scintillation measurements yield irregularity drift velocitiers in fairly good agreement with the 50 MHz radar interferometer drifts. By combining in-situ data of irregularities with scintillations, a new class of extended VHF scintillation producing irregularities was isolated known as bottomside sinusoidal. (Author)
Global Ionospheric Processes ( Book )
1 edition published in 2008 in English and held by 1 library worldwide
The Global Ionospheric Processes basic research task has focused on three core areas: the equatorial ionosphere, the polar ionosphere, and active experiments. In equatorial ionospheric research, the group concluded work on previous solar maximum experiments including the Conjugate Points Experiment (COPEX), made preparatory investigations for C/NOFSA satellite mission, and carried out initial research with the satellite after launch. In the high latitudes, a chain of stations across the polar cap was completed with the installation of instruments at Station Nord, Greenland, to observe the formation and evolution of polar cap patches and scintillation-producing irregularities. Significant progress was made in understanding substorm plasma injections as they relate to subauroral plasma streams and other phenomena near the plasmasphere boundary. A number of advances were made in active experiments, especially with the HAARP facility. This included reproduction of artificial optical emissions from the E layer, quantitative determination of optical emission generation efficiency, and investigations into naturally occurring subauroral precipitation structures that could prove useful for controlled particle precipitation experiments. We also detail a number of technology transitions resulting from this research
Study and Analysis of Equatorial Irregularities, Total Electron Content, and Scintillations ( Book )
1 edition published in 1978 in English and held by 1 library worldwide
The following are among the topics studied. (1) The nature of electrojet irregularities responsible for daytime VHF scintillations in the equatorial region. The times of onset and decay of VHF scintillations are shown to correspond closely with the times of onset and decay of type 2 irregularities deflected by 50 MHz radar and E sub sq echoes on ionograms. (2) The spatial localization of nighttime irregularities detected by scintillation and VHF radar backscatter measurement; (3) The kilometer and meter scale irregularities in the night-time equatorial F-region giving rise to VHF-UHF scintillations and VHF radar backscatter; (4) Modelling of equatorial and high latitude scintillations using a large data base, and also the detailed, individual magnetic storm picture; (5) The variability of total electron content (TEC) as it limits the accuracy of satellite navigation and satellite detection radar systems as well as the correlation distance of TEC variability. The results of plasmaspheric electron content are presented and its importance in the determination of additional ionspheric group delay is assessed
Comparison of ionospheric scintillation statistics from the North Atlantic and Alaskan sectors of the auroral oval using the Wideband satellite ( file )
1 edition published in 1981 in English and held by 0 libraries worldwide
Phase and amplitude scintillation measurements made at 138 MHz at two widely separated auroral stations, Goose Bay, Labrador, and Anchorage, Alaska, are presented. The phase coherent transmissions obtained from the sun- synchronous Wideband satellite were used for this purpose. The data were obtained for part of the year 1979 during a high sunspot epoch and was terminated by the failure of the Wideband satellite in August, 1979. The primary objective of the report is the presentation of scintillation statistics in a manner required for communications system planning. The morphology at the two stations was found to be significantly different with more nighttime scintillations observed at Goose Bay, while many more daytime scintillations were observed at Anchorage during the same season. The report establishes the existence of L-shell aligned sheets in the daytime in addition to the well- established similar geometry at night. The existence of sheetlike irregularities during the daytime well-equatorward of the auroral oval is significant both from modeling and physical standpoints. (Author)
Near-Simultaneous Plasma Structuring in the Midlatitude and Equatorial Ionosphere During Magnetic Superstorms ( file )
1 edition published in 2005 in English and held by 0 libraries worldwide
Near simultaneous formation of ionospheric plasma density structures at middle and equatorial latitudes during the intense magnetic storms of October 29-31, 2003; July 15, 2000; and March 30-31, 2001 is investigated. The evolution of these structures is explored by measuring amplitude scintillation of satellite signals at 250 MHz, determining zonal irregularity drifts and by detecting equatorial plasma bubbles with DMSP satellites. During abrupt decreases of SYM-H (1-minute resolution Dst) that signify the penetration of high latitude electric fields, an impulsive onset of scintillation occured at Hanscom 4FB (HAFB), a sub-auroral location, as well as in the equatorial region where the early evening period corresponds to the time of scintillation onset at midlatitudes. The onset of equatorial scintillation is delayed from that at midlatitudes by about 20 minutes, which can be accounted for by considering instantaneous electric field penetration and plasma instability growth time of equatorial irregularities
Studies of Ionospheric Structures and Their Effects on Systems ( file )
1 edition published in 2002 in English and held by 0 libraries worldwide
This is a comprehensive investigation of the basic ionospheric processes which produce plasma density structuring. The emphasis of the research efforts was on understanding the formation and evolution of large-scale structures and the embedded km-scale irregularities that disrupt world-wide Air Force communication and navigation systems. Measurement of the temporal variability of a Sun-aligned arc electrodynamics was conducted with the Sondrestrom radar. It was demonstrated experimentally that traveling convection vortices and large plasma jets are able to form large-scale polar cap patches. The analysis of latitudinal profiles of TEC, obtained between 1800 and 2000 LT, indicated that equatorial spread-F develops when there is a sharp increase of TEC in the crests of the anomaly and a decrease near the trough. We have conducted a correlative study using the neutral winds and the irregularity drifts measured near the magnetic equator to show that most of the time drift and wind are closely coupled. On days when the coupling was not perfect there existed large wind gradients. Using two imagers displaced in longitude by 800 km we were able to perform the first simultaneous observations of the cusp aurora and to determine the response of the whole aurora to changes of the IMF
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