An Optics Field Site for Auroral Studies

The earlier orbits and ephemerides for the Soviet satellites were not sufficiently accurate to be very useful in making observations in Alaska. Extrapolations from our own observations gave better predictions. This merely pointed out the fact that rough observations of meridian transits at high latitudes will give better values of the inclination of the orbit than precision observations at low latitudes. Hence, it was decided to observe visually the meridian transits estimating the altitude by noting the position with respect to the stars or using crude alidade measurements. The times of the earlier observations were observed on a watch or clock and the clock correction obtained from WWV. Later the times were determined with the aid of stop watches, taking time intervals from WWV signals. This rather meager program of optical observations of the Soviet satellites was undertaken to give supplementary data for use of the radio observations, and particularly to assist in the prediction of position of the satellite so that the 61-foot radar of Stanford Research Institute could be set accurately enough to observe it (the beam width at the half-power points is about 3°). This report contains primarily the visual observations made at the Geophysical Institute by various members of the staff, and a series of observations by Olaf Halverson at Nome, Alaska. In addition there is a short discussion of the geometry of the trajectory, the illumination of a circumpolar satellite, and a note on the evaluation of Brouwer's moment factors.IGY Project No. 1.14 NSF Grant No. Y/1.14/1771. Introduction -- 2. General Construction -- [3. Operation of Instruments] 3.1 Sky view and location -- 3.2 Supports for instruments -- 3.3 Facilities for each major instrument : a) Hunten scanning spectrometer ; b) IGY patrol spectrograph ; c) College meridian mirror spectrograph ; d) Huet prism spectrograph ; e) Roach scanning photometer ; f) All-sky camera ; g) Future installations -- 4. Auxiliary Facilities : 4.1 Electric power; circuit details ; 4.2 Other services -- 5. SummaryYe

A latitudinal survey of hydroxyl airglow emissions Final report, 1 Apr. 1969 - 31 Mar. 1970

Airborne photometer instrumentation and measurement data on high latitude hydroxyl airglow emissio

Catalogue of Huet auroral spectra 1957-1959

The zenith auroral spectra at College, Alaska, obtained during the 1957-1959 observing seasons, has been assembled in catalogue form. The prime purpose of this catalogue is to present the auroral activity in a manner which can be used by others in the interpretation of aurorally associated phenomena. Prom the general appearance of the spectra and other factors, a table of daily index numbers (1 -9) is given for two observing periods. Although these numbers should not be used in themselves as correlation data they are valuable as representative indices. This point is indicated by the clear appearance of the spring maximum in activity and a general yearly decline in activity towards the minimum of the sunspot cycle.Ye

The Lived Experiences of High School Students Who Self-Identify as Readers: A Phenomenological Study

The purpose of this phenomenological study was to explore and better understand the lived experiences of what it means to be a reader as a high school student. The literature revealed a plethora of studies and articles on various aspects of reading and many pieces from teachers, researchers, and academics’ perspectives, but there are virtually no studies that have explored what being a reader means from the high school reader’s perspective; no studies that have explored the lived experiences of what being a reader means to high school students. The central question guiding this study asked, “What is the lived experience of a self-identified reader?” I discussed and explored the lived experiences with 11 high school juniors and seniors in three high schools in a small city in the northeastern United States. The theory that guided this study was Vygotsky’s social constructivism theory; this theory is predicated on the belief that development and learning are socially situated. The three main elements of this theory, social interaction, the more knowledgeable other, and the zone of proximal development, all are related to students’ learning to read and developing as readers and are therefore related to the study’s focus. This study collected data in four ways: personal interviews, text and email messages, protocol writing, and reader-inspired photographs, pictures, and images. Data were analyzed using lean coding, thematic analysis, and phenomenological reflection

Coordinated observations of chemical releases from the ground and from aircraft at high latitudes

The ground observations of the Na-Li trail released from a Nike-Apache rocket obtained by the Geophysical Institute are discussed. By using the nominal trajectory for a 60 pound payload and the particular rocket, a best fit trajectory was determined based on the Ester Dome photographic data, launch time and earth-sun geometrical shadow height. From these calculations, the height of obvious features along the trail were determined and their velocity estimated. A clockwise rotation of the velocity vector with increasing height was observed. Velocities deduced at various altitudes were then compared to meter radar data also obtained during this period. The comparisons of these two neutral wind measurements techniques are satisfactory

Analysis of data acquired on the 1968 airborne auroral expedition Final report, 1 Aug. 1968 - 30 Jun. 1970

Spectral variability analysis on airborne aurora and airglow emission dat

Photometric measurements of surface characteristics of echo i satellite final report

Photometric measurements of Echo I satellite surface characteristic

Ground-based photometric surveillance of the passive geodetic satellite

Ground-based photometry of Passive Geodetic Earth Orbiting Satellite /PAGEOS

Sit-to-Stand Symmetry in Individuals with Hip Pathology

Post-hip fracture patients continue to exhibit asymmetries during sit-to-stand task following rehabilitation. While strength is thoroughly addressed, perceptual deficits may be a missing component to rehabilitation post-hip fracture

Biomechanics of reactions to impending falls

Responses of 11 young adult males, initially standing, to support surface forward accelerations of 0.18 g were investigated. In response to the impending falls this stimulus initiated, body segment motions and myoelectric activities in six muscles were measured. These measurements were then input to 9 or 12 segment whole body biomechanical models and the reaction joint torques needed to produce the motions were calculated.Mean relative joint rotations were as large as 92.8[deg] and calculated relative joint angular accelerations as large as 29.7 rad s-2. Mean myoelectric signal latencies in the six muscles monitored ranged from 135 ms at the ankles to 176 ms at the shoulders with intermediate values at intermediate joints. Mean values of calculated maximum joint torques ranged to 70 Nm at the ankles, 82 Nm at the knees, 73 Nm at the hips, and 19 Nm at the shoulders.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/27580/1/0000624.pd