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Articles 31 - 35 of 35
Full-Text Articles in Physics
Schroedinger Representation For The Polarized Gowdy Model, Charles G. Torre
Schroedinger Representation For The Polarized Gowdy Model, Charles G. Torre
All Physics Faculty Publications
The polarized T3 Gowdy model is, in a standard gauge, characterized by a point particle degree of freedom and a scalar field degree of freedom obeying a linear field equation on R × S1. The Fock representation of the scalar field has been well studied. We construct the Schrödinger representation for the scalar field at a fixed value of the Gowdy time in terms of square-integrable functions on a space of distributional fields with a Gaussian probability measure. We show that 'typical' field configurations are slightly more singular than square-integrable functions on the circle. For each time the corresponding Schrödinger …
Hands-On Gravitational Wave Astronomy: Extracting Astrophysical Information From Simulated Signals, Louis J. Rubbo, Shane L. Larson, Michelle B. Larson, Dale R. Ingram
Hands-On Gravitational Wave Astronomy: Extracting Astrophysical Information From Simulated Signals, Louis J. Rubbo, Shane L. Larson, Michelle B. Larson, Dale R. Ingram
All Physics Faculty Publications
In this article we introduce an activity in which introductory astronomy students act as gravitational wave astronomers by extracting information from simulated gravitational wave signals. The process mimics the way real gravitational wave analysis is handled by using plots of a pure gravitational wave signal. The students measure the properties of the simulated signal and use these measurements to evaluate standard relations for astrophysical source parameters. Although the activity described focuses on circular binaries, the techniques described can be applied to other gravitational wave sources as well. A problem based on the discussion in this paper is available for use …
Deep Dielectric Charging Of Spacecraft Polymers By Energetic Protons, Nelson W. Green, John R. Dennison
Deep Dielectric Charging Of Spacecraft Polymers By Energetic Protons, Nelson W. Green, John R. Dennison
All Physics Faculty Publications
The majority of research in the field of spacecraft charging concentrates on electron charging effects with little discussion of charging by protons. For spacecraft orbiting in the traditional LEO and GEO environments, this emphasis on electrons is appropriate since energetic electrons are the dominant species. But for spacecraft in orbits within the inner radiation belts or for interplanetary and lunar space probes, proton charging effects may also be of concern. To examine bulk spacecraft charging effects in these environments several typical highly insulating spacecraft polymers were exposed to energetic protons with energies from 1 MeV to 10 MeV to simulate …
Recent Progress In Mesospheric Gravity Wave Studies Usingnightglow Imaging Systems, Michael J. Taylor, W. R. Pendleton, Pierre-Dominique Pautet, Y. Zhao, C. Olsen, H. K. Surendra-Babu, A. F. Medeiros, H. Takahashi
Recent Progress In Mesospheric Gravity Wave Studies Usingnightglow Imaging Systems, Michael J. Taylor, W. R. Pendleton, Pierre-Dominique Pautet, Y. Zhao, C. Olsen, H. K. Surendra-Babu, A. F. Medeiros, H. Takahashi
All Physics Faculty Publications
During the past four decades a variety of optical remote sensing techniques have revealed a rich spectrum of wave activity in the upper atmosphere. Many of these perturbations, with periodicites ranging from ~5 min to several hours and horizontal scales of a few ten's of km to several thousands km, are due to freely propagating acoustic-gravity waves and forced tidal oscillations. Optical observations of the spatial and temporal characteristics of these waves in the mesosphere and lower thermosphere (MLT) region (~80-100 km) are facilitated by several naturally occurring, vertically distinct nightglow layers. This paper describes the use of state-of-the-art ground-based …
Longitudinal Dependence Of Middle And Low Latitude Zonal Plasmadrifts Measured By De-2, J. W. Jensen, B. G. Fejer
Longitudinal Dependence Of Middle And Low Latitude Zonal Plasmadrifts Measured By De-2, J. W. Jensen, B. G. Fejer
All Physics Faculty Publications
We used ion drift observations from the DE-2 satellite to study for the first time the longitudinal variations of middle and low latitude F region zonal plasma drifts during quiet and disturbed conditions. The quiet-time middle latitude drifts are predominantly westward; the low latitude drifts are westward during the day and eastward at night. The daytime quiet-time drifts do not change much with longitude; the nighttime drifts have strong season dependent longitudinal variations. In the dusk-premidnight period, the equinoctial middle latitude westward drifts are smallest in the European sector and the low latitude eastward drifts are largest in the American-Pacific …