A5064782295- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Laser Design and Applications
- Magnetic confinement fusion research
- Plasma Applications and Diagnostics
- Laser-induced spectroscopy and plasma
- Vacuum and Plasma Arcs
- Particle Dynamics in Fluid Flows
- Atmospheric aerosols and clouds
- Combustion and flame dynamics
- Satellite Communication Systems
- Metal and Thin Film Mechanics
- Laser-Plasma Interactions and Diagnostics
- Ion-surface interactions and analysis
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Combustion and Detonation Processes
- Dust and Plasma Wave Phenomena
- Spectroscopy and Laser Applications
- Underwater Acoustics Research
- Space Technology and Applications
- Electron and X-Ray Spectroscopy Techniques
- Ship Hydrodynamics and Maneuverability
- Bluetooth and Wireless Communication Technologies
NOAA Oceanic and Atmospheric Research
2024
National Oceanic and Atmospheric Administration
2024
NOAA National Marine Fisheries Service
2024
United States Air Force Research Laboratory
2016-2023
Wright-Patterson Air Force Base
2016-2023
Space Telescope Science Institute
2023
UES (United States)
2012-2015
Wright State University
2014
Abstract This paper characterizes the actual science performance of James Webb Space Telescope (JWST), as determined from six month commissioning period. We summarize spacecraft, telescope, instruments, and ground system, with an emphasis on differences pre-launch expectations. Commissioning has made clear that JWST is fully capable achieving discoveries for which it was built. Moreover, almost across board, better than expected; in most cases, will go deeper faster expected. The telescope...
Models of the underwater acoustic soundscape are important for evaluating effects human generated sounds on marine life. The performance models can be validated against measurements or verified each other consistency. A verification workshop was held to compare that predict from wind and vessels estimate detection ranges a submerged target. Eight modeling groups participated in which predicted sound levels with observation windows 1 min km2. Substantial differences were found how modelers...
This paper characterizes the actual science performance of James Webb Space Telescope (JWST), as determined from six month commissioning period. We summarize spacecraft, telescope, instruments, and ground system, with an emphasis on differences pre-launch expectations. Commissioning has made clear that JWST is fully capable achieving discoveries for which it was built. Moreover, almost across board, better than expected; in most cases, will go deeper faster expected. The telescope instrument...
Using a two-frame intensified charge coupled device (iCCD) imaging system with 2 ns exposure time, we observed the dynamics of voltage breakdown and corona generation in experiments fast ns-time exploding fine Ni stainless-steel (SS) wires vacuum. These show that along wire surface is subjected to temporal-spatial inhomogeneity. For both metal wires, an initial bright cathode spot before ionization entire length. This does not expand time. 25.4 μm diameter SS explosions positive polarity,...
Experiments with electrically exploding fine Al and Ag wires in air demonstrate a strong dependence of the expanding metal core condition velocity on ambient pressure. Expansion wire varies by 23 times between ∼0.2 km/s ∼4.6 km/s. The shock-wave at atmospheric pressure is ∼5 increases to ∼6 when decreased 50 Torr. strongly dependent material whether it into vacuum or against for different surrounding pressures general agree Paschen's Law gap.
Spatially resolved temperature measurements within a microdischarge in atmospheric pressure air have been conducted using Rayleigh scattering of pulsed ultraviolet laser. scatter images were used to generate highly 1D and 2D profiles translational temperature, with the analysis based on ideal gas inverse relationship between density. The technique was shown be practical an upper limit approximately 2000 K. results compared standard optical emission spectral analyses bands, where calculated...
The concept of a parametric antenna in ionospheric plasma is analyzed. Such antennas are capable exciting electromagnetic radiation fields, specifically the creation whistler waves generated at very low frequency (VLF) range, which also propagating large distances away from source region. mechanism wave generation considered interaction quasi-electrostatic (also known as oblique resonance (LOR) oscillations) excited by conventional loop antenna. LOR with quasi-neutral density perturbations...
Abstract An argon actinometry approach which uses the 777 nm and 844 atomic oxygen lines along with common N 2 / <?CDATA ${\mathrm{N}}_{2}^{+}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mi mathvariant="normal">N</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> line ratio method is used to experimentally investigate excitation mechanisms of O(3p 5 P) state in medium pressure...
We have studied the parametric interaction between a fast magnetosonic (FM) mode and lower oblique resonance (LOR) in cold, magnetized plasma using kinetic, three dimensional Particle-in-Cell simulation code called Large Scale Plasma. The FM is excited with loop antenna driven at frequency below hybrid (ωLH), while LOR above ωLH. For historical purposes explained Introduction, we call antennas which drive Extremely Low Frequency (ELF) Very (VLF) antennas, respectively. are modeled as...
Vibratory pile driving is a common means of installation in both near-shore and offshore environments. Spectral knowledge the noise produced by this activity crucial modeling assessing impacts to aquatic species. With goal providing generic representative spectra better inform propagation related impacts, approximately 80 near-pile measurements vibratory cylindrical steel piles from more than 19 hydroacoustic reports were analyzed. Included diameters range 24–48 inches all activities U.S....
A novel, automated, 2-D line-shift measurement algorithm is presented for optical interferometry in plasma diagnostics. By using the smoothing and leveling (SL) as a preprocessing stage to Fourier transform method (FTM), proposed SL-FTM extracts line shift without priori knowledge of spectral properties image, common requirement other FTM-based algorithms. The simple implement, demonstrated side-on views from exploded wires, where interference patterns suffer low contrast, signal-to-noise...
Summary form only given. The problem of producing collisional and collisionless shocks in the laboratory is great interest for numerous space plasma applications1. One approach based on idea combining strong magnetic field created during a Z-pinch discharge with flow produced process two wire implosion experiment <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . In support we propose to use pulse power generator following parameters:...