A5103007276- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Magnetic confinement fusion research
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Magnetic Field Sensors Techniques
- Ion-surface interactions and analysis
- X-ray Spectroscopy and Fluorescence Analysis
- Planetary Science and Exploration
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Dust and Plasma Wave Phenomena
- Infrared Target Detection Methodologies
- Scientific Measurement and Uncertainty Evaluation
- Oceanographic and Atmospheric Processes
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Advanced Frequency and Time Standards
- Aerospace Engineering and Energy Systems
- Radiation Therapy and Dosimetry
- Advanced Measurement and Detection Methods
Goddard Space Flight Center
2016
Marshall Space Flight Center
1988-2011
Southwest Research Institute
1997-2009
University of New Hampshire
1996
Cornell University
1996
The Fast Plasma Investigation (FPI) was developed for flight on the Magnetospheric Multiscale (MMS) mission to measure differential directional flux of magnetospheric electrons and ions with unprecedented time resolution resolve kinetic-scale plasma dynamics. This increased has been accomplished by placing four dual 180-degree top hat spectrometers around periphery each MMS spacecraft. Using electrostatic field-of-view deflection, eight species together provide 4pi-sr with, at worst,...
Up to now, observations had been unable show conclusively a one‐to‐one correspondence between perpendicular ion acceleration and particular type of plasma wave within the O + source region below 2000 km. In this paper we demonstrate that intense (100–300 mV/m) lower hybrid waves are responsible for transversely accelerating H ions characteristic energies up 6 eV. This wave‐particle interaction takes place in thin filamentary density cavities oriented along geomagnetic field lines. The...
Abstract The Rosetta spacecraft has escorted comet 67P/Churyumov‐Gerasimenko since 6 August 2014 and offered an unprecedented opportunity to study plasma physics in the coma. We have used this make first characterization of cometary electrons with kappa distributions. Two three‐dimensional functions were fit observations, which we interpret as two populations dense warm (density = 10 cm −3 , temperature 2 × 5 K, invariant index 10−>1000), rarefied hot 0.005 1–10) electrons. observations...
High time resolution ion mass spectrometer distribution function measurements and wave data from a sounding rocket flight over an aurora have revealed the fine structure of transverse acceleration mechanism in upper ionosphere. The transversely accelerated (TAI) events can occur volume with cross‐field dimension as small several tens meters thus appear 50–100 ms bursts due to payload motion. Bulk heating characteristic energy eV tail direction perpendicular B few percent ambient ions order...
Initial ENA images obtained with the MENA imager on IMAGE observatory show that ENAs emanating from Earth’s magnetosphere at least crudely track both Dst and Kp . Images during storm of August 12, 2000, clearly strong ring current asymmetry main phase early recovery phase, a high degree symmetry late phase. Thus, these establish existence partial complete currents same storm. Further, they suggest loss through day side magnetopause dominates other processes
We report direct observations of the three‐dimensional velocity distribution selected topside ionospheric ion species in an auroral context between 500 and 550 km altitude. find heating transverse to local magnetic field core plasma, with significant O + , He H as well tail events that occur independently heating. The departs from bi‐Maxwellian, at one point exhibiting apparent ring‐like shape. However, these are shown be aliased within arc by temporal variations not well‐resolved plasma...
The POLAR satellite often observes upflowing ionospheric ions (UFIs) in and near the auroral oval on southern perigee (∼5000 km altitude) passes. We present UFI features observed by thermal ion dynamics experiment (TIDE) toroidal imaging mass angle spectrograph (TIMAS) dusk‐dawn sector under two different geomagnetic activity conditions order to elicit their relationships with forms, wave emissions, convection pattern from additional instruments. During active interval, ultraviolet imager...
Data obtained during an active rocket‐borne ion beam injection experiment (ARCS 3), which was carried out in the polar cap ionosphere over Sondre Stromfjord, Greenland, are presented and discussed. The consisted of a main instrumented sounding rocket payload separated subpayload from two Ar + generators were operated. These produced neutralized beams aligned generally perpendicular antiparallel to ambient geomagnetic field lines, as spinning payloads moved apart along (0–1 km) across (0–0.5...
Abstract Taking advantage of technological developments in wafer‐scale processing over the past two decades, such as deep etching, 3‐D chip stacking, and double‐sided lithography, we have designed fabricated key elements an ultracompact (1.5 cm) 3 plasma spectrometer that requires only low‐voltage power supplies, has no microchannel plates, a high aperture area to instrument volume ratio. The initial design targets measurement charged particles 3–20 keV range with highly directional field...