A5078064076- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Spacecraft Design and Technology
- Geophysics and Gravity Measurements
- Laser-induced spectroscopy and plasma
- Planetary Science and Exploration
- Atomic and Subatomic Physics Research
- GNSS positioning and interference
- Plasma Diagnostics and Applications
- Atmospheric Ozone and Climate
- Mass Spectrometry Techniques and Applications
- Space Satellite Systems and Control
- Spacecraft and Cryogenic Technologies
- Satellite Communication Systems
- Atomic and Molecular Physics
- Magnetic Field Sensors Techniques
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Computational Physics and Python Applications
- Atmospheric and Environmental Gas Dynamics
- Ion-surface interactions and analysis
- Radiation Effects in Electronics
Los Alamos National Laboratory
2016-2025
New Mexico Consortium
2015-2023
Tempus Labs (United States)
2022-2023
Wayne State University
2023
Northern Michigan University
2023
Los Alamos National Security (United States)
2020
University of New Hampshire
2020
Johns Hopkins University Applied Physics Laboratory
2020
The Aerospace Corporation
2020
Montana State University
2003-2020
The Van Allen radiation belts contain ultrarelativistic electrons trapped in Earth's magnetic field. Since their discovery 1958, a fundamental unanswered question has been how can be accelerated to such high energies. Two classes of processes have proposed: transport and acceleration from source population located outside the (radial acceleration) or lower-energy relativistic energies situ heart (local acceleration). We report measurements NASA's Radiation Belt Storm Probes that clearly...
The Radiation Belt Storm Probes (RBSP)-Energetic Particle, Composition, and Thermal Plasma (ECT) suite contains an innovative complement of particle instruments to ensure the highest quality measurements ever made in inner magnetosphere radiation belts. coordinated RBSP-ECT measurements, analyzed combination with fields waves observations state-of-the-art theory modeling, are necessary for understanding acceleration, global distribution, variability belt electrons ions, key science...
The HOPE mass spectrometer of the Radiation Belt Storm Probes (RBSP) mission (renamed Van Allen Probes) is designed to measure in situ plasma ion and electron fluxes over 4π sr at each RBSP spacecraft within terrestrial radiation belts. scientific goal understand underlying physical processes that govern belt structure dynamics. Spectral measurements for both ions electrons are acquired 1 eV 50 keV 36 log-spaced steps an energy resolution ΔE FWHM/E≈15 %. dominant species (H+, He+, O+)...
We present observations of the radiation belts from Helium Oxygen Proton Electron and Magnetic Ion Spectrometer particle detectors on Van Allen Probes satellites that illustrate energy dependence L shell belt enhancements decays. survey events in 2013 analyze an event 1 March more detail. The show following: (a) at all shells, lower electrons are enhanced often than higher energies; (b) fill slot region common (c) inner zone (d) even when do not fully region, energies tend to extend shells...
The Interstellar Mapping and Acceleration Probe (IMAP) is a revolutionary mission that simultaneously investigates two of the most important overarching issues in Heliophysics today: acceleration energetic particles interaction solar wind with local interstellar medium. While seemingly disparate, these are intimately coupled because accelerated inner heliosphere play critical roles outer heliospheric interaction. Selected by NASA 2018, IMAP planned to launch 2024. spacecraft simple...
Abstract Networks made of single‐walled carbon nanotubes (SWNTs) and metallic nanowire networks, graphene, ultra‐thin metal films have all been proposed as replacements for transparent conducting oxides (TCOs) in photovoltaic other applications. However, only limited comparisons nanostructured networks TCOs are available. Several common figures merit that often used to compare the electrical optical performance contacts evaluated here, merits each method comparison discussed. Calculating...
Magnetospheric banded chorus is enhanced whistler waves with frequencies
As a sharp feature in the sky, ribbon of enhanced energetic neutral atom (ENA) flux observed by Interstellar Boundary Explorer (IBEX) mission is key signature for understanding interaction heliosphere and interstellar medium through which we are moving. Over five nominal IBEX energy passbands (0.7, 1.1, 1.7, 2.7, 4.3 keV), extraordinarily circular, with peak location centered at ecliptic (λRC, βRC) = (2192 ± 13, 399 23) half cone angle ϕC 745 20. A slight elongation ribbon, generally...
Abstract We use an E × B ‐driven plasmapause test particle (PTP) simulation to provide global contextual information for in situ measurements by the Van Allen Probes (Radiation Belt Storm (RBSP)) during 15–20 January 2013. During 120 h of time beginning on 15 January, geomagnetic activity produced three plumes. The third and largest simulated plume formed enhanced convection 17 survived as a rotating, wrapped, residual tens hours. To validate simulation, we compare its output with RBSP data....
Abstract We describe an automated computer algorithm designed to remove background contamination from the Van Allen Probes Magnetic Electron Ion Spectrometer (MagEIS) electron flux measurements. provide a detailed description of with illustrative examples on‐orbit data. find two primary sources in MagEIS data: inner zone protons and bremsstrahlung X‐rays generated by energetic electrons interacting spacecraft material. Bremsstrahlung primarily produce lower energy channels (∼30–500 keV)...
Abstract Enabled by the comprehensive measurements from Magnetic Electron Ion Spectrometer (MagEIS), Helium Oxygen Proton mass spectrometer (HOPE), and Radiation Belt Storm Probes Composition Experiment (RBSPICE) instruments onboard Van Allen in heart of radiation belt, relative contributions ions with different energies species to ring current energy density their dependence on phases geomagnetic storms are quantified. The results show that lower (<50 keV) protons enhance much more often...
Abstract Recent observations by the Van Allen Probes spacecraft have demonstrated that a variety of electric field structures and nonlinear waves frequently occur in inner terrestrial magnetosphere, including phase space holes, kinetic line resonances, whistler mode waves, several types double layer. However, it is unclear whether such significant impact on dynamics radiation belts ring current. To make progress toward quantifying their importance, this study statistically evaluates...
Abstract Van Allen Probes observations are presented which demonstrate the presence of nonlinear electric field structures in inner terrestrial magnetosphere (<6 R E ). A range observed, including phase space holes and double layers. These observed over several Earth radii radial distance a wide magnetic local times. They dusk, midnight, dawn sectors, with highest concentration premidnight. Some to coincide dipolarizations increases electron energy flux for energies between 1 keV 30 keV....
Abstract We present initial dual spacecraft observations that for the first time both constrain spatial scale size and provide spectral properties at medium energies of electron microbursts. explore individual microburst events occurred on 2 February 2015 using simultaneous made by twin CubeSats which comprise National Science Foundation (NSF) Focused Investigations Relativistic Electron Bursts: Intensity, Range, Dynamics (FIREBIRD II). During these events, two identically instrumented...
Abstract A stretched and compressed geomagnetic field occurred during the main phase of a storm on 1 June 2013. During Van Allen Probes spacecraft made measurements plasma sheet boundary layer observed large fluxes O + ions streaming up line from nightside auroral region. Prior to there was an increase in hot (>1 keV) more isotropic sheet. In inbound pass through ring current region phase, H were significantly enhanced. We show that this enhanced inner magnetosphere population is due...
We describe a new data product combining the spin-averaged electron flux measurements from Radiation Belt Storm Probes (RBSP) Energetic Particle Composition and Thermal Plasma (ECT) suite on National Aeronautics Space Administration's Van Allen Probes. methodology used to combine each of sets produce consistent set spectra for September 2013 present. Three-minute-averaged are provided spanning energies 15 eV up 20 MeV. This provides additional utility ECT offers cross calibrated researchers...
Abstract Based on comprehensive measurements from Helium, Oxygen, Proton, and Electron Mass Spectrometer Ion Spectrometer, Relativistic Electron‐Proton Telescope, Radiation Belt Storm Probes Composition Experiment instruments the Van Allen Probes, comparative studies of ring current electrons ions are performed role energetic in dynamics is investigated. The deep injections tens to hundreds keV protons into inner magnetosphere occur frequently; after decay slowly belt but low L region very...
To determine the feasibility of T2-weighted magnetic resonance (MR) imaging in noninvasive quantification renal inflammation by using superparamagnetic iron oxide (SPIO) nanoparticles targeted to tissue-bound C3 activation fragments a mouse model lupus nephritis.All animal procedures were approved University Colorado-Denver care and use committee. SPIO encapsulated amine-functionalized phospholipids. A recombinant protein containing C3d-binding region complement receptor type 2 (CR2) was...
Abstract not Available.
Abstract We report the wave observations, associated plasma measurements, and linear theory testing of electromagnetic ion cyclotron (EMIC) events observed by Van Allen Probes on 28 April 2013. The are detected in their generation regions as three individual two consecutive orbits Probe‐A, while other spacecraft, B, does not detect any significant EMIC activity during this period. Three overlapping H + populations around plasmapause when waves excited. difference between observational growth...
Abstract Using the Helium Oxygen Proton Electron (HOPE) and Electric Field Waves (EFW) instruments from Van Allen Probes, we explored relationship between electron energy fluxes in eV keV ranges spacecraft surface charging. We present statistical results on charging within geosynchronous orbit by L MLT. An algorithm to extract H + line HOPE instrument data was developed better explore intense events. Also, this study how potential relates number density, pressure, temperature, thermal...
Abstract We study the formation process of an oxygen torus during 12–15 November 2012 magnetic storm, using field and plasma wave data obtained by Van Allen Probes. estimate local mass density ( ρ L ) electron number n e from resonant frequencies standing Alfvén waves upper hybrid resonance band. The average ion M can be calculated ∼ / under assumption quasi‐neutrality plasma. During storm recovery phase, both Probe A B observe at = 3.0–4.0 3.7–4.5, respectively, on morning side. has 4.5–8...
Abstract This paper presents observations of ultralow‐frequency (ULF) waves from Van Allen Probes. The event that generated the ULF occurred 2 days after a minor geomagnetic storm during geomagnetically quiet time. Narrowband pulsations with frequency about 7 mHz moderate amplitudes were registered in premidnight sector when Probe A was passing through an enhanced density region near geosynchronous orbit. B, which passed earlier, did not detect narrowband but only broadband noise. Despite...
FIREBIRD-II is a National Science Foundation funded CubeSat mission designed to study the scale size and energy spectrum of relativistic electron microbursts. The consists two identical 1.5 U CubeSats in low earth polar orbit, each with solid state detectors that differ only their geometric factors fields view. Having spacecraft close orbit allows microbursts be investigated through intra-spacecraft separation when are observed simultaneously on unit. Each detector returns high cadence (10 s...