A5007006139- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Radiation Detection and Scintillator Technologies
- Geomagnetism and Paleomagnetism Studies
- Methane Hydrates and Related Phenomena
- Laser-induced spectroscopy and plasma
- Particle Detector Development and Performance
- Radiation Therapy and Dosimetry
- Plasma Diagnostics and Applications
- Membrane Separation Technologies
- Advanced Optical Sensing Technologies
- Photocathodes and Microchannel Plates
- Earthquake Detection and Analysis
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Atmospheric and Environmental Gas Dynamics
- Mass Spectrometry Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Medical Imaging Techniques and Applications
- Dark Matter and Cosmic Phenomena
- Spacecraft and Cryogenic Technologies
- Atomic and Molecular Physics
- High-pressure geophysics and materials
- Membrane Separation and Gas Transport
Southwest Research Institute
2016-2025
The University of Texas at San Antonio
2022-2024
Kennedy Space Center
2023
Ames Research Center
2023
University of Wisconsin–Madison
2023
University of California, Los Angeles
2023
Boston University
2023
The University of Texas at Arlington
2023
National Institute of Advanced Industrial Science and Technology
2002-2017
Tohoku University
2011
The Solar Orbiter mission seeks to make connections between the physical processes occurring at Sun or in solar corona and nature of wind created by those which is subsequently observed spacecraft. also targets itself during its journey from source To meet specific science goals, will be equipped with both remote-sensing in-situ instruments unprecedented measurements atmosphere inner heliosphere. A crucial set provided Wind Analyser (SWA) suite instruments. This consists an Electron System...
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...
Aims. Solar Orbiter launched in February 2020 with the goal of revealing connections between Sun’s interior, atmosphere, and heliosphere. The Heavy Ion Sensor (HIS) is a time-of-flight ion mass spectrometer dedicated to measuring heavy ions solar wind. Methods. We present an overview first measurements composition from HIS, reviewing methods used transform spectra obtained on board into scientific data products examining two wind case studies as well statistical properties observed by HIS....
We report on the time evolution of energetic neutral atom (ENA) emissions measured by Interstellar Boundary Explorer (IBEX) during instances compressed and expanded dayside magnetosheath. The ENA observations, taken passage a corotating interaction region 27 28 November 2010, are compared with in situ observations from Time History Events Macroscale Interactions Substorms (THEMIS) spacecraft. IBEX's field view (6.5° full width at half maximum) covered wide magnetosheath for several days,...
Abstract Shock parameters at Earth’s bow shock in rare instances can approach the Mach numbers predicted supernova remnants. We present our analysis of a high Alfvén number ( M A = 27) utilizing multipoint measurements from Magnetospheric Multiscale spacecraft during crossing quasi-perpendicular shock. find that dynamics are mostly driven by reflected ions, perturbations they generate, and nonlinear amplification perturbations. Our analyses show ions create modest magnetic enhancements...
Abstract A new ion composition and three-dimensional velocity analyzer, 3-Dimensional mass Imager (3DI), measures 3D distribution functions (VDFs) for each major species in Earth’s topside ionosphere. The 3DI instrument is composed of a miniaturized electrostatic analyzer (ESA) deflector, backed by static, magnet-based, spectrometer. We have developed micro-pixel read-out anode technique that significantly saves power the particle detection system, integrated it into an imaging microchannel...
This paper summarizes the Seven Sisters solar wind mission concept and outstanding science questions motivating objectives. The includes seven individual spacecraft designed to uncover fundamental physical processes in provides up ≈ 2 days of advanced space weather warnings for 550 Earth during mission. will collect critical measurements thermal suprathermal plasma magnetic fields, utilizing, first time, Venus–Sun Lagrange points. multi-spacecraft configuration makes it possible distinguish...
Abstract We report on the properties of suprathermal electrons observed over three discrete auroral arcs from a sounding rocket. By applying shifted kappa distributions and analyzing parameters (density, temperature, kappa), we found novel characteristics to provide clues understand acceleration mechanisms magnetosphere‐ionosphere coupling processes. First, potential drop was proportional inverse square kappa, consistent with previous theoretical investigations by Dors Kletzing ( ). The...
Abstract The velocity distribution functions (VDFs) of He + pickup ions (PUIs) through two interplanetary coronal mass ejection (ICME) events associated with shocks are examined. Their specific properties in pitch-angle space were used as tracers the local physical processes. These VDFs studied using observations from PLasma And SupraThermal Ion Composition instrument on board Solar Terrestrial Relations Observatory 10 minutes cadence and full energy angular resolutions. analysis focuses...
Proper characterization of particle energization in the solar wind requires observations from thermal through energetic particles multiple elements. Observations situ different energy ranges require instruments that must be properly intercalibrated. Solar Orbiter’s Heavy Ion Sensor (HIS) is a time-of-flight ion mass spectrometer observes heavy composition wind. Suprathermal Spectrograph (SIS) an detector suprathermal energies to lower range particles. We report on intercalibration...
<title>Abstract</title> We investigate the spatiotemporal evolution of Subauroral Ion Drifts (SAIDs) and a midlatitude trough during geomagnetic storm over timescales. Using data from multiple Defense Meteorological Satellite Program (DMSP) satellites, we analyze SAID event its connection to trough. During main phase an intense (Dst $<$-100 nT), exhibited equatorward movement approximately 2.5$^{\circ}$ in magnetic latitude (MLAT), while width high-speed channel associated with broadened...
Abstract Using energetic neutral atom (ENA) emission observations of the subsolar magnetopause measured by Interstellar Boundary Explorer (IBEX), we study correlation between upstream interplanetary magnetic field (IMF) conditions and spectral index source ion population. Our ENA data set includes hour‐averaged measurements at energies ∼0.5 ∼6 keV obtained IBEX High Energy imager from January 2009 to May 2011. Under condition quiet geomagnetic activity ( SYM ‐ H >−20 nT), find that...
Mass transfer from CO2 drops traveling in high-pressure and low-temperature water, simulating the process of ocean disposal, was investigated a water tunnel. This investigation covered cases for with without hydrate shell. In both cases, dissolved indicating that crystal shell did not stop mass transfer. Influence flow on studied. The drop-shrinkage rate noticed to increase velocity; and, found be much smaller than under same condition. Coefficients were analyzed. former case, mass-transfer...
Abstract We present remote, continuous observations from the Interstellar Boundary Explorer of terrestrial plasma sheet location back to −16 Earth radii ( R E ) in magnetospheric tail using energetic neutral atom emissions. The time period studied includes two orbits near winter and summer solstices, thus associated with large negative positive dipole tilt, respectively. Continuous side‐view images reveal a complex shape that is dominated mainly by large‐scale warping due diurnal motion...
Abstract The Interstellar Boundary Explorer (IBEX) frequently images the Earth's magnetosphere in Energetic Neutral Atoms (ENAs). In May 2013, there was an extended period of northward interplanetary magnetic field (IMF) while IBEX imaging magnetotail. During this period, imaged development cold plasma sheet between about 15 and 20 Earth radii ( R E ) down tail from Earth. ENA fluxes changed both amplitude average energy during development. addition, may have thickened. At end interval, IMF...
Abstract The Miniaturized Electron pRoton Telescope, MERiT, is a low‐mass, low‐power, compact instrument using an innovative combination of particle detectors, sensor electronics, and onboard processing. MERiT flying on the Compact Radiation belt Explorer, CeREs, 3U CubeSat launched into low earth orbit 500‐km altitude inclination 85° 16 December 2018. primary secondary science goals CeREs are to investigate electron microbursts study solar particles. comprises stack solid state detectors...
Gamma-rays, the most energetic photons, carry information from far reaches of extragalactic space with minimal interaction or loss information. They bring messages about particle acceleration in environments so extreme they cannot be reproduced on earth for a closer look. Gamma-ray astrophysics is complementary collider work that physicists and astroparticle are often one same. instruments, especially Fermi Space Telescope, have been pivotal major multi-messenger discoveries over past...
Abstract This paper reports on properties of energetic electrons observed by the Auroral Particle Detector (APD) board sounding rocket S-310-35, which was launched from And/0ya Rocket Range, Norway, at 0033:00 UT 13 December 2004 during DELTA campaign. The APD designed to measure energy spectra in range 3.5 65 keV every 10 ms using avalanche photodiodes. measurement done altitudes 90–140 km (apogee height flight), corresponded collisional interaction region precipitating with atmospheric...
The CubeSat Mission for studying Solar Particles is a NASA Science Directorate and Heliophysics Division funded 6U Interplanetary Mission. CuSP scheduled to launch in mid-2020 as secondary payload on the SLS EM -1 (Exploratory One) flight. pathfinder mission Space Weather Research it will be first heliophysics science placed heliocentric orbit outside influence of Earth's magnetosphere. features three complementary, miniaturized sensors address two objectives: study sources acceleration...
Abstract The performance of silicon avalanche photodiodes (APDs) and single crystal chemical vapor deposit diamond detectors (DDs) is reviewed in comparison with conventional silicon‐based solid‐state (SSDs) from the perspective space plasma applications. Although low‐energy threshold energy resolution are equivalent to SSDs, DDs offer a high radiation tolerance very low leakage currents due wider band gap than silicon. In addition, can operate at higher temperatures, insensitive light...