A5057341480- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Planetary Science and Exploration
- Earthquake Detection and Analysis
- Space Exploration and Technology
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Atomic and Subatomic Physics Research
- Geophysics and Gravity Measurements
- Space Satellite Systems and Control
- Isotope Analysis in Ecology
- Meteorological Phenomena and Simulations
- Magnetic confinement fusion research
- Astrophysics and Star Formation Studies
- Solar Radiation and Photovoltaics
- GNSS positioning and interference
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Laser-induced spectroscopy and plasma
- Astrophysics and Cosmic Phenomena
- Non-Destructive Testing Techniques
- Tropical and Extratropical Cyclones Research
- Dark Matter and Cosmic Phenomena
Southwest Research Institute
2016-2025
University of Cologne
2024
The University of Texas at San Antonio
2010-2022
Laboratory for Atmospheric and Space Physics
2007
Auburn University
2000-2002
The Sun moves through the local interstellar medium, continuously emitting ionized, supersonic solar wind plasma and carving out a cavity in space called heliosphere. recently launched Interstellar Boundary Explorer (IBEX) spacecraft has completed its first all-sky maps of interaction at edge heliosphere by imaging energetic neutral atoms (ENAs) emanating from this region. We found bright ribbon ENA emission, unpredicted prior models or theories, that may be ordered magnetic field...
The Jovian Auroral Distributions Experiment (JADE) on Juno provides the critical in situ measurements of electrons and ions needed to understand plasma energy particles processes that fill magnetosphere ultimately produce its strong aurora. JADE is an instrument suite includes three essentially identical electron sensors (JADE-Es), a single ion sensor (JADE-I), highly capable Electronics Box (EBox) resides Radiation Vault all necessary control, low high voltages, computing support for four...
Abstract Juno's highly eccentric polar orbit takes it to perijove distances of 1.06 on each orbit. For the first perijove, this occurred just north jovigraphic equator, but has precessed by about a degree per over mission. Minimum altitudes vary from 3,200–8,000 km through The Waves instrument observes number plasma wave modes in and near non‐auroral ionosphere that provide information local electron density, including oscillations occur at frequency whistler‐mode hiss which an upper limit...
Abstract Simulation studies of the Earth's radiation belts and ring current are very useful in understanding acceleration, transport, loss energetic particles. Recently, Comprehensive Ring Current Model (CRCM) Radiation Belt Environment (RBE) model were merged to form a Inner Magnetosphere‐Ionosphere (CIMI) model. CIMI solves for many essential quantities inner magnetosphere, including ion electron distributions belts, plasmaspheric density, Region 2 currents, convection potential,...
The Juno spacecraft acquired direct observations of the jovian magnetosphere and auroral emissions from a vantage point above poles. Juno's capture orbit spanned bow shock to planet, providing magnetic field, charged particle, wave phenomena context for passage over poles traverse Jupiter's hazardous inner radiation belts. energetic particle plasma detectors measured electrons precipitating in polar regions, exciting intense aurorae, observed simultaneously by ultraviolet infrared imaging...
Abstract Juno obtained unique low‐altitude space environment measurements over Jupiter's poles on 27 August 2016. Here Jupiter Energetic‐particle Detector Instrument observations are presented for electrons (25–800 keV) and protons (10–1500 keV). We analyze magnetic field‐aligned electron angular beams expected auroral regions that were sometimes symmetric (bidirectional) but more often strongly asymmetric. Included variable surprisingly persistent upward, monodirectional emerging from what...
We present the first comparison of Jupiter's auroral morphology with an extended, continuous, and complete set near‐Jupiter interplanetary data, revealing response auroras to conditions. show that for ∼1–3 days following compression region onset, planet's main emission brightened. A duskside poleward also brightened during compressions, as well shallow rarefaction conditions at start program. The power emitted from noon active did not exhibit dependence on any parameter, though typically...
New Horizons unveils the Pluto system In July 2015, spacecraft flew through at high speed, humanity's first close look this enigmatic on outskirts of our solar system. a series papers, team present their analysis encounter data downloaded so far: Moore et al. complex surface features and geology its large moon Charon, including evidence tectonics, glacial flow, possible cryovolcanoes. Grundy analyzed colors chemical compositions surfaces, with ices H 2 O, CH 4 , CO, N NH 3 reddish material...
Abstract We report on the first observations of 100 eV to keV electrons over auroral regions Jupiter by Jovian Auroral Distributions Experiment (JADE) board Juno mission. The focus is that were magnetically connected main oval. Amongst most remarkable features, JADE observed electron beams, mostly upward going but also some downward in south, at latitudes from ~69° 72° and ~ −66° −70° corresponding M shells (“M” for magnetic) ~18 54 ~28 61, respectively. beams replaced loss cones lower...
Abstract A large set of observations Jupiter's ultraviolet aurora was collected with the Hubble Space Telescope concurrently NASA‐Juno mission, during an eight‐month period, from 30 November 2016 to 18 July 2017. These cover Juno orbits 3 7 which in situ and remote sensing instruments, as well other observatories, obtained a wealth unprecedented information on magnetosphere connection its auroral ionosphere. is known vary rapidly, timescales ranging seconds one Jovian rotation. The main...
Abstract The Juno spacecraft crossed flux tubes connected to the Io footprint tail at low Jovian altitudes on multiple occasions. transits covered longitudinal separations of approximately 10° 120° along tail. Juno's suite magnetospheric instruments acquired detailed measurements observed planetward electron energy fluxes ~70 mW/m 2 near and ~10 farther down tail, with correlated, intense electric magnetic wave signatures, which also decreased All distributions were broad in energy,...
Abstract Two new Juno‐observed particle features of Jupiter's main aurora demonstrate substantial diversity processes generating mysterious auroral emissions. It was previously speculated that sometimes‐observed potential‐driven (up to 400 kV) can turn into broadband stochastic acceleration (dominating at Jupiter) by means instability. Here direct evidence for such a process is revealed with “mono‐energetic” electron inverted‐V rising in energy 200 keV, transforming region downward fluxes...
Abstract On 27 August 2016, the NASA Juno spacecraft performed its first close‐up observations of Jupiter during perijove. Here we present UV images and color ratio maps from Juno‐UVS imaging spectrograph acquired at that time. Data were four sequences (three in north, one south) 5:00 UT to 13:00 UT. From these observations, produced complete Jovian aurorae, including nightside. The sequence shows development intense outer emission outside main oval, a localized region (255°–295° System III...
Abstract The relationship between electron energy flux and the characteristic of distributions in main auroral loss cone bridges gap predictions made by theory measurements just recently available from Juno. For decades such relationships have been inferred remote sensing observations Jovian aurora, primarily Hubble Space Telescope, also more Hisaki. However, to infer these quantities, techniques had assume properties atmospheric structure—leading uncertainties their profile. Juno's arrival...
Abstract This study presents a survey of ion flow speed, density, temperature, and composition observed by the Jovian Auroral Distributions Experiment Ion (JADE‐I) sensor on Juno from 10–40 R J in dawn to midnight sector Jupiter's magnetosphere. The covers orbits 5–22, observations are separated equatorial (|z mag [R ]| ≤ 1.5) off‐equator ]|>1.5) regions. Plasma parameters for H + , O 2+ 3+ Na S derived forward modeling JADE‐I's energy‐per‐charge versus time‐of‐flight spectra using...
Water-group gas continuously escapes from Jupiter's icy moons to form co-orbiting populations of particles or neutral toroidal clouds. These clouds provide insights into their source as they reveal loss processes and compositions parent bodies, alter local plasma composition, act sources sinks for magnetospheric particles. We report the first observations H
Abstract The Jovian Auroral Distributions Experiment Ion sensor (JADE‐I) on NASA’s Juno mission provides in‐situ measurements of ions from 0.1 to 46.2 keV/q inside Jupiter’s magnetosphere. JADE‐I is used study the plasma with two types datasets same measurement: Time‐of‐flight (TOF) and SPECIES. TOF dataset mass‐per‐charge a range 1–64 amu/q but oversamples particles over 6 π steradian viewing per spacecraft spin has little directional information. On other hand, SPECIES can provide good...
Abstract The Juno mission flew through the plasma disk near equator in Jupiter's magnetosphere frequently. We identify 274 crossings of between 10 and 40 R J from PJ5 to PJ44. Using a forward modeling method that combines JADE‐I time‐of‐flight SPECIES data sets, we perform survey ion properties disk. Ions are heated 1.5 6 keV 15 30 . Density temperature locally anti‐correlated. Assumed be related centrifugal instabilities, cold, dense commonly observed midnight. Plasma corotates around...
Jupiter's magnetotail is the largest cohesive structure in solar system and marks loss of vast numbers heavy ions from Jupiter system. The New Horizons spacecraft traversed to distances exceeding 2500 jovian radii (R(J)) revealed a remarkable diversity plasma populations structures throughout its length. Ions evolve hot disk distribution at approximately 100 R(J) slower, persistent flows down tail that become increasingly variable flux mean energy. highly structured-exhibiting sharp breaks,...
This study is the first to combine energetic neutral atom (ENA) observations from Two Wide‐Angle Imaging Neutral‐Atom Spectrometers (TWINS) and Interstellar Boundary Explorer (IBEX). Here we examine arrival of an interplanetary shock subsequent geomagnetically effective substorm on 5 April 2010, which was associated with Galaxy 15 communications satellite anomaly. IBEX shows sharply enhanced ENA emissions immediately upon compression dayside magnetosphere at 08:26:17+/−9 s UT. The drove a...