A5045393802- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Solar Radiation and Photovoltaics
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Laser-induced spectroscopy and plasma
- Atomic and Subatomic Physics Research
- Gamma-ray bursts and supernovae
- Mass Spectrometry Techniques and Applications
- Nuclear Physics and Applications
- GNSS positioning and interference
- Atomic and Molecular Physics
- Space Satellite Systems and Control
- Plasma Diagnostics and Applications
- Astrophysics and Cosmic Phenomena
- Spacecraft Design and Technology
- Photovoltaic System Optimization Techniques
- Magnetic confinement fusion research
- Market Dynamics and Volatility
- Global Energy and Sustainability Research
- Radiation Therapy and Dosimetry
Los Alamos National Laboratory
2015-2024
New Mexico Consortium
2017-2023
Los Alamos National Security (United States)
2000-2020
Laboratoire de Physique des Plasmas
2018
University of Washington
1996-2011
Southwest Research Institute
2009
University of Montana
2009
Los Alamos Medical Center
2006
Jet Propulsion Laboratory
2002
University of Michigan
2002
The Solar Wind Electrons Alphas and Protons (SWEAP) Investigation on Probe Plus is a four sensor instrument suite that provides complete measurements of the electrons ionized helium hydrogen constitute bulk solar wind coronal plasma. SWEAP consists Cup (SPC) Analyzers (SPAN). SPC Faraday looks directly at Sun measures ion electron fluxes flow angles as function energy. SPAN an electrostatic analyzer (ESA) ram side SPP (SPAN-A) ESA anti-ram (SPAN-B). SPAN-A has time flight section enables it...
We demonstrate extreme ionospheric response to the large interplanetary electric fields during “Halloween” storms that occurred on October 29 and 30, 2003. Within a few (2–5) hours of time when enhanced field impinged magnetopause, dayside total electron content increases ∼40% ∼250% are observed for 30 events, respectively. During Oct event, ∼900% in above CHAMP satellite (∼400 km altitude) were at mid‐latitudes (±30 degrees geomagnetic). The geomagnetic storm‐time phenomenon prompt...
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+)...
This study examines solar wind plasma and magnetic field observations from Ulysses' first full polar orbit in order to characterize the high‐latitude under conditions of decreasing low activity. By comparing taken over nearly all heliolatitudes two different intervals covering same radial distances, we are able separate latitudinal variations wind. We find that once gradients removed, none parameters show much variation, indicating emanating coronal holes is extremely uniform. In addition,...
Observations of solar wind from both large polar coronal holes (PCHs) during Ulysses' third orbit showed that the fast was slightly slower, significantly less dense, cooler, and had mass momentum flux than previous minimum (first) orbit. In addition, while much more variable, measurements in in‐ecliptic match quantitatively with Ulysses show essentially identical trends. Thus, these combined observations indicate significant, long‐term variations output entire Sun. The trend to lower dynamic...
We have obtained direct evidence for local magnetic reconnection in the solar wind using plasma and field data by Advanced Composition Explorer (ACE). The prime consists of accelerated ion flow observed within reversal regions wind. Here we report such observations interior an interplanetary coronal mass ejection (ICME) or at interface between two ICMEs on 23 November 1997 a time when was stronger than usual. acceleration consistent with Walen relationship, which relates changes velocity to...
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...
Ulysses is now completing its second solar polar orbit, dropping back down in latitude as the Sun passes through post‐maximum phase of cycle. A mid‐sized circumpolar coronal hole that formed around maximum northern hemisphere has persisted and produced a highly inclined CIR, which was observed from ∼70°N to ∼30°N. We find speed maxima high‐speed streams follow same slow drop with decreasing large holes minimum. These results suggest wind acceleration effect related heliolatitude or rotation....
After ten long years of wandering the uncharted seas, Ulysses returned to his home port Ithaca. Similarly, after its unprecedented five year odyssey through previously regions over poles Sun, spacecraft has slow, variable solar wind which dominates observations near ecliptic plane. Solar plasma and magnetic field from are used examine this return fast polar region variability into a slow low latitude streamer belt. As it journeyed equatorward, encountered large corotating interaction...
The interaction of the solar wind and Earth's magnetosphere is complex phenomenology very different for dominated by interplanetary coronal mass ejections (ICMEs) compared to corotating regions (CIRs). We perform a superposed epoch study effects ICME‐ CIR‐dominated upon storm‐time plasma at geosynchronous orbit using data from magnetospheric analyzer (MPA) instruments on board seven Los Alamos National Laboratory (LANL) satellites. Using 78 ICME events 32 CIR events, we examine electron ion...
On 29–30 October 2003 the Solar Wind Electron Proton Alpha Monitor (SWEPAM) instrument on Advanced Composition Explorer (ACE) spacecraft measured solar wind speeds in excess of 1850 km/s, some highest ever directly wind. These were observed following two large coronal mass ejection (CME) driven shocks. Surprisingly, despite unusually high speeds, many other parameters not particularly unusual comparison with transient events. The magnetic field reached −68 nT, a but unprecedented value....
A coordinated effort to combine all three methods that are used determine the physical parameters of interstellar gas in heliosphere has been undertaken. In order arrive at a consistent parameter set agrees with observations neutral gas, pickup ions and UV backscattering we have combined data sets from observation campaigns over years 1998 through 2000. The key include ACE Ulysses SWICS, atoms GAS, as well He focusing cone close Sun SOHO UVCS 1 AU EUVE. For first time also solar EUV...
We have surveyed the 0.1-10 MeV nucleon-1 elemental abundances at 72 interplanetary (IP) shocks observed by Ultra-Low-Energy Isotope Spectrometer on board Advanced Composition Explorer from 1997 October through 2002 September. find following: (1) The C/O ratios in IP were substantially depleted (by more than ~40%) relative to solar wind values. (2) shock poorly correlated with those measured slow and fast wind. (3) Energetic ions above ~0.1 impulsive gradual energetic particle events (SEPs)...
The last solar minimum, which extended into 2009, was especially deep and prolonged. Since then, sunspot activity has gone through a very small peak while the heliospheric current sheet achieved large tilt angles similar to prior maxima. wind fluid properties interplanetary magnetic field (IMF) have declined prolonged minimum continued be low mini maximum. Compared values typically observed from mid-1970s mid-1990s, following proton parameters are lower on average 2009 day 79 of 2013: speed...
Magnetospheric banded chorus is enhanced whistler waves with frequencies
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....
HelioSwarm (HS) is a NASA Medium-Class Explorer mission of the Heliophysics Division designed to explore dynamic three-dimensional mechanisms controlling physics plasma turbulence, ubiquitous process occurring in heliosphere and plasmas throughout universe. This will be accomplished by making simultaneous measurements at nine spacecraft with separations spanning magnetohydrodynamic sub-ion spatial scales variety near-Earth plasmas. In this paper, we describe scientific background for HS...
We discuss fast ejecta observed at 1 AU during a period of increasing solar activity from February 5, 1998, to November 29, 1999. “Fast ejecta” are transient, noncorotating flows that move past the Earth day or more, with maximum speed >600 km s −1 . identify two classes AU: (1) magnetic clouds, whose local structure is flux rope; and (2) “complex ejecta,” which not ropes have disordered fields. Nearly equal numbers clouds complex were found: four five, respectively. The had weaker fields...