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GPS Radiation Instrument Modeling and Simulation (Project w14_gpsradiation) [Slides]
Simulated background in all sensors as well as signal in the particle channels which are intended to measure electron. The electron channels are called E1-E11 – each of which is intended to detect a different range of electron energies.
GPS Radiation Measurements: Instrument Modeling and Simulation (Project w14_gpsradiation)
The following topics are covered: electron response simulations and typical calculated response. Monte Carlo calculations of the response of future charged particle instruments (dosimeters) intended to measure the flux of charged particles in space were performed. The electron channels are called E1- E11 – each of which is intended to detect a different range of electron energies. These instruments are on current and future GPS satellites.
Simulations of Double Layer Formation: Institutional Computing 2016
Simulations for the 2D particle-in-cell (PIC) cases cited are presented.
Timing Comparisons for GLEs and High-energy Proton Events using GPS Proton Measurements
This report describes the goal of this project which is to understand how high-energy protons enter the geomagnetic field and arrive at GPS satellites.
SHIELDS Institutional Computing Report
The main objective of the LDRD-DR SHIELDS project is to develop a new capability to understand, model, and predict the spacecraft Surface Charging Environment (SCE)
Cross-Calibration of the GPS Constellation CXD Proton Data with GOES EPS [Slides]
The CXD provides good quality proton flux measurements across a range of proton energies. The data within the 1 st and 3 rd quartile range of the ratio of integral flux values is within 20 – 40%. While proton response of the CXD extends down to 6 MeV due to collimator holes in instrument filters, the > 10 MeV integral proton flux is not well captured as shown by the comparisons with EPS. We recommend that users of the data restrict their analysis to proton energies > 20 MeV. Although the full dataset is available now [https://www.ngdc.noaa.gov/stp/spaceweather/satellite-data/satellite-systems/gps/] this updated flux calculation is not present and so a reprocessing will commence soon and the dataset updated. These calibrated datasets will allow a number of exciting multipoint analyses such as more accurate probing of geomagnetic cutoffs as well as providing additional input to radiation belt climatology models such as AE9/AP9/SPM [Ginet et al., 2013].
Electron Environment at Geostationary Orbit: AE9 Summary Results
This report captures the outputs from the AE9 for the electron environment at geostationary orbit. There is no new work, simply a collection of model outputs to make them easier to use and tailored to quick data gathering for geostationary orbit studies. Other models do exist, such as POLE, but a comprehensive look at each is beyond the scope of this work. Other resources are contained in the references.
Extreme Values in the Radiation Belts: How Big and How Bad? [Slides]
Overall Point: Once a radiation belt event has begun, how intense will it be and how long will it last?
Key Aspects of Self-Consistent Ring Current Modeling
Recent advancements in the self-consistent modeling of the plasma and fields in the inner magnetosphere; Challenges facing model development and use for space weather prediction.
Toward Discovering the Structure and Dynamics of the Sun-Interstellar Medium System (Los Alamos LDRD Report)
We have taken major steps toward developing the tools necessary to explore with unprecedented resolution the plasma structure and dynamics of the Sun-interstellar medium (ISM) interaction region, known as the heliosheath. We have applied a rigorous imaging technique known as Generalized Ridge Regression (GRR) to construct statistically robust sky maps of hydrogen energetic neutral atoms (ENAs) emanating from this region and detected by the Los Alamos-led IBEX-Hi ENA imager [1] on NASA’s Interstellar Boundary Explorer (IBEX) mission [2]. Our methods go far beyond the map reconstruction process currently applied by the IBEX Science Operations Center (ISOC), opening up the possibility of new discovery science with the IBEX data set and positioning LANL for a lead science role for the upcoming Interstellar Mapping and Acceleration Probe (IMAP) mission [3] for which LANL is providing two key experiments. We have successfully demonstrated that the new maps are higher resolution and are capable of revealing structures that are not presently resolveable in standard ISOC maps
IC project High-energy Particle Acceleration by Extreme Coronal Shocks [Slides]
Abstract not provided.
Heating and Acceleration of Solar Wind by Parametric Decay Instability Mediated Turbulence
One of the main goals of this project to understand the origin of density fluctuations in the solar winds, as revealed by the NASA’s Flagship satellite Parker Solar Probe (PSP) measurements, which motivates us to simulate and analyze magnetohydrodynamic (MHD) turbulence in the compressible regime. To achieve this goal, we have developed a set of sophisticated turbulence driving methods to study how MHD turbulence will develop under different time-correlated fluctuations at large-scales. Another key advance is that we have developed a new 3+1 (three spatial plus time domain) 4D FFT analysis of simulation data-cubes so that we can perform the spatio-temporal spectrum and mode decomposition studies on MHD turbulence.
IC Project w20_solarwind: Heating and Acceleration of Solar Wind by Parametric Decay Instability Mediated Turbulence
Abstract not provided.
Temperature of Suprathermal Electron Strahl at ACE as an Indicator of Solar Coronal Origin Temperature [Slides]
Determine the effectiveness of using electron strahl temperature to infer coronal source temperature. Suprathermal electron strahl temperature derived from measurements at 1 AU does retain information regarding the coronal source temperature from which it originates. This correlation is most strongly measured during the leading edges of coronal hole events but is generally also present in full event measurements. This correlation is also observed in CME events during a coronal hole.
Particle Acceleration at Parallel Shocks: a fully kinetic simulation [Slides]
Solar energetic particles are high-energy charged particles accelerated by solar flares and coronal mass ejections (CMEs).