The twin Van Allen Probe spacecraft, launched in August 2012, carry identical scientific payloads. Electric and Magnetic Field Instrument Suite Integrated Science suite includes a plasma wave instrument (Waves) that measures three magnetic electric components of waves the frequency range 10 Hz to 12 kHz using triaxial search coils Fields Waves field sensors. also single component 500 kHz. A primary objective higher-frequency measurements is determination electron density

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 present a statistical survey of the latitudinal structure fast magnetosonic wave mode detected by Van Allen Probes spanning time interval 21 September 2012 to 1 August 2014. show that statistically, occurrence frequency ( f ) normalized local proton cyclotron cP has distinct funnel‐shaped appearance in latitude about magnetic equator similar found case studies. By comparing observed E/B ratios with model ratio, using plasma density and background field magnitude as input we this...

This review focusses strictly on existing plasma density models, including ionospheric source empirical physics-based and machine-learning models. is framed in the context of radiation belt physics space weather codes. The limited to most commonly used models or recently developed promising. A great variety conditions considered such as magnetic local time variation, geomagnetic conditions, regions, radial latitudinal dependence, collisional vs. collisionless conditions. These can serve...

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 Using the Van Allen Probes, we investigate enhancement in large‐scale duskward convection electric field during geomagnetic storm ( Dst ~ −120 nT) on 1 June 2013 and its role ring current ion transport energization plasmasphere erosion. During this storm, enhancements of ~1–2 mV/m corotating frame are observed down to L shells as low ~2.3. A simple model consisting a dipole magnetic constant, azimuthally westward, is used calculate earthward westward drift 90° pitch angle ions. This...

Abstract Time-dependent SOLPS-ITER simulations have been used to identify reduced models with the sparse identification of nonlinear dynamics (SINDy) method and develop model-predictive control boundary plasma state using main ion gas puff actuation. A series actuation sequences are input into produce a dynamic response in upstream divertor quantities. The SINDy is applied linear for electron density at outboard midplane <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Abstract We present cross‐scale magnetospheric observations of the 17 March 2015 (St. Patrick's Day) storm, by Time History Events and Macroscale Interactions during Substorms (THEMIS), Van Allen Probes (Radiation Belt Storm Probes), Two Wide‐angle Imaging Neutral‐atom Spectrometers (TWINS), plus upstream ACE/Wind solar wind data. THEMIS crossed bow shock or magnetopause 22 times observed compression that initiated storm. Empirical models reproduce these boundary locations within 0.7 R E ....

Abstract We analyze a database of Dynamics Explorer‐1 (DE‐1) Retarding Ion Mass Spectrometer densities and temperatures to yield the first explicit measure how cold ion concentration depends on temperature. find that H + He concentrations have very weak dependence temperature, but O increases steeply as these ions become warmer. demonstrate this result can aid in analyzing composition data from other satellites without spacecraft potential mitigation, by applying an example using Van Allen...

Abstract The output of a plasmapause test particle (PTP) code is used to formulate new epoch‐based model. PTP simulation run for an ensemble 60 storms spanning 3 September 2012 28 2017 and having peak D st −60 nT or less, yielding over 7 million model locations. Events are automatically identified epoch times calculated relative the respective storm peaks. Epoch analysis simulated demonstrated be effective method reveal dynamical phases plume formation evolution. radius found strongly...

Abstract We quantify the spatial relationship between plasmapause and outer belt electrons for a 5 day period, 15–20 January 2013, by comparing locations of relativistic electron flux peaks to plasmapause. A peak‐finding algorithm is applied 1.8–7.7 MeV data. gradient finder wave‐derived number densities &gt;10 cm −3 . identify two belts. Outer 1 stable zone &gt;3 located 1–2 R E inside 2 dynamic &lt;3 within 0.5 moving Electron fluxes earthward each belt's peak are anticorrelated with cold...

Abstract A new method of inferring electron plasma densities inside the plasmasphere is presented. Utilizing observations electric and magnetic field wave power associated with plasmaspheric hiss, coupled cold dispersion relation, permits calculation density. This methodology yields a density estimate for each frequency channel time interval where hiss observed shown to yield results that are generally in agreement determined via other methods. statistical calibration performed against from...

Abstract The plasmasphere is a critical region of the magnetosphere. It important for evolution Earth's radiation belts. Waves in interior (hiss) and vicinity (electromagnetic ion cyclotron, chorus) help control acceleration loss belt particles. Thus, understanding extent, structure, content, dynamics crucial to losses. Van Allen Probes mission uses two methods determine total plasma density. First, upper hybrid resonance frequency can provide electron density; this determination most...

Abstract This paper presents the first analysis of Van Allen Probes measurements cold plasma density and electric field in inner magnetosphere to show that intervals strong modulation at solar rotation period occur locations outer plasmasphere plasmapause (~0.7 R E peak‐to‐peak), large‐scale (~0.24 mV/m (~250 ~70 cm −3 peak‐to‐peak). Solar is more apparent declining phase cycle than near maximum. The periodicities these parameters are compared extreme ultraviolet irradiance, wind dawn‐dusk...

Abstract This paper presents the application of full time-dependent SOLPS-ITER simulations for actuator design in SPARC tokamak. study employs both EIRENE module, a neutral solver, and B2.5 plasma module mode. is contrast to most SOLPS simulations, which focus on steady-state solutions, where distribution evolved without any time limit or step 1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mo>⋅</mml:mo> <mml:msup> <mml:mn>10</mml:mn>...

Abstract We simulate equatorial plasmaspheric electron densities using a physics‐based model (Cold PLasma, CPL; used in the ring current‐atmosphere interactions model) of source and loss processes refilling erosion driven by empirical inputs. The performance CPL is evaluated against situ measurements Van Allen Probes (Radiation Belt Storm Probes) for two events: 31 May to 5 June 15 20 January 2013 geomagnetic storms observed premidnight postmidnight magnetic local time (MLT) sectors,...

We demonstrate the application of data-driven linear operator construction for time advance with a goal accelerating plasma physics simulation. apply dynamic mode decomposition (DMD) to data produced by nonlinear SOLPS-ITER (Scrape-off Layer Plasma Simulator - International Thermonuclear Experimental Reactor) boundary code suite in order estimate series operators and monitor their predictive accuracy via online error analysis. find that this approach defines when these dynamics can be...

Abstract The predicted divertor conditions for the SPARC tokamak are calculated using SOLPS-ITER a range of scrape-off-layer (SOL) heat flux widths λ q , input powers, and particle fueling locations. Under H-mode scenario with an upstream separatrix density 1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> </mml:mrow> <mml:mn>20</mml:mn> </mml:msup> <mml:mstyle scriptlevel="0"/> </mml:math> m −3 most...