A magnetic levitation based low-gravity simulator with an unprecedented large functional volumeLow gravity environment can have a profound impact on the behaviors of biological systems, the dynamics and heat transfer of fluids, and the growth and self-organization of materials. Systematic…Hamid Sanavandi, Wei Guo·Aug 1, 2021SaveLearn
Machine-learning based discovery of missing physical processes in radiation belt modelingReal-time prediction of the dynamics of energetic electrons in Earth's radiation belts incorporating incomplete observation data is important to protect valuable artificial satellites and to…Enrico Camporeale, George J. Wilkie, Alexander Drozdov et al.·Jul 29, 2021SaveLearn
The updated SANAE neutron monitorNeutron monitors have been the premier ground-based instruments for monitoring the near-Earth cosmic ray flux for more than 70 years. It is essential to continue with such measurements in order to…R. D. Strauss, C. van der Merwe, C. Diedericks et al.·Jul 29, 2021SaveLearn
On a transitional regime of electron resonant interaction with whistler-mode waves in inhomogeneous space plasmaResonances with electromagnetic whistler-mode waves are the primary driver for the formation and dynamics of energetic electron fluxes in various space plasma systems, including shock waves and…A. V. Artemyev, A. I. Neishtadt, A. A. Vasiliev et al.·Jul 28, 2021SaveLearn
Large-scale Structure and Turbulence Transport in the Inner Solar Wind -- Comparison of Parker Solar Probe's First Five Orbits with a Global 3D Reynolds-averaged MHD ModelSimulation results from a global magnetohydrodynamic model of the solar corona and solar wind are compared with Parker Solar Probe (PSP) observations during its first five orbits. The fully…Rohit Chhiber, Arcadi V. Usmanov, William H. Matthaeus et al.·Jul 24, 2021SaveLearn
Seasonal and diurnal dynamics of radio noise for 8-20MHz poleward-oriented mid-latitude radarsBased on ray tracing in a smooth ionosphere described by the IRI-2016 model we have infered the seasonal-diurnal dynamics of radio noise observed by four mid-latitude HF radars. In the calculations,…O. I. Berngardt, J. -P. St. Maurice, J. M. Ruohoniemi et al.·Jul 24, 2021SaveLearn
Making waves: Mirror Mode structures around Mars observed by the MAVEN spacecraftWe present an in-depth analysis of a time interval when quasi-linear mirror mode structures were detected by magnetic field and plasma measurements as observed by the NASA/Mars Atmosphere and…Cyril Simon Wedlund, Martin Volwerk, Christian Mazelle et al.·Jul 23, 2021SaveLearn
Whistler instability driven by the sunward electron deficit in the solar windSolar wind electrons play an important role in the energy balance of the solar wind acceleration by carrying energy into interplanetary space in the form of electron heat flux. The heat flux is…Laura Berčič, Daniel Verscharen, Christopher J. Owen et al.·Jul 22, 2021SaveLearn
Refactoring the MPS/University of Chicago Radiative MHD(MURaM) Model for GPU/CPU Performance Portability Using OpenACC DirectivesThe MURaM (Max Planck University of Chicago Radiative MHD) code is a solar atmosphere radiative MHD model that has been broadly applied to solar phenomena ranging from quiet to active sun, including…Eric Wright, Damien Przybylski, Matthias Rempel et al.·Jul 16, 2021SaveLearn
Stability of superthermal strahl electrons in the solar windWe present a kinetic stability analysis of the solar wind electron distribution function consisting of the Maxwellian core and the magnetic-field aligned strahl, a superthermal electron beam…Jack M. Schroeder, Stanislav Boldyrev, Patrick Astfalk·Jul 16, 2021SaveLearn
Precision Electron Measurements in the Solar Wind at 1 au from NASA's Wind SpacecraftThis work aims to characterize precisely and systematically the non-thermal characteristics of the electron Velocity Distribution Function (eVDF) in the solar wind at 1 au using data from the Wind…Chadi S. Salem, Marc Pulupa, Stuart D. Bale et al.·Jul 16, 2021SaveLearn
Statistics of Large Impulsive Magnetic Events in the Auroral ZoneImpulsive geomagnetic variations, latitudinally localized to the auroral zone, have been observed over the period from 2015-2020. These impulsive events have been observed mostly in the pre-midnight…Kyle Reiter, Sébastien Guillon, Martin Connors et al.·Jul 12, 2021SaveLearn
Effect of Electron Precipitation on E-Region Instabilities: Theoretical AnalysisDuring periods of strong geomagnetic activity, intense currents flow from the magnetosphere into the high-latitude E-region ionosphere along geomagnetic field lines, B. In this region, collisions…Yakov S. Dimant, George V. Khazanov, Meers M. Oppenheim·Jul 9, 2021SaveLearn
Interplanetary Shock-induced Magnetopause Motion: Comparison between Theory and Global Magnetohydrodynamic SimulationsThe magnetopause marks the outer edge of the Earth's magnetosphere and a distinct boundary between solar wind and magnetospheric plasma populations. In this letter, we use global magnetohydrodynamic…Ravindra T. Desai, Mervyn P. Freeman, Jonathan P. Eastwood et al.·Jul 9, 2021SaveLearn
On the High-Energy Spectral Component and Fine Time Structure of Terrestrial Gamma Ray FlashesTerrestrial gamma ray flashes (TGFs) are very short bursts of gamma radiation associated to thunderstorm activity and are the manifestation of the highest-energy natural particle acceleration…M. Marisaldi, M. Galli, C. Labanti et al.·Jul 9, 2021SaveLearn
Energetic Electron Precipitation Occurrence Rates Determined Using the Syowa East SuperDARN RadarWe demonstrate that the Super Dual Auroral Radar Network (SuperDARN) radar at Syowa station, Antarctica, can be used to detect high frequency radio wave attenuation in the D region ionosphere during…Emma C. Bland, Noora Partamies, Erkka Heino et al.·Jul 7, 2021SaveLearn
Gamma Ray Glow Observations at 20-km AltitudeIn the spring of 2017 an ER-2 aircraft campaign was undertaken over continental United States to observe energetic radiation from thunderstorms and lightning. The payload consisted of a suite of…N. Østgaard, H. J. Christian, J. E. Grove et al.·Jul 7, 2021SaveLearn
Yield function of the DOSimetry TELescope count and dose rates aboard the International Space StationThe Earth is constantly hit by energetic particles originating from galactic sources. The flux of these particles is altered by the magnetized solar wind in the heliosphere and the Earth's magnetic…A. S. Caprotti, M. Bruedern, S. Burmeister et al.·Jul 4, 2021SaveLearn
Intake Design for an Atmosphere-Breathing Electric Propulsion System (ABEP)Challenging space missions include those at very low altitudes, where the atmosphere is source of aerodynamic drag on the spacecraft. To extend the lifetime of such missions, an efficient propulsion…F. Romano, J. Espinosa-Orozco, M. Pfeiffer et al.·Jun 30, 2021SaveLearn
Plasma densities, flow and Solar EUV flux at comet 67P - A cross-calibration approachDuring its two-year mission at comet 67P, Rosetta nearly continuously monitored the inner coma plasma environment for gas production rates varying over three orders of magnitude, at distances to the…F. L. Johansson, A. I. Eriksson, E. Vigren et al.·Jun 29, 2021SaveLearn
Timing of the solar wind propagation delay between L1 and Earth based on machine learningErroneous GNSS positioning, failures in spacecraft operations and power outages due to geomagnetically induced currents are severe threats originating from space weather. Having knowledge of…Carsten Baumann, Aoife E. McCloskey·Jun 28, 2021SaveLearn
Magnetic Field Reconstruction for a Realistic Multi-Point, Multi-Scale Spacecraft ObservatoryFuture in situ space plasma investigations will likely involve spatially distributed observatories comprised of multiple spacecraft, beyond the four and five spacecraft configurations currently in…Theodore Broeren, Kristopher Klein, Jason TenBarge et al.·Jun 25, 2021SaveLearn
Local acceleration of protons to 100 keV in a quasi-parallel bow shockRecent observations in the quasi-parallel bow shock by the MMS spacecraft show rapid heating and acceleration of ions up to an energy of about 100 keV. It is demonstrated that a prominent…Krzysztof Stasiewicz, Bengt Eliasson, Ian J. Cohen et al.·Jun 19, 2021SaveLearn
Photodetachment and Test-Particle Simulation Constraints on Negative Ions in Solar System PlasmasNegative ions have been detected in abundance in recent years by spacecraft across the solar system. These detections were, however, made by instruments not designed for this purpose and, as such,…Ravindra T. Desai, Zeqi Zhang, Xinni Wu et al.·Jun 16, 2021SaveLearn
Solar wind discontinuity transformation at the bow shockSolar wind plasma at the Earth's orbit carries transient magnetic field structures including discontinuities. Their interaction with the Earth's bow shock can significantly alter discontinuity…Julia A. Kropotina, Lee Webster, Anton V. Artemyev et al.·Jun 11, 2021SaveLearn