Alfv\'enic Thermospheric Upwelling in a Global Geospace ModelMotivated by low-altitude cusp observations of small-scale (~ 1 km) field-aligned currents (SSFACs) interpreted as ionospheric Alfv\'en resonator modes, we investigated the effects of Alfv\'en wave…Benjamin Hogan, William Lotko, Kevin Pham·Oct 22, 2020SaveLearn
Statistical analysis of orientation, shape, and size of solar wind switchbacksOne of the main discoveries from the first two orbits of Parker Solar Probe (PSP) was the presence of magnetic switchbacks, whose deflections dominated the magnetic field measurements. Determining…Ronan Laker, Timothy S. Horbury, Stuart D. Bale et al.·Oct 20, 2020SaveLearn
Local and global properties of energy transfer in models of plasma turbulenceThe nature of the turbulent energy transfer rate is studied using direct numerical simulations of weakly collisional space plasmas. This is done comparing results obtained from hybrid Vlasov-Maxwell…Christian L. Vásconez, Denise Perrone, Raffaele Marino et al.·Oct 16, 2020SaveLearn
Magnetic Cloud and Sheath in the Ground-Level Enhancement Event of 2000 July 14. II. Effects on the Forbush DecreaseForbush decreases (Fds) in galactic cosmic ray intensity are related to interplanetary coronal mass ejections (ICMEs). The parallel diffusion of particles is reduced because the magnetic turbulence…G. Qin, S. -S. Wu·Oct 15, 2020SaveLearn
Stochastic and quasi-adiabatic electron heating in quasi-parallel shocksUsing Magnetospheric Multiscale (MMS) observations at the Earth's quasi-parallel bow shock we demonstrate that electrons are heated by two different mechanisms: a quasi-adiabatic heating process…Krzysztof Stasiewicz, Bengt Eliasson·Oct 8, 2020SaveLearn
Observation of Inertial-range Energy Cascade within a Reconnection Jet in Earth's MagnetotailEarth's magnetotail region provides a unique environment to study plasma turbulence. We investigate the turbulence developed in an exhaust produced by magnetic reconnection at the terrestrial…Riddhi Bandyopadhyay, Alexandros Chasapis, D. J. Gershman et al.·Oct 5, 2020SaveLearn
Electron Temperature Anisotropy and Electron Beam Constraints From Electron Kinetic Instabilities in the Solar WindElectron temperature anisotropies and electron beams are nonthermal features of the observed nonequilibrium electron velocity distributions in the solar wind. In collision-poor plasmas these…Heyu Sun, Jinsong Zhao, Wen Liu et al.·Oct 2, 2020SaveLearn
On the Generation of Compressible Mirror-mode Fluctuations in the Inner HeliosheathMeasurements made with the Voyager 1 spacecraft indicate that significant levels of compressive fluctuations exist in the inner heliosheath. Some studies have already been performed with respect to…Horst Fichtner, Jens Kleimann, Peter H. Yoon et al.·Oct 2, 2020SaveLearn
The Electron Proton Helium INstrument as an Example for a Space Weather Radiation InstrumentThe near-Earth energetic particle environment has been monitored since the 1970's. With the increasing importance of quantifying the radiation risk for, e.g. for the human exploration of the Moon and…Patrick Kühl, Bernd Heber, Raúl Gómez-Herrero et al.·Oct 2, 2020SaveLearn
A Review of Gas-Surface Interaction Models for Orbital Aerodynamics ApplicationsRenewed interest in Very Low Earth Orbits (VLEO) - i.e. altitudes below 450 km - has led to an increased demand for accurate environment characterisation and aerodynamic force prediction. While the…Sabrina Livadiotti, Nicholas H. Crisp, Peter C. E. Roberts et al.·Oct 1, 2020SaveLearn
The Extreme Space Weather Event in February/March 1941Given the infrequency of extreme geomagnetic storms, it is significant to note the concentration of three extreme geomagnetic storms in 1941, whose intensities ranked fourth, twelfth, and fifth…Hisashi Hayakawa, Sean P. Blake, Ankush Bhaskar et al.·Oct 1, 2020SaveLearn
Turbulence characteristics of switchbacks and non-switchbacks intervals observed by Parker Solar ProbeWe use Parker Solar Probe (PSP) in-situ measurements to analyze the characteristics of solar wind turbulence during the first solar encounter covering radial distances between…Sofiane Bourouaine, Jean C. Perez, Kristopher C. Klein et al.·Sep 29, 2020SaveLearn
Exploration of trans-Neptunian objects using the Direct Fusion DriveThe Direct Fusion Drive (DFD) is a nuclear fusion engine that will provide thrust and electrical power for any spacecraft. It is a compact engine, based on the D -3He aneutronic fusion reaction…Paolo Aime, Marco Gajeri, Roman Ya. Kezerashvili·Sep 26, 2020SaveLearn
A Titan mission using the Direct Fusion DriveThe main purpose of this work is to perform an analysis of realistic new trajectories for a robotic mission to Saturn's largest moon, Titan, in order to demonstrate the great advantages related to…Marco Gajeri, Paolo Aime, Roman Ya. Kezerashvili·Sep 26, 2020SaveLearn
Separation and Quantification of Ionospheric Convection Sources: 1. A New TechniqueThis paper describes a novel technique that allows separation and quantification of different sources of convection in the high-latitude ionosphere. To represent the ionospheric convection electric…J. P. Reistad, K. M. Laundal, N. Østgaard et al.·Sep 24, 2020SaveLearn
On the Radial and Longitudinal Variation of a Magnetic Cloud: ACE, Wind, ARTEMIS and Juno ObservationsWe present observations of the same magnetic cloud made near Earth by the Advance Composition Explorer (ACE), Wind, and the Acceleration, Reconnection, Turbulence and Electrodynamics of the Moon's…E. E. Davies, R. J. Forsyth, S. W. Good et al.·Sep 21, 2020SaveLearn
Major Scientific Challenges and Opportunities in Understanding Magnetic Reconnection and Related Explosive Phenomena in Solar and Heliospheric PlasmasMagnetic reconnection underlies many explosive phenomena in the heliosphere and in laboratory plasmas. The new research capabilities in theory/simulations, observations, and laboratory experiments…H. Ji, J. Karpen, A. Alt et al.·Sep 17, 2020SaveLearn
Heliospheric Energetic Neutral Atoms: Non-stationary Modeling and Comparison with IBEX-Hi dataThe Interstellar Boundary Explorer (IBEX) has been measuring fluxes of the Energetic Neutral Atoms (ENAs) using the IBEX-Hi (0.3 -- 6 keV) instrument since 2008. We have developed a numerical…I. I. Baliukin, V. V. Izmodenov, D. B. Alexashov·Sep 16, 2020SaveLearn
Separation and Quantification of Ionospheric Convection Sources: 2. The Dipole Tilt Angle Influence on Reverse Convection Cells During Northward IMFThis paper investigates the influence of Earth's dipole tilt angle on the reverse convection cells (sometimes referred to as lobe cells) in the Northern Hemisphere ionosphere during northward IMF,…J. P. Reistad, K. M. Laundal, N. Østeward et al.·Sep 15, 2020SaveLearn
Shear-Driven Transition to Isotropically Turbulent Solar Wind Outside the Alfven Critical ZoneMotivated by prior remote observations of a transition from striated solar coronal structures to more isotropic ``flocculated'' fluctuations, we propose that the dynamics of the inner solar wind just…D. Ruffolo, W. H. Matthaeus, R. Chhiber et al.·Sep 14, 2020SaveLearn
Dependence of great geomagnetic storm intensity (-H-200 nT) on associated solar wind parametersWe use -H to capture the variation in the SYM-H index during the main phase of a geomagnetic storm. We define great geomagnetic storms as those with -H -200 nT. After…Ming-Xian Zhao, Gui-Ming Le, Qi Li et al.·Sep 13, 2020SaveLearn
Quasi-adiabatic and stochastic heating and particle acceleration at quasi-perpendicular shocksBased on Magnetospheric Multiscale (MMS) observations from the Earth's bow shock, we have identified two plasma heating processes that operate at quasi-perpendicular shocks. Ions are subject to…Krzysztof Stasiewicz, Bengt Eliasson·Sep 11, 2020SaveLearn
Narrowband oblique whistler-mode waves: Comparing properties observed by Parker Solar Probe at <0.2 AU and STEREO at 1 AUAIM: Large amplitude narrowband obliquely propagating whistler-mode waves at frequencies of ~0.2 fce (electron cyclotron frequency) are commonly observed at 1 AU, and are most consistent with the…C. Cattell, B. Short, A. Breneman et al.·Sep 11, 2020SaveLearn
Domain of Influence analysis: implications for Data Assimilation in space weather forecastingSolar activity, ranging from the background solar wind to energetic coronal mass ejections (CMEs), is the main driver of the conditions in the interplanetary space and in the terrestrial space…Dimitrios Millas, Maria Elena Innocenti, Brecht Laperre et al.·Sep 9, 2020SaveLearn
Magnetic helicity signature and its role in regulating magnetic energy spectra and proton temperatures in the solar windIn a previous paper, we found that proton temperatures are clearly associated with the proton-scale turbulence in the solar wind, and magnetic helicity signature appears to be an important indicator…G. Q. Zhao, Y. Lin, X. Y. Wang et al.·Sep 9, 2020SaveLearn