Auroral kilometric radiation and electron pairingWe suggest that pairing of bouncing medium-energy electrons in the auroral upward current region close to the mirror points may play a role in driving the electron cyclotron maser instability to…R. A. Treumann, Wolfgang Baumjohann·Jul 23, 2020SaveLearn
Proton Core Behaviour Inside Magnetic Field SwitchbacksDuring Parker Solar Probe's first two orbits there are widespread observations of rapid magnetic field reversals known as switchbacks. These switchbacks are extensively found in the near-Sun solar…Thomas Woolley, Lorenzo Matteini, Timothy S. Horbury et al.·Jul 21, 2020SaveLearn
Solar Wind Turbulence Around Mars: Relation Between The Energy Cascade Rate And The Proton Cyclotron Waves ActivityThe first estimation of the incompressible energy cascade rate at magnetohydrodynamic (MHD) scales is obtained in the plasma upstream of the Martian bow shock, using MAVEN observations and an exact…Nahuel Andrés, Norberto Romanelli, Lina Z. Hadid et al.·Jul 18, 2020SaveLearn
The Benefits of Very Low Earth Orbit for Earth Observation MissionsVery low Earth orbits (VLEO), typically classified as orbits below approximately 450 km in altitude, have the potential to provide significant benefits to spacecraft over those that operate in higher…N. H. Crisp, P. C. E. Roberts, S. Livadiotti et al.·Jul 15, 2020SaveLearn
Sub-ion scale Compressive Turbulence in the Solar wind: MMS spacecraft potential observationsCompressive plasma turbulence is investigated at sub-ion scales in the solar wind using both the Fast Plasma Investigation (FPI) instrument on the Magnetospheric MultiScale mission (MMS), as well as…Owen Wyn Roberts, Rumi Nakamura, Klaus Torkar et al.·Jul 15, 2020SaveLearn
Electron Dynamics near Diamagnetic Regions of Comet 67P/Churyumov-GerasimenkoThe Rosetta spacecraft detected transient and sporadic diamagnetic regions around comet 67P/Churyumov-Gerasimenko. In this paper we present a statistical analysis of bulk and suprathermal electron…H. Madanian, J. L. Burch, A. I. Eriksson et al.·Jul 11, 2020SaveLearn
Small-scale Magnetic Flux Ropes in the First two Parker Solar Probe EncountersSmall-scale magnetic flux ropes (SFRs) are a type of structures in the solar wind that possess helical magnetic field lines. In a recent report (Chen & Hu 2020), we presented the radial variations of…Yu Chen, Qiang Hu, Lingling Zhao et al.·Jul 9, 2020SaveLearn
A new Look at the Electron Diffusion Region in Asymmetric Magnetic ReconnectionA new look at the structure of the electron diffusion region in collisionless magnetic reconnection is presented. The research is based on a particle-in-cell simulation of asymmetric magnetic…Michael Hesse, Cecilia Norgren, Paul Tenfjord et al.·Jul 7, 2020SaveLearn
Probabilistic Prediction of Geomagnetic Storms and the Kp IndexGeomagnetic activity is often described using summary indices to summarize the likelihood of space weather impacts, as well as when parameterizing space weather models. The geomagnetic index…S. Chakraborty, S. K. Morley·Jul 6, 2020SaveLearn
Inconsistencies Between Local and Global Measures of CME Radial Expansion as Revealed by Spacecraft ConjunctionsThe radial expansion of coronal mass ejections (CMEs) is known to occur from remote observations; from the variation of their properties with radial distance; and from local in situ plasma…N. Lugaz, T. M. Salman, R. M. Winslow et al.·Jul 3, 2020SaveLearn
On O+ ion heating by BBELF waves at low altitude: Test particle simulationsWe investigate mechanisms of wave-particle heating of ionospheric O+ ions resulting from broadband extremely low frequency (BBELF) waves using numerical test particle simulations that take into…Yangyang Shen, David Knudsen·Jul 1, 2020SaveLearn
How Jupiter's Unusual Magnetospheric Topology Structures Its AuroraJupiter's bright persistent polar aurora and Earth's dark polar region indicate that the planets' magnetospheric topologies are very different. High-resolution global simulations show that the…Binzheng Zhang, Peter A. Delamere, Zhonghua Yao et al.·Jun 26, 2020SaveLearn
Using gradient boosting regression to improve ambient solar wind model predictionsStudying the ambient solar wind, a continuous pressure-driven plasma flow emanating from our Sun, is an important component of space weather research. The ambient solar wind flows in interplanetary…R. L. Bailey, M. A. Reiss, C. N. Arge et al.·Jun 23, 2020SaveLearn
Probabilistic Analysis of Power Network Susceptibility to GICsAs reliance on power networks has increased over the last century, the risk of damage from geomagnetically induced currents (GICs) has become a concern to utilities. The current state of the art in…M. J. Heyns, S. I. Lotz, C. T. Gaunt·Jun 22, 2020SaveLearn
Direct Measurement of the Solar-Wind Taylor Microscale using MMS Turbulence Campaign DataUsing the novel Magnetospheric Multiscale (MMS) mission data accumulated during the 2019 MMS Solar Wind Turbulence Campaign, we calculate the Taylor microscale (λT) of the…Riddhi Bandyopadhyay, William H. Matthaeus, Alexandros Chasapis et al.·Jun 20, 2020SaveLearn
Anisotropy of Electric Field Fluctuations Spectrum of Solar Wind TurbulenceTo investigate the power and spectral index anisotropy in the inertial range of solar wind turbulence, we use 70 intervals of electric field data accumulated by Cluster spacecraft in the free solar…Deepali, Supratik Banerjee·Jun 19, 2020SaveLearn
The magnetic structure of the subsolar MPB current layer from MAVEN observations: Implications for the Hall electric forceWe report on the local structure of the Martian subsolar Magnetic Pileup Boundary (MPB) from minimum variance analysis of the magnetic field measured by the Mars Atmosphere and Volatile EvolutioN…G. Boscoboinik, C. Bertucci, D. Gomez et al.·Jun 18, 2020SaveLearn
Interplay of Turbulence and Proton-Microinstability Growth in Space PlasmasNumerous prior studies have shown that as proton beta increases, a narrower range of proton temperature anisotropy values is observed. This effect has often been ascribed to the actions of kinetic…Riddhi Bandyopadhyay, Ramiz A. Qudsi, William H. Matthaeus et al.·Jun 18, 2020SaveLearn
The ELFIN MissionThe Electron Loss and Fields Investigation with a Spatio-Temporal Ambiguity-Resolving option (ELFIN-STAR, or simply: ELFIN) mission comprises two identical 3-Unit (3U) CubeSats on a polar (~93deg…V. Angelopoulos, E. Tsai, L. Bingley et al.·Jun 13, 2020SaveLearn
Properties and geoeffectiveness of solar wind high-speed streams and stream interaction regions during solar cycles 23 and 24We study the properties and geoeffectiveness of solar wind high-speed streams (HSSs) emanating from coronal holes and associated with stream interaction regions (SIRs). This paper presents a…Maxime Grandin, Anita T. Aikio, Alexander Kozlovsky·Jun 11, 2020SaveLearn
Long-term variations of quasi-trapped and trapped electrons in the inner radiation belt observed by DEMETER and SAMPEXElectrons in the Earth's radiation belts can be categorized into three populations: precipitating, quasi-trapped and trapped. We use data from the DEMETER and SAMPEX missions and from ground-based…Kun Zhang, Xinlin Li, Zheng Xiang et al.·Jun 10, 2020SaveLearn
Electromagnetic instabilities of low-beta alpha/proton beams in space plasmasRelative drifts between different species or particle populations are characteristic to solar plasma outflows, e.g., in the fast streams of the solar winds, coronal mass ejections and interplanetary…M. A. Rehman, S. M. Shaaban, P. H. Yoon et al.·Jun 9, 2020SaveLearn
Kinetic Scale Slow Solar Wind Turbulence in the Inner Heliosphere: Co-existence of Kinetic Alfv\'en Waves and Alfv\'en Ion Cyclotron WavesThe nature of the plasma wave modes around the ion kinetic scales in highly Alfv\'enic slow solar wind turbulence is investigated using data from the NASA's Parker Solar Probe taken in the inner…S. Y. Huang, J. Zhang, F. Sahraoui et al.·Jun 8, 2020SaveLearn
Alternative high plasma beta regimes of electron heat-flux instabilities in the solar windThe heat transport in the solar wind is dominated by the suprathermal electron populations, i.e., a tenuous halo and a field-aligned beam/strahl, with high energies and antisunward drifts along the…R. A. López, M. Lazar, S. M. Shaaban et al.·Jun 7, 2020SaveLearn
On the Scaling Properties of Magnetic Field Fluctuations Through the Inner HeliosphereAlthough the interplanetary magnetic field variability has been extensively investigated in situ by means of data coming from several space missions, the newly launched missions providing…Tommaso Alberti, Monica Laurenza, Giuseppe Consolini et al.·Jun 5, 2020SaveLearn