Principal component analysis of Birkeland currents determined by the Active Magnetosphere and Planetary Electrodynamics Response ExperimentPrincipal component analysis is performed on Birkeland or field-aligned current (FAC) measurements from the Active Magnetosphere and Planetary Electrodynamics Response Experiment. Principal component…S. E. Milan, J. A. Carter, H. Korth et al.·Jun 3, 2016SaveLearn
How the IMF By induces a By component in the closed magnetosphere and how it leads to asymmetric currents and convection patterns in the two hemispheresWe used the Lyon-Fedder-Mobarry global magnetohydrodynamics model to study the effects of the interplanetary magnetic field (IMF) IMF By component on the coupling between the solar wind…P. Tenfjord, N. Østgaard, K. Snekvik et al.·Jun 3, 2016SaveLearn
Transport and entry of plasma clouds/jets across transverse magnetic discontinuities: Three-dimensional electromagnetic particle-in-cell simulationsIn this paper we use three-dimensional electromagnetic particle-in-cell simulations to investigate the interaction of a small-Larmor radius plasma cloud/jet with a transverse non-uniform magnetic…Gabriel Voitcu, Marius Echim·Jun 2, 2016SaveLearn
Relative contribution of the magnetic field barrier and solar wind speed in ICME-associated Forbush decreasesWe study 50 cosmic ray Forbush decreases (FDs) from the Oulu neutron monitor data during 1997-2005 that were associated with Earth-directed interplanetary coronal mass ejections (ICMEs). Such events…Ankush Bhaskar, Prasad Subramanian, Geeta Vichare·May 31, 2016SaveLearn
Estimation of cold plasma outflow during geomagnetic stormsLow-energy ions of ionospheric origin constitute a significant contributor to the magnetospheric plasma population. Measuring cold ions is difficult though. Observations have to be done at…S. Haaland, A. Eriksson, M. André et al.·May 31, 2016SaveLearn
What controls the local time extent of flux transfer events?Flux transfer events (FTEs) are the manifestation of bursty and/or patchy magnetic reconnection at the magnetopause. We compare two sequences of the ionospheric signatures of flux transfer events…S. E. Milan, S. M. Imber, J. A. Carter et al.·May 31, 2016SaveLearn
The impact of sunlight on high-latitude equivalent currentsGround magnetic field measurements can be mathematically related to an overhead ionospheric equivalent current. In this study we look in detail at how the global equivalent current, calculated using…K. M. Laundal, J. W. Gjerloev, N. Østgaard et al.·May 31, 2016SaveLearn
Time domain simulations of preliminary breakdown pulses in natural lightningLightning discharge is a complicated process with relevant physical scales spanning many orders of magnitude. In an effort to understand the electrodynamics of lightning and connect physical…B. E. Carlson, C. Liang, P. Bitzer et al.·May 30, 2016SaveLearn
Hybrid Perturbation methods based on Statistical Time Series modelsIn this work we present a new methodology for orbit propagation, the hybrid perturbation theory, based on the combination of an integration method and a prediction technique. The former, which can be…Juan Félix San-Juan, Montserrat San-Martín, Iván Pérez et al.·May 29, 2016SaveLearn
Determination of the Total Solar Modulation Factors in the Heliosphere For Cosmic Ray Protons and Electrons by Comparing Interstellar Spectra Deduced from Voyager Measurements and PAMELA Spectra of These Particles at the EarthWe have determined the interstellar spectra of cosmic ray protons and electrons from a few MeV to ~10 GeV. These interstellar spectra are based on Voyager data and a normalization of specific…W. R. Webber·May 26, 2016SaveLearn
The interaction between transpolar arcs and cusp spotsTranspolar arcs and cusp spots are both auroral phenomena which occur when the interplanetary magnetic field is northward. Transpolar arcs are associated with magnetic reconnection in the…R. C. Fear, S. E. Milan, J. A. Carter et al.·May 26, 2016SaveLearn
Analysis of global Terrestrial Gamma Ray Flashes distribution and special focus on AGILE detections over South AmericaGlobal distribution of the Terrestrial Gamma-ray Flashes (TGFs) detected by AGILE and RHESSI for the period from March 2009 to July 2012 has been analysed. A fourth TGF production region has been…Ferran Fabró, Joan Montanyà, Martino Marisaldi et al.·May 26, 2016SaveLearn
Enhanced detection of terrestrial gamma-ray flashes by AGILEAt the end of March 2015 the onboard software configuration of the AGILE satellite was modified in order to disable the veto signal of the anticoincidence shield for the minicalorimeter instrument.…M. Marisaldi, A. Argan, A. Ursi et al.·May 25, 2016SaveLearn
A statistical model of three-dimensional anisotropy and intermittency in strong Alfvénic turbulenceWe propose a simple statistical model of three-dimensionally anisotropic, intermittent, strong Alfvénic turbulence, incorporating both critical balance and dynamic alignment. Our model is based on…A. Mallet, A. A. Schekochihin·May 24, 2016SaveLearn
An altitude and distance correction to the source fluence distribution of TGFsThe source fluence distribution of terrestrial gamma ray flashes (TGFs) has been extensively discussed in recent years, but few have considered how the TGF fluence distribution at the source, as…R. S. Nisi, N. Østgaard, T. Gjesteland et al.·May 24, 2016SaveLearn
Collisionless Isotropization of the Solar-Wind Protons by Compressive Fluctuations and Plasma InstabilitiesCompressive fluctuations are a minor yet significant component of astrophysical plasma turbulence. In the solar wind, long-wavelength compressive slow-mode fluctuations lead to changes in…Daniel Verscharen, Benjamin D. G. Chandran, Kristopher G. Klein et al.·May 23, 2016SaveLearn
Meter-scale spark X-ray spectrumstatisticsX-ray emission by sparks implies bremsstrahlung from a population of energetic electrons, but the details of this process remain a mystery. We present detailed statistical analysis of X-ray spectra…B. E. Carlson, N. Østgaard, P. Kochkin et al.·May 18, 2016SaveLearn
Observation of intrinsically bright terrestrial gamma ray flashes from the Mediterranean basinWe present three terrestrial gamma ray flashes (TGFs) observed over the Mediterranean basin by the Reuven Ramaty High Energy Solar Spectroscope Imager (RHESSI) satellite. Since the occurrence of…T. Gjesteland, N. Østgaard, S. Laviola et al.·May 18, 2016SaveLearn
A new population of terrestrial gamma-ray flashes in the RHESSI dataTerrestrial gamma-ray flashes (TGFs) are the most energetic photon phenomenon occurring naturally on Earth. An outstanding question is as follows: Are these flashes just a rare exotic phenomenon or…N. Østgaard, K. H. Albrechtsen, T. Gjesteland et al.·May 18, 2016SaveLearn
Characterization of Saturn's bow shock: Magnetic field observations of quasi-perpendicular shocksCollisionless shocks vary drastically from terrestrial to astrophysical regimes resulting in radically different characteristics. This poses two complexities. Firstly, separating the influences of…A. H. Sulaiman, A. Masters, M. K. Dougherty·May 16, 2016SaveLearn
Empirical probability model of the cold plasma environment in Jovian inner magnetosphereA new empirical, analytical model of cold plasma (< 10 keV) in the Jovian inner magnetosphere is constructed. Plasmas in this energy range impact surface charging. A new feature of this model is…Yoshifumi Futaana, Xiao-Dong Wang, Elias Roussos et al.·May 16, 2016SaveLearn
A Wavelet Based Approach to Solar--Terrestrial CouplingTransient and recurrent solar activity drive geomagnetic disturbances; these are quantified (amongst others) by DST, AE indices time-series. Transient disturbances are related to the Interplanetary…Ch. Katsavrias, A. Hillaris, P. Preka--Papadema·May 12, 2016SaveLearn
Spectral properties of large gradual solar energetic particle events - II -Systematic Q/M-dependence of heavy ion spectral breaksWe fit the 0.1-500 MeV/nucleon H-Fe spectra in 46 large SEP events surveyed by Desai et al. (2016) with the double power-law Band function to obtain a normalization constant, low- and…M. I. Desai, G. M. Mason, M. A. Dayeh et al.·May 12, 2016SaveLearn
Relativistic electrons from sparks in the laboratoryDischarge experiments were carried out at the Eindhoven University of Technology in 2013. The experimental setup was designed to search for electrons produced in meter-scale sparks using a 1 MV Marx…N. Østgaard, B. E. Carlson, R. S. Nisi et al.·May 12, 2016SaveLearn
Ion collisional transport coefficients in the solar wind at 1 AUProton and alpha particle collisional transport coefficients (isotropization, relative deceleration frequencies and heating rates) at 1 AU are quantified using the WIND/SWE data. In agreement with…Petr Hellinger·May 3, 2016SaveLearn