GPS scintillation and irregularities at the front of an ionization tongue in the nightside polar ionosphereIn this paper we study a tongue of ionization (TOI) on 31 October 2011 which stretched across the polar cap from the Canadian dayside sector to Svalbard in the nightside ionosphere. The TOI front…Christer van der Meeren, Kjellmar Oksavik, Dag Lorentzen et al.·Jul 4, 2016SaveLearn
Observational evidence for temporary planetary wave forcing of the MLT during fall equinoxWe present direct observations of zonal wave numbers 1 and 2 planetary wave activity in the mesopause region derived from a longitudinal chain of high-latitude Northern Hemisphere (51-66N)…Nora H. Stray, Rosmarie J. deWit, Patrick J. Espy et al.·Jul 4, 2016SaveLearn
Observations of gravity wave forcing of themesopause region during the January 2013 major Sudden Stratospheric WarmingStudies of vertical and interhemispheric coupling during Sudden Stratospheric Warmings (SSWs) suggest that gravity wave (GW) momentum flux divergence plays a key role in forcing the middle…R. J. deWit, R. E. Hibbins, P. J. Espy et al.·Jul 4, 2016SaveLearn
Energy exchanges in reconnection outflowsReconnection outflows are highly energetic directed flows that interact with the ambient plasma or with flows from other reconnection regions. Under these conditions the flow becomes highly unstable…Giovanni Lapenta, Martin V. Goldman, Davd L. Newman et al.·Jul 2, 2016SaveLearn
Energetic electron precipitation into the middle atmosphere - Constructing the loss cone fluxes from MEPED POESThe impact of energetic electron precipitation (EEP) on the chemistry of the middle atmosphere (50-90 km) is still an outstanding question as accurate quantification of EEP is lacking due to…H. Nesse Tyssøy, M. I. Sandanger, L. -K. G. Ødegaard et al.·Jun 28, 2016SaveLearn
Dynamic effects of restoring footpoint symmetry on closed magnetic field linesHere we present an event where simultaneous global imaging of the aurora from both hemispheres reveals a large longitudinal shift of the nightside aurora of about 3 h, being the largest relative…J. P. Reistad, N. Østgaard, P. Tenfjord et al.·Jun 28, 2016SaveLearn
Lightning detection in planetary atmospheresLightning in planetary atmospheres is now a well-established concept. Here we discuss the available detection techniques for, and observations of, planetary lightning by spacecraft, planetary landers…Karen L Aplin, Georg Fischer·Jun 10, 2016SaveLearn
Sunward-propagating Alfvénic fluctuations observed in the heliosphereThe mixture/interaction of anti-sunward-propagating Alfvénic fluctuations (AFs) and sunward-propagating Alfvénic fluctuations (SAFs) is believed to result in the decrease of the Alfvénicity of solar…H. Li, C. Wang, J. W. Belcher et al.·Jun 10, 2016SaveLearn
Erupting filaments with large enclosing flux tubes as sources of high-mass 3-part CMEs, and erupting filaments in the absence of enclosing flux tubes as sources of low-mass unstructured CMEsThe 3-part appearance of many CMEs arising from erupting filaments emerges from a large magnetic flux tube structure, consistent with the form of the erupting filament system. Other CMEs arising from…Joe Hutton, Huw Morgan·Jun 10, 2016SaveLearn
A Study of the B/C Ratio Between 10 MeV/nuc and 1 TeV/nuc in Cosmic Rays Using New Voyager and AMS-2 Data and a Comparison with the Predictions of Leaky Box Propagation ModelsThis paper seeks to find an explanation of the galactic cosmic ray B/C ratio newly measured in cosmic rays between ~10 MeV/nuc and 1 TeV/nuc. Voyager measurements of this ratio at low energies and…W. R. Webber, T. L. Villa·Jun 9, 2016SaveLearn
Multi-Species Measurements of the Firehose and Mirror Instability Thresholds in the Solar WindThe firehose and mirror instabilities are thought to arise in a variety of space and astrophysical plasmas, constraining the pressure anisotropies and drifts between particle species. The plasma…C. H. K. Chen, L. Matteini, A. A. Schekochihin et al.·Jun 8, 2016SaveLearn
Swarm in situ observations of F region polar cap patches created by cusp precipitationHigh-resolution in situ measurements from the three Swarm spacecraft, in a string-of-pearls configuration, provide new insights about the combined role of flow channel events and particle impact…L. V. Goodwin, B. Iserhienrhien, D. M. Miles et al.·Jun 7, 2016SaveLearn
A large-scale view of Space Technology 5 magnetometer response to solar wind driversIn this data report we discuss reprocessing of the Space Technology 5 (ST5) magnetometer database for inclusion in NASA's Coordinated Data Analysis Web (CDAWeb) virtual observatory. The mission…D. J. Knipp, L. M. Kilcommons, J. Gjerloev et al.·Jun 7, 2016SaveLearn
Spatial structure and temporal evolution of energetic particle injections in the inner magnetosphere during the 14 July 2013 substorm eventRecent results by the Van Allen Probes mission showed that the occurrence of energetic ion injections inside geosynchronous orbit could be very frequent throughout the main phase of a geomagnetic…Matina Gkioulidou, S. Ohtani, D. G. Mitchell et al.·Jun 7, 2016SaveLearn
Network analysis of geomagnetic substorms using the SuperMAG database of ground-based magnetometer stationsThe overall morphology and dynamics of magnetospheric substorms is well established in terms of the observed qualitative auroral features seen in ground-based magnetometers. This paper focuses on the…J. Dods, S. C. Chapman, J. W. Gjerloev·Jun 7, 2016SaveLearn
Scintillation and loss of signal lock from poleward moving auroral forms in the cusp ionosphereWe present two examples from the cusp ionosphere over Svalbard,where poleward moving auroral forms (PMAFs) are causing significant phase scintillation in signals from navigation satellites. The data…K. Oksavik, C. van der Meeren, D. A. Lorentzen et al.·Jun 7, 2016SaveLearn
An extensive survey of dayside diffuse aurora based on optical observations at Yellow River StationBy using 7 years optical auroral observations obtained at Yellow River Station (magnetic latitude 76.24\, CN) at Ny-Alesund, Svalbard, we performed the first extensive survey for the…De-Sheng Han, Xiang-Cai Chen, Jian-Jun Liu et al.·Jun 7, 2016SaveLearn
Severe and localized GNSS scintillation at the poleward edge of the nightside auroral oval during intense substorm auroraIn this paper we study how GPS, GLONASS, and Galileo navigation signals are compromised by strong irregularities causing severe phase scintillation (σϕ > 1) in the nightside…Christer van der Meeren, Kjellmar Oksavik, Dag A. Lorentzen et al.·Jun 7, 2016SaveLearn
A new technique for determining Substorm Onsets and Phases from Indices of the Electrojet (SOPHIE)We present a new quantitative technique that determines the times and durations of substorm expansion and recovery phases and possible growth phases based on percentiles of the rate of change of…C. Forsyth, I. J. Rae, J. C. Coxon et al.·Jun 7, 2016SaveLearn
Birkeland current effects on high-latitude groundmagnetic field perturbationsMagnetic perturbations on ground at high latitudes are directly associated only with the divergence-free component of the height-integrated horizontal ionospheric current, J,df.…K. M. Laundal, S. E. Haaland, N. Lehtinen et al.·Jun 7, 2016SaveLearn
What is the appropriate coordinate system for magnetometer data when analyzing ionospheric currents?In this paper we investigate which coordinate representation is most appropriate when analyzing ground magnetometer data in terms of ionospheric currents, in particular the westward electrojet. The…K. M. Laundal, J. W. Gjerloev·Jun 6, 2016SaveLearn
Characteristics of the flankmagnetopause: Cluster observationsThe magnetopause is a current sheet forming the boundary between the geomagnetic field on one side and the shocked solar wind on the other side. This paper discusses properties of the low-latitude…S. Haaland, J. Reistad, P. Tenfjord et al.·Jun 6, 2016SaveLearn
Intensity asymmetries in the dusk sector of the poleward auroral oval due to IMF BxIn the exploration of global-scale features of the Earth's aurora, little attention has been given to the radial component of the Interplanetary Magnetic Field (IMF). This study investigates the…J. P. Reistad, N. Østgaard, K. M. Laundal et al.·Jun 6, 2016SaveLearn
Distribution of energetic oxygen and hydrogen in the near-Earth plasma sheetThe spatial distributions of different ion species are useful indicators for plasma sheet dynamics. In this statistical study based on 7 years of Cluster observations, we establish the spatial…E. A. Kronberg, E. E. Grigorenko, S. E. Haaland et al.·Jun 6, 2016SaveLearn
Solar illumination control of ionospheric outflow above polar cap arcsWe measure the flux density, composition, and energy of outflowing ions above the polar cap, accelerated by quasi-static electric fields parallel to the magnetic field and associated with polar cap…L. Maes, R. Maggiolo, J. De Keyser et al.·Jun 3, 2016SaveLearn