Browsing UMBC Goddard Planetary Heliophysics Institute (GPHI) by Issue Date
Now showing items 1-20 of 115
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Evidence of high-latitude reconnecting during northward IMF: Hawkeye observations
(American Geophysical Union, 1996-03-01)Reconnection is accepted as an important process for driving the solar wind/magnetospheric interaction although it is not fully understood. In particular, reconnection for northward interplanetary magnetic field (IMF) at ... -
Modelling the Low-Altitude Trapped Radiation Environment
(Astrophysics Data Systems, 1996-09-18)Knowledge of the trapped energetic particle radiation at low altitudes (<1000 km), particularly in the vicinity of the South Atlantic Magnetic Anomaly region, is important for studying the space environmental effects on ... -
Exterior and interior polar cusps: Observations from Hawkeye
(American Geophysical Union, 1997-06-01)Hawkeye plasma, magnetic field, and plasma wave instruments directly sampled the throat of the northern polar cusp as the orientation of the interplanetary magnetic field (IMF) changed from southward to northward on July ... -
Ion temperature anisotropies in the Earth's high-latitude magnetosheath: Hawkeye observations
(American Geophysical Union, 1998-03-01)We present here for the first time observations of the inverse correlation between the ion temperature anisotropy and plasma beta in the Earth's high-latitude magnetosheath. Hot proton data with energies of 0.3–8 keV were ... -
Spatial distributions of the inner radiation belt electrons: A comparison between observations and radial diffusion theory predictions
(Elsevier, 1998-05-20)It is well known that the quiet-time electron radiation belts exhibit a two-zone radial structure. Although the inner radiation belt does show dynamic variations during geomagnetically active periods, the stably trapped ... -
Time correlation of low-altitude relativistic trapped electron fluxes with solar wind speeds
(American Geophysical Union, 1998-07-01)We present the results from a study of time correlation between the low-altitude relativistic trapped electron fluxes and the solar wind speeds. Our trapped electron observations in the energy range of 0.19–3.2 MeV were ... -
An investigation of the spatial variations of the energetic trapped electrons at low altitudes
(Elsevier, 1998-08-27)We have analyzed the trapped electron data (0.19–3.2 MeV) taken by the Japanese OHZORA satellite operated at 350–850 km altitude in polar orbit during 1984–1987 near solar minimum. The electron observations reveal all the ... -
An alternative drift shell parameter for modeling trapped particles
(Elsevier, 1999-11-08)The McIlwain L parameter has been widely used to label magnetic drift shells of trapped particles. In a dipolar magnetic field, L gives the equatorial radius of a drift shell. When the total magnetospheric magnetic field ... -
Observation of magnetospheric relativistic electrons accelerated by Pc-5 ULF waves
(American Geophysical Union, 2004-07-20)Magnetic field, electric field and energetic electron measurements from CRRES, GOES-6 and -7 satellites are used to investigate the production of up to 2 MeV electron fluxes through a storm sudden commencement (SSC) event ... -
Investigation of 3D Energetic Particle Transport Inside Quiet-Time Magnetosphere Using Particle Tracing in Global MHD Model
(American Geophysical Union, 2005-01-01) -
Development of a magnetospheric state-based trapped radiation database
(Elsevier, 2005-07-05)At the core of any empirical trapped radiation model is a database containing energetic particle observations. The usefulness of such a database and the performance of the resulting models depend on the database flexibility ... -
Long-term variations of the electron slot region and global radiation belt structure
(American Geophysical Union, 2006-02-22)We report the observations of changes of the nominal position of the quiet-time radiation belt slot over the solar cycles. It has been found that the slot region, believed to be a result of enhanced precipitation losses ... -
Bulk Flow Velocity and First-Order Anisotropy of Solar Energetic Particles Observed on the Wind Spacecraft: Overview of Three "Gradual" Particle Events
(IOP Publishing, 2007-02-17)We have developed techniques to calculate bulk flow velocity and first-order anisotropy of solar energetic particles (SEPs) with MeV nucleon-1 energies as recorded on the Wind spacecraft. Using the techniques we selected ... -
Ion Anisotropy and High-Energy Variability of Large Solar Particle Events: A Comparative Study
(IOP Publishing, 2008-01-09)We have made comparative studies of ion anisotropy and high-energy variability of solar energetic particle (SEP) events previously examined by the Solar, Heliospheric, and Interplanetary Environment (SHINE) Workshop campaign. ... -
Kinetic Structure of the Electron Diffusion Region in Antiparallel Magnetic Reconnection
(American Physical Society, 2011-02-10)Strong electron pressure anisotropy has been observed upstream of electron diffusion regions during reconnection in Earth’s magnetotail and kinetic simulations. For collisionless antiparallel reconnection, we find that the ... -
Relativistic electron acceleration by compressional-mode ULF waves: Evidence from correlated Cluster, Los Alamos National Laboratory spacecraft, and ground-based magnetometer measurements
(American Geophysical Union, 2011-07-28)Simultaneous observations by Cluster and Los Alamos National Laboratory (LANL) spacecraft and Canadian Array for Real-Time Investigations of Magnetic Activity and International Monitor for Auroral Geomagnetic Effects ... -
Phase space structure of the electron diffusion region in reconnection with weak guide fields
(AIP Publishing, 2012-11-12)Kinetic simulations of magnetic reconnection provide detailed information about the electric and magnetic structure throughout the simulation domain, as well as high resolution profiles of the essential fluid parameters ... -
Current sheets and pressure anisotropy in the reconnection exhaust
(AIP Publishing, 2014-01-14)A particle-in-cell simulation shows that the exhaust during anti-parallel reconnection in the collisionless regime contains a current sheet extending 100 inertial lengths from the X line. The current sheet is supported by ... -
Self-organisation Processes In The Carbon ARC For Nanosynthis
(US Department of Energy Office of Scientific and Technical Information, 2014-02-26)The atmospheric pressure carbon arc in inert gases such as helium is an important method for the production of nanomaterials. It has recently been shown that the formation of the carbon deposit on the cathode from gaseous ... -
Self-organisation processes in the carbon arc for nanosynthesis
(AIP Publishing, 2015-02-13)The atmospheric pressure carbon arc in inert gases such as helium is an important method for the production of nanomaterials. It has recently been shown that the formation of the carbon deposit on the cathode from gaseous ...