Unique Observations of a Geomagnetic SI+ -- SI- Pair: Solar Sources and Associated Solar Wind FluctuationsThe paper describes the occurrence of a pair of oppositely directed sudden impulses (SI), in the geomagnetic field (ΔX), at ground stations, called SI+ -- SI- pairs, that occurred…R. G. Rastogi, P. Janardhan, K. Ahmed et al.·Sep 24, 2010SaveLearn
Solar Polar Fields During Cycles 21 --- 23: Correlation with Meridional FlowsWe have examined polar magnetic fields for the last three solar cycles, viz., cycles 21, 22 and 23 using NSO Kitt Peak synoptic magnetograms. In addition, we have used SoHO/MDI magnetograms…P. Janardhan, Kumar Bisoi Susanta, S. Gosain·Sep 22, 2010SaveLearn
Comment on "Are periodic solar wind number density structures formed in the solar corona?" by N. M. Viall et al., 2009, Geophys. Res. Lett., 36, L23102, doi:10.1029/2009GL041191Location of formation of periodic solar wind number density structures is discussed. Observation of proton and alpha anticorrelation in these structures [Viall et al., 2009] indicates that taking…Yuri I. Yermolaev·Sep 13, 2010SaveLearn
Modulation of waves due to charge-exchange collisions in magnetized partially ionized space plasmaA nonlinear time dependent fluid simulation model is developed that describes the evolution of magnetohydrodynamic waves in the presence of collisional and charge exchange interactions of a partially…Dastgeer Shaikh, G. P. Zank·Sep 9, 2010SaveLearn
Is it plausible to expect a close encounter of the Earth with a yet undiscovered astronomical object in the next few years?We analytically and numerically investigate the possibility that a still undiscovered body X, moving along an unbound hyperbolic path from outside the solar system, may penetrate its inner regions in…Lorenzo Iorio·Sep 7, 2010SaveLearn
Anisotropy of Alfvénic Turbulence in the Solar Wind and Numerical SimulationsWe investigate the anisotropy of Alfvénic turbulence in the inertial range of slow solar wind and in both driven and decaying reduced magnetohydrodynamic simulations. A direct comparison is made by…C. H. K. Chen, A. Mallet, T. A. Yousef et al.·Sep 3, 2010SaveLearn
Dust in the Interplanetary MediumThe mass density of dust particles that form from asteroids and comets in the interplanetary medium of the solar system is, near 1 AU, comparable to the mass density of the solar wind. It is mainly…Ingrid Mann, Andrzej Czechowski, Nicole Meyer-Vernet et al.·Aug 10, 2010SaveLearn
Enhanced Magnetic Compressibility and Isotropic Scale-Invariance at Sub-Ion Larmor Scales in Solar Wind TurbulenceThe anisotropic nature of solar wind magnetic turbulence fluctuations is investigated scale-by-scale using high cadence in-situ magnetic field measurements from the Cluster and ACE spacecraft…Khurom H. Kiyani, Sandra C. Chapman, Fouad Sahraoui et al.·Aug 3, 2010SaveLearn
Hydrogen permitted lines in the first near-IR spectra of Th 28 microjet: accretion or ejection tracers?We report the first near-infrared detection of the bipolar microjet from TTauri star ThA 15-28 (aka Th 28). Spectra were obtained with VLT/ISAAC for the slit both perpendicular and parallel to the…Deirdre Coffey, Francesca Bacciotti, Linda Podio et al.·Jun 28, 2010SaveLearn
Investigation of Traveling Ionospheric Disturbances during a Midlatitude Spread F EventDuring a midlatitude spread F (MSF) event, data was collected to investigate the circumstances that may lead to MSF. Using the Total Electron Content (TEC) derived from the NCAT-SCINDA GPS station…Galen Smith, Abebe Kebede·Jun 17, 2010SaveLearn
Correlation functions of small-scale fluctuations of the interplanetary magnetic fieldThe Interplanetary Magnetic Field shows complex spatial and temporal variations. Single spacecraft measurements reveal only a one dimensional section of this rich four dimensional phenomenon.…Z. Németh, G. Facskó, E. A. Lucek·Jun 16, 2010SaveLearn
Sharp changes of solar wind ion flux and density within and outside current sheetsAnalysis of the Interball-1 spacecraft data (1995-2000) has shown that the solar wind ion flux sometimes increases or decreases abruptly by more than 20% over a time period of several seconds or…Olga Khabarova, Georgy Zastenker·Jun 12, 2010SaveLearn
Spacecraft charging and ion wake formation in the near-Sun environmentA three-dimensional (3-D), self-consistent code is employed to solve for the static potential structure surrounding a spacecraft in a high photoelectron environment. The numerical solutions show…R. E. Ergun, D. M. Malaspina, S. D. Bale et al.·Jun 4, 2010SaveLearn
An analytic model of plasma-neutral coupling in the heliosphere plasmaWe have developed an analytic model to describe coupling of plasma and neutral fluids in the partially ionized heliosphere plasma medium. The sources employed in our analytic model are based on a…Dastgeer Shaikh, B Dasgupta·May 31, 2010SaveLearn
Higher-order corrections to the relativistic perihelion advance and the mass of binary pulsarsWe study the general relativistic orbital equation and using a straightforward perturbation method and a mathematical device first introduced by d'Alembert, we work out approximate expressions of…Maurizio M. D'Eliseo·May 27, 2010SaveLearn
Dispersive magnetized waves in the solar wind plasmaWe derive a generalized linear dispersion relation of waves in a strongly magnetized, compressible, homogeneous and isotropic quasineutral plasma. Starting from a two fluid model, describing…Dastgeer Shaikh, B. Dasgupta, P. K. Shukla·May 26, 2010SaveLearn
From Micro- to Macro-scales in the Heliosphere and MagnetospheresFrom a broader perspective, the heliosphere and planetary magnetospheres provide a test bed to explore the plasma physics of the Universe. In particular, the underlying nonlinear coupling of…Dastgeer Shaikh, I. S. Veselovsky, Q. M. Lu et al.·May 26, 2010SaveLearn
Magnetic Tension of Sunspot Fine StructuresThe equilibrium structure of sunspots depends critically on its magnetic topology and is dominated by magnetic forces. Tension force is one component of the Lorentz force which balances the gradient…P. Venkatakrishnan, Sanjiv Kumar Tiwari·May 21, 2010SaveLearn
Observing stellar bow shocksFor stars, the bow shock is typically the boundary between their stellar wind and the interstellar medium. Named for the wave made by a ship as it moves through water, the bow shock wave can be…A. C. Sparavigna, R. Marazzato·May 10, 2010SaveLearn
Statistics of magnetic field fluctuations in a partially ionized space plasmaVoyager 1 and 2 data reveals that magnetic field fluctuations are compressive and exhibit a Gaussian distribution in the compressed heliosheath plasma, whereas they follow a lognormal…Dastgeer Shaikh·May 9, 2010SaveLearn
Impact of CIR Storms on Thermosphere Density Variability during the Solar Minimum of 2008The solar minimum of 2008 was exceptionally quiet, with sunspot numbers at their lowest in 75 years. During this unique solar minimum epoch, however, solar wind high - speed streams emanating from…Jiuhou Lei, Jeffrey P. Thayer, Wenbin Wang et al.·Apr 26, 2010SaveLearn
Collisionless reconnection: Mechanism of self-ignition in thin current sheetsThe spontaneous onset of magnetic reconnection in thin collisionless current sheets is shown to result from a thermal-anisotropy driven magnetic Weibel-mode, generating seed-magnetic field …R. A. Treumann, R. Nakamura, W. Baumjohann·Apr 22, 2010SaveLearn
Simulation of Flux Emergence from the Convection Zone to the CoronaHere, we present numerical simulations of magnetic flux buoyantly rising from a granular convection zone into the low corona. We study the complex interaction of the magnetic field with the turbulent…Fang Fang, Ward Manchester, William P. Abbett et al.·Mar 31, 2010SaveLearn
Kappa distributions: theory and applications in space plasmasParticle velocity distribution functions (VDF) in space plasmas often show non Maxwellian suprathermal tails decreasing as a power law of the velocity. Such distributions are well fitted by the…V. Pierrard, M. Lazar·Mar 18, 2010SaveLearn
SAI: a compact atom interferometer for future space missionsAtom interferometry represents a quantum leap in the technology for the ultra-precise monitoring of accelerations and rotations and, therefore, for all the science that relies on the latter…Fiodor Sorrentino, Kai Bongs, Philippe Bouyer et al.·Mar 7, 2010SaveLearn