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On the Incidence of Kelvin-helmholtz Instability for Mass Exchange...

By: G. Chanteur; R. Smets; D. Delcourt; T. E. Moore

Description: NASA/Goddard Space Flight Center, Greenbelt, MD, USA. Due to the velocity shear imposed by the solar wind flowing around the magnetosphere, the magnetopause flanks are preferred regions for the development of a Kelvin-Helmholtz instability. Since its efficiency for momentum transfer across the magnetopause has already been established, we investigate its efficiency for mass transfer. Using nonresistive magnetohydrodynamic simulations to describe th...

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Polar Cap Arcs from the Magnetosphere to the Ionosphere: Kinetic M...

By: Y. Zhang; G. Lointier; C. Simon Wedlund; J.-g. Trotignon; D. Fontaine; R. Maggiolo; M. Echim

Description: Belgian Institute for Space Aeronomy (BIRA-IASB), Space Plasma, Brussels, Belgium. On 1 April 2004 the GUVI imager onboard the TIMED spacecraft spots an isolated and elongated polar cap arc. About 20 min later, the Cluster satellites detect an isolated upflowing ion beam above the polar cap. Cluster observations show that the ions are accelerated upward by a quasi-stationary electric field. The field-aligned potential drop is estimated to about 700 V an...

Ajello, J. M. and Shemansky, D. E.: A reexamination of important N2 cross sections by electron impact with application to the dayglow – The Lyman-Birge-Hopfield band system and N I (1199.99 nm), J. Geophys. Res., 90, 9845–9861, 1985.; Anderson Jr., D. E., Meier, R. R., Feldman, P. D., and Gentieu, E. P.: The UV dayglow 3, OI emissions at 989, 1027, 1152, 1304, and 1356A, Geophys. Res. Lett., 7, 1057–1060, 1980.; Avakyan, S. V. (Ed.): Collision processes and ex...

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Magnetosphere-ionosphere Coupling Currents in Jupiter’s Middle Mag...

By: J. D. Nichols; S. W. H. Cowley

Description: Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK. The amplitude and spatial distribution of the coupling currents that flow between Jupiter’s ionosphere and middle magnetosphere, which enforce partial corotation on outward-flowing iogenic plasma, depend on the values of the effective Pedersen conductivity of the jovian ionosphere and the mass outflow rate of iogenic plasma. The values of these parameters are, howe...

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Simulation of Field-aligned H+ and He+ Dynamics During Late-stage ...

By: J. D. Huba; J. A. Fedder; J. Krall

Description: Plasma Physics Div., Naval Research Lab., Code 6790, 4555 Overlook Ave., SW, Washington, D.C., 20375-5346, USA. The refilling of the plasmasphere for 3≤L≤4 following a model storm is simulated over long times (days) using the NRL ionosphere code SAMI2 (Sami2 is Another Model of the Ionosphere). Refilling is dependent on the supply of topside H+ and He+ ions with the result that H+ refilling rates decrease and He

Angerami, J. J. and Thomas, J. O.: The distribution of electrons and ions in the Earth's exosphere, J. Geophys. Res., 69, 4537–4560, 1964.; Banks, P. M., Nagy, A. F., and Axford, W. I.: Dynamical behavior of thermal protons in the mid-latitude ionosphere and magnetosphere, Planet. Space Sci., 19, 1053–1067, 1971.; Burch, J. L.: IMAGE mission overview, Space Sci. Rev., 91, 1–14, 2000.; Carpenter, D. L.: Whistler studies of the plasmapause in the magnetosphere, I: Temporal...

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Characteristics of Vlf Atmospherics Near the Resonance Frequency o...

By: A. P. Nickolaenko; T. Raita; E. E. Titova; T. Turunen; A. A. Ostapenko; J. Manninen

Description: Polar Geophysical Institute, Kola Scientific Centre of Russian Academy of Sciences, Apatity 184200, Russia. Recordings of ELF-VLF waves with the right-hand (RH) and the left-hand (LH) circular polarization were made in Northern Finland. Analysis showed a difference between the RH and LH polarized waves. A pronounced maximum of the wave amplitude was observed at the first critical frequency of the Earth-ionosphere waveguide (the first transverse resonanc...

Belyaev, P. P., Buzunkin, A. A., and Lisov, A. A.: Structure of electromagnetic noise spectra in waveguide Earth-ionosphere at frequency (1–10) kHz., in The low frequency Earth-ionosphere waveguide, Publishing house Gylym, 90–96, 1991.; Budden, K. G.: Radio waves in the ionosphere, Cambridge University press., 1961.; Brundell, J. B., Rodger, C. J., and Dowden, R. L.: Validation of single-station lightning location technique, Radio Sci., 37(4), 12-1, 1059, doi:10.1029/200...

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Intercalibration of Hrdi and Windii Wind Measurements : Volume 15,...

By: W. R. Skinner; P. B. Hays; M. D. Burrage

Description: Space Physics Research Laboratory, University of Michigan, Ann Arbor, MI 48109, USA. The High Resolution Doppler Imager (HRDI) and the Wind Imaging Interferometer (WINDII) in- struments, which are both on the Upper Atmosphere Research Satellite, measure winds by sensing the Doppler shift in atmospheric emission features. Because the two observation sets are frequently nearly coincident in space and time, each provides a very e.ective validation test o...

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Double Star Tc-1 Observations of Component Reconnection at the Day...

By: Z. Y. Huang; T. L. Zhang; X. G. Zhang; C. J. Xiao; Z. X. Liu; I. Dandouras; X. G. Wang; A. Fazakerley; H. Zhang; H. Réme; C. M. Carr; S. Y. Fu; Z. Y. Pu; M. W. Dunlop; T. Phan; Q. G. Zong

Description: School of Earth and Space Sciences, Peking University, Beijing 100871, China. In spring 2004 Double Star TC-1 measured a number of reconnection signatures at the dayside low-latitude magnetopause (MP) when there was a notable By component in the magnetosheath. In a number of events we can show that reconnection was operating nearby TC-1 in the subsolar MP region. In this paper we describe three representative events: (a) event on 21 Ma...

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Mu Head Echo Observations of the 2010 Geminids: Radiant, Orbit, an...

By: J. Kero; T. Nakamura; C. Szasz

Description: Swedish Institute of Space Physics (IRF), P.O. Box 812, 981 28 Kiruna, Sweden. We report Geminid meteor head echo observations with the high-power large-aperture (HPLA) Shigaraki middle and upper atmosphere (MU) radar in Japan (34.85° N, 136.10° E). The MU radar observation campaign was conducted from 13 December 2010, 08:00 UTC to 15 December, 20:00 UTC and resulted in 48 h of radar data. A total of ~ 270 Geminids were observed among ~ 8800 meteor head ...

Brown, P., Wong, D. K., Weryk, R. J., and Wiegert, P.: A meteoroid stream survey using the Canadian Meteor Orbit Radar. II: Identification of minor showers using a 3D wavelet transform, Icarus, 207, 66–81, doi:10.1016/j.icarus.2009.11.015, 2010.; Blaauw, R. C., Campbell-Brown, M. D., and Weryk, R. J.: A meteoroid stream survey using the Canadian Meteor Orbit Radar – III. Mass distribution indices of six major met...

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Multifractal Structure of Turbulence in the Magnetospheric Cusp : ...

By: E. Yordanova; A. W. Wernik; K. Stasiewicz; M. Grzesiak; B. Popielawska

Description: Space Research Center, Polish Academy of Sciences, Poland. Magnetospheric cusps are regions which are characterized by highly turbulent plasma. We have used Polar magnetic field data to study the structure of turbulence in the cusp region. The wavelet transform modulus maxima method (WTMM) has been applied to estimate the scaling exponent of the partition function and singularity spectra. Their features are similar to those found in the nonlinear multif...

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Quasi-biennial and Quasi-triennial Oscillations in Geomagnetic Act...

By: R. P. Kane

Description: Instituto Nacional de Pesquisas Espacias - INPE, Caixa Postal 515, 12201-970 − São José dos Campos, SP, Brasil. Data for geomagnetic activity index aa for 1868–1994 were subjected to spectral analysis for 12 intervals each of 11 consecutive years. In each interval, QBO and QTO (quasi-biennial and quasi-triennial oscillations) were observed at ~2.00, 2.15, 2.40, 2.70 y and ~3.20, 3.40 y, but not all in all intervals. These fluctuations are absent near (2–...

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Solar Zenith Angle Dependencies of F1-layer, NmF2 Negative Disturb...

By: V. V. Lobzin; A. V. Pavlov

Description: Institute of Terrestrial Magnetism, Ionosphere, and Radio-Wave Propagation, Russian Academy of Sciences (IZMIRAN), Troitsk, Moscow Region, 142190, Russia. Experimental data acquired by the Ionospheric Digital Database of the National Geophysical Data Center, Boulder, Colorado, from 1957 to 1990, are used to study the dependence of the G condition, F1-layer, and NmF2 negative disturbance occurrence probabilities on the solar zenith angle during...

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Cluster Survey of the High-altitude Cusp Properties: a Three-year ...

By: A. Grigoriev; E. Budnik; A. Fedorov; P. J. Cargill; B. Lavraud; A. Balogh; H. Rème; M. W. Dunlop; I. Dandouras

Description: Centre d’Etude Spatiale des Rayonnements, 9 ave du Colonel Roche, 31028 Toulouse Cedex 4,Toulouse, France. The global characteristics of the high-altitude cusp and its surrounding regions are investigated using a three-year statistical survey based on data obtained by the Cluster spacecraft. The analysis involves an elaborate orbit-sampling methodology that uses a model field and takes into account the actual solar wind conditions and level of geomagneti...

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A Multi-diagnostic Approach to Understanding High-latitude Plasma ...

By: I. McCrea; C. N. Mitchell; T. Pedersen; P. Spencer; P. Yin

Description: Department of Electronic and Electrical Engineering, University of Bath, Bath, BA2 7AY, UK. During the Halloween 2003 storm event, significant electron density enhancements at elevated F-layer altitudes were recorded by the EISCAT and ESR radars in northern Europe between 20:00 and 24:00 UT on 30 October. At the same time, a sequence of optical images from Qaanaaq in northern Greenland captured a series of eastward-propagating polar cap patches. In this ...

Bust, G. S. and Mitchell, C. N.: History, current state, and future directions of ionospheric imaging, Rev. Geophys., 46, RG1003, doi:10.1029/2006RG000212, 2008.; Crowley, G.: Critical review of ionospheric patches and blobs, edited by: Stone, W. R., Rev. Radio Sci., 1993–1996, 1996.; Doherty, P., Coster, A. J., and Murtagh, W.: Eye on the ionosphere: space weather effects of October–November 2003, GPS Solutions, 8(4), 267–271, doi:10.1007/s10291-004-0109-3, 2004.; Foste...

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Probing Discrete Auroral Arcs by Ionospheric Tomography : Volume 1...

By: L. Kersley; S. T. Berry; B. Lybekk; J. Moen

Description: The University Courses on Svalbard (UNIS), PO Box 156, N-9170 Longyearbyen, Norway. Optical observations of 557.7 nm and 630.0 nm emissions from discrete auroral arcs in the post-noon sector have been related to localised field-aligned enhancements in the spatial distribution of E- and F-layer electron density respectively seen in images reconstructed by ionospheric tomography. Results from two case studies are presented in which meridian scanning photo...

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Sas Wave Experiment on Board Magion 4 : Volume 15, Issue 5 (30/11/...

By: J. Vojta; J. Juchniewicz; J. Błęcki; S. Gadomski; V. Korepanov; J. Słomiński; R. Wronowski; Z. Krawczyk; P. Triska; S. Savin

Description: Space Research Centre PAS, Bartycka 18A ,00716, Warsaw, Poland. A short description of the SAS (subsatellite analyser of spectra) wave experiment on board the Magion-4 subsatellite is given. We present first measurements of the magnetic-field fluctuations in the frequency range 32–2000 Hz obtained in the magnetotail during the disturbed period at the magnetopause and in the polar cusp.

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Dual Source Populations of Substorm-associated Ring Current Ions :...

By: H. Rème; Y. Ebihara; I. Dandouras; M. Yamauchi

Description: Swedish Institute of Space Physics, Kiruna, Sweden. Sources of low-energy ring current ions in the early morning sector (eastward drifting energy domain of about <5 keV) are examined using both statistical analyses and numerical tracing methods (phase-space mapping and simulation). In about 90% of Cluster perigee traversals at 02~07 local time, these low-energy ring current ions have dual ion populations: one is wedge-like energy-dispersed ions, and the...

Alfvén, H. and Fälthammar, C.-G.: Cosmical Electrodynamics, Fundamental Principles, Clarendon, Oxford, 1963.; Ebihara, Y., Yamauchi, M., Nilsson, H., Lundin, R., and Ejiri, M.: Wedge-like dispersion of sub-keV ions in the dayside magnetosphere: Particle simulation and Viking observation, J. Geophys. Res., 106, 29571–29584, 2001.; Ejiri, M., Hoffman, R. A., and Smith, P. H.: Energetic particle penetration into the inner magnetosphere, J. Geophys. Res., 85(A2), 653–663, 19...

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Generation of Large-scale Equatorial F-region Plasma Depletions Du...

By: Y. Otsuka; A. A. Pimenta; J. R. Abalde; P. R. Fagundes; V. H. Rios; J. A. Bittencourt; Y. Sahai

Description: Universidade do Vale do Paraiba (IPD), Av. Shishima Hifumi 2911,12244-000 S. J. Campos, SP, Brazil. All-sky imaging observations of the F-region OI 630nm nightglow emission allow us to visualize large-scale equatorial plasma depletions, generally known as trans-equatorial plasma bubbles. Strong range type spread-F is the radio signature of these (magnetically) north-south aligned plasma depletions. An extensive database of the OI 630nm emission all-sky im...

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Spatio-temporal Structure of Alfvén Waves Excited by a Sudden Impu...

By: K.-h. Glassmeier; P. N. Mager; D. Yu. Klimushkin

Description: The Institute of Solar-Terrestrial Physics of Siberian Branch of Russian Academy of Sciences, P.O. Box 291, 664033 Irkutsk, Russia. This paper is concerned with the spatial structure and temporal evolution of the azimuthally small scale Alfvén wave generated by a sudden impulse concentrated on a given magnetic shell. At the outset, both poloidal and toroidal components are present in the wave's magnetic field. The oscillation in the poloidal component on...

Agapitov, O., Glassmeier, K.-H., Plaschke, F., Auster, H.-U., Constantinescu, D., Angelopoulos, V., Magnes, W., Nakamura, R., Carlson, C. W., Frey, S., and McFadden, J. P.: Surface waves and field line resonances: A THEMIS case study, J. Geophys. Res., 114, A00C27, doi:10.1029/2008JA013553, 2009.; Chen, L. and Hasegawa, A.: A theory of long period magnetic pulsation. 2. Impulse excitation of surface eigenmode, J. Geophys...

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