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Foreword by the Chairman of the Eiscat Council : Volume 20, Issue ...

By: Mike Lockwood
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Eiscat/Crres Observations: Nightside Ionospheric Ion Outflow and O...

By: C. H. Perry; S. Coles; M. Grande; H. Opgenoorth; A. D. Aylward; B. Wilken; R. J. Bunting; N. G. J. Gazey; M. Lockwood; P. N. Smith

Description: Rutherford Appleton Laboratory, Chilton, Oxfordshire, OX11 0QX, UK. We present combined observations made near midnight by the EISCAT radar, all-sky cameras and the combined released and radiation efects satellite (CRRES) shortly before and during a substorm. In particular, we study a discrete, equatorward-drifting auroral arc, seen several degrees poleward of the onset region. The arc passes through the field-aligned beam of the EISCAT radar and is see...

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Variability of Currents in Front of the Venice Lagoon, Northern Ad...

By: A. Mazzoldi; M. Gačić; S. Cosoli

Description: Istituto Nazionale di Oceanografia e di Geofisica Sperimentale – OGS, Sgonico (Trieste), Italy. Time scales and modes of variability of the flow in the water column in the Northern Adriatic Sea for late summer 2002 are described based on current record from a single bottom-mounted ADCP in the shallow-water area in front of the Venice Lagoon.

The time averaged flow was directed 277° E (CCW), roughly aligned with the coastline, with typical ...

Bergamasco, A. and Gačić, M.: Baroclinic response of the Adriatic Sea to an episode of bora wind, J. Phys. Oceanogr., 26, 1354–1369, 1996.; Bjornsson, H. and Venegas, S. A.: A manual for EOF and SVD analyses of climate data. McGill University, CCGCR Report 97-1, Montreal, Quebec, 52 p., 1997.; Book, J. W., Signell, R. P., and Perkins, H.: Measurements of storm and non-storm circulation in the northern Adriatic: October 2002–April 2003, J. Geophys. Res., 112, C11S92, doi:...

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Turbulent Characteristics of a Semiarid Atmospheric Surface Layer ...

By: J. P. Frangi; D. C. Richard; S. Yahaya

Description: Laboratoire Environnement and Développement, CP 7071 Université Denis Diderot (Paris 7), 2 Place Jussieu, 75251 Paris Cedex 05, France. This paper deals with the characteristics of turbulent flow over two agricultural plots with various tillage treatments in a fallow, semiarid area (Central Aragon, Spain). The main dynamic characteristics of the Atmospheric Surface Layer (ASL) measured over the experimental site (friction velocity, roughness length, ...

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The Structure of High Altitude O+ Energization and Outflow: a Case...

By: H. Rème; R. Lundin; S. Joko; B. Klecker; J.-a. Sauvaud; M. B. Bavassano-cattaneo; C. W. Carlson; A. Korth; A. Balogh; H. Nilsson; L. M. Kistler; C. Carr; I. Dandouras

Description: Swedish Institute of Space Physics, Kiruna, Sweden. Multi-spacecraft observations from the CIS ion spectrometers on board the Cluster spacecraft have been used to study the structure of high-altitude oxygen ion energization and outflow. A case study taken from 12 April 2004 is discussed in more detail. In this case the spacecraft crossed the polar cap, mantle and high-altitude cusp region at altitudes between 4RE and 8RE

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Statistical Phase Propagation and Dispersion Analysis of Low Frequ...

By: K. H. Fornaçon; M. Fränz; Y. Narita; K.-h. Glassmeier; I. Dandouras; S. Schäfer

Description: Institut für Geophysik und extraterrestrische Physik, TU Braunschweig, Germany. We present the results of a statistical analysis of low-frequency fluctuations in the high latitude regions of the dayside magnetosheath using CLUSTER as a wave telescope. Magnetic field observations are used to determine wave propagation directions and wave numbers for selected frequencies. Using observations of the plasma flow velocity we correct for the Doppler shift, in ...

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Reconstruction of the Magnetopause and Low-latitude Boundary Layer...

By: G. Gustafsson; F. Darrouzet; M. Roth; H. Rème; J. De Keyser; A. Fazakerley; M. Dunlop; N. Cornilleau-wehrlin; P. Décréau

Description: Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180 Brussels, Belgium. Multi-spacecraft data from Cluster allow for a more detailed magnetopause and boundary layer structure determination than ever before. Reconstruction methods, in which the time variability observed during a pass is interpreted as being due to boundary motion and/or spatial structure, are particularly well suited for this task. Such methods rely on the availability of plasma and ...

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The Correlation of Longitudinal/Seasonal Variations of Evening Equ...

By: B. Ning; L. Liu; G. Li; J. Lei; Z. Ren; S.-y. Su

Description: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China. The evening pre-reversal vertical drift velocity enhancement (PRE) constitutes an important seeding mechanism for the generation of F region irregularities. Ion density and drift measurements from ROCSAT-1 and DMSP satellites are used to examine the correlation of longitudinal/seasonal (l/s) variations in the evening pre-reversal vertical drift velocity at the magnetic equ...

Aarons, J.: The role of the ring current in the generation and inhibition of equatorial F layer irregularities during magnetic storms, Radio Sci., 26, 1131–1149, 1991.; Abdu, M. A.: Outstanding problems in the equatorial ionosphere-thermosphere electrodynamics relevant to spread F, J. Atmos. Sol.-Terr. Phy., 63, 869–884, 2001.; Abdu, M. A., Bittencourt, J. A., and Batista, I. S.: Magnetic declination control of the equatorial F region dynamo electric field development an...

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Quantitative Modelling of the Closure of Meso-scale Parallel Curre...

By: O. Amm; M. Lester; G. K. Parks; J.-c. Cerisier; C. W. Carlson; A. Marchaudon

Description: Centre d’Etude des Environnements Terrestre et Planétaires, 4 avenue de Neptune, 94107 Saint-Maur-des-Fossés Cedex, France. On 12 January 2000, during a northward IMF period, two successive conjunctions occur between the CUTLASS SuperDARN radar pair and the two satellites Ørsted and FAST. This situation is used to describe and model the electrodynamic of a nightside meso-scale arc associated with a convection shear. Three field-aligned current sheets, one...

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On the Altitude Dependence of the Spectral Characteristics of Deca...

By: M. Lester; N. Sato; S. E. Milan; H. Takizawa

Description: Department of Physics and Astronomy, Leicester University, Leicester LE1 7RH, UK. Observations of E region backscatter by the Ice-land East SuperDARN HF radar from the 30 minute period 2330 to 2400 UT on 13 September 1999 are presented, along with simultaneous observations of auroral luminosity from two all-sky cameras. Interferometric techniques are employed to estimate the altitude of origin of each echo observed by the radar. Under investigation is a...

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The Role of Lateral Magnetic Reconnection in Solar Eruptive Events...

By: C. Jacobs; A. Bemporad; S. Poedts; A. Soenen

Description: Centre for Plasma-Astrophysics, K.U. Leuven, Belgium. On 10–11 December 2005 a slow CME occurred in between two coronal streamers in the Western Hemisphere. SOHO/MDI magnetograms show a multipolar magnetic configuration at the photosphere consisting of a complex of active regions located at the CME source and two bipoles at the base of the lateral coronal streamers. White light observations reveal that the expanding CME affects both of the lateral strea...

Amari, T., Luciani, J. F., Miki{ć}, Z., and Linker, J.: A twisted flux rope model for coronal mass ejections and two-ribbon flares, ApJ, 529, L49–L52, 2000.; Amari, T., Luciani, J. F., Aly, J. J., et al.: Coronal mass ejection: initiation, magnetic helicity, and flux ropes. I. Boundary motion-driven evolution, ApJ, 585, 1073–1086, 2003.; Amari, T., Aly, J. J., Miki{ć}, Z., and Linker, J.: Coronal Mass Ejection Initiation and Complex Topology Configurations in the Flux Ca...

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Barotropic Response in a Lake to Wind-forcing : Volume 19, Issue 3...

By: E. Bäuerle; Y. Wang; K. Hutter

Description: Institute of Mechanics, Darmstadt University of Technology, Hochschulstr. 1, D-64289 Darmstadt, Germany. We report results gained with a three-dimensional, semi-implicit, semi-spectral model of the shallow water equations on the rotating Earth that allowed one to compute the wind-induced motion in lakes. The barotropic response to unidirectional, uniform winds, Heaviside in time, is determined in a rectangular basin with constant depth, and in Lake Cons...

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Relationship Between Propagation Direction of Gravity Waves in Oh ...

By: K. Shiokawa; Y. Otsuka; S. Fukao; T. Ogawa; F. Onoma; S. Saito; M. Yamamoto

Description: Solar-Terrestrial Environment Laboratory, Nagoya University, Honohara 3-13, Toyokawa, Aichi 442-8507, Japan. We report simultaneous observations of atmospheric gravity waves (AGW) in OI (557.7nm) and OH airglow images and VHF radar backscatter from field-aligned irregularities (FAI) in the E-region during the SEEK-2 (Sporadic-E Experiment over Kyushu 2) campaign period from 29 July to 9 August 2002. An all-sky imager was operated at Ni...

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Long Term Ionospheric Electron Content Variations Over Delhi : Vol...

By: J. K. Gupta; L. Singh

Description: Radio and Atmospheric Sciences Division, National Physical Laboratory, Dr K S Krishnan Marg, New Delhi-110012, India. Ionospheric electron content (IEC) observed at Delhi (geographic co-ordinates: 28.63°N, 77.22°E; geomagnetic co-ordinates: 19.08°N, 148.91°E; dip Latitude 24.8°N), India, for the period 1975–80 and 1986–89 belonging to an ascending phase of solar activity during first halves of solar cycles 21 and 22 respectively have been used to study t...

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The Solar and Interplanetary Causes of the Recent Minimum in Geoma...

By: E. Echer; W. D. Gonzalez; B. T. Tsurutani

Description: Instituto Nacional de Pesquisas Espaciais, Sao Jose dos Campos, SP, Brazil. Minima in geomagnetic activity (MGA) at Earth at the ends of SC23 and SC22 have been identified. The two MGAs (called MGA23 and MGA22, respectively) were present in 2009 and 1997, delayed from the sunspot number minima in 2008 and 1996 by ~1/2–1 years. Part of the solar and interplanetary causes of the MGAs were exceptionally low solar (and thus low interplanetary) magnetic fiel...

Echer, E., Gonzalez, W. D., Guarnieri, F. L., Dal Lago, A., and Vieira, L. E. A.: Introduction to space weather, Adv. Space Res., 35, 855–865, 2005.; Akasofu, S.-I.: Energy coupling between the solar wind and the magnetosphere, Space Sci. Rev., 28, 121–190, 1981.; Balogh, A., Bothmer, V., Crooker, N. U., Forsyth, R. J., Gloeckler, G., Hewish, A., Hilchenbach, M., Kallenbach, R., Klecker, B., Linker, J. A., Lucek, E., Mann, G., Marsch, E., Posner, A., Richardson, I. G., S...

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On the Possibility of Using an Electromagnetic Ionosphere in Globa...

By: P. Janhunen

Description: Finnish Meteorological Institute, Geophysical Research, P.O. Box 503, FIN-00101 Helsinki, Finland. Global magnetohydrodynamic (MHD) simulations of the Earth's magnetosphere must be coupled with a dynamical ionospheric module in order to give realistic results. The usual approach is to compute the field-aligned current (FAC) from the magnetospheric MHD variables at the ionospheric boundary. The ionospheric potential is solved from an elliptic equation us...

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Pulsed Energy Storage Antennas for Ionospheric Modification : Volu...

By: E. Nichols; W. Beam; J. Chen; R. F. Wuerker

Description: UCLA Plasma Physics Lab., Los Angeles, CA 90095, USA. Interesting, new, very high peak-power pulsed radio frequency (RF) antennas have been assembled at the HIPAS Observatory (Alaska, USA) and also at the University of California at Los Angeles (UCLA, USA); namely, a pair of quarter wavelength (Λ/4) long cylindrical conductors separated by a high voltage spark gap. Such a combination can radiate multi-megawatt RF pulses whenever the spark gap fires. The...

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Injection and Acceleration of H+ and He2+ at Earth's Bow Shock : V...

By: H. Kucharek; K.-h. Trattner; M. Scholer

Description: Max-Planck-Institut für extraterrestrische Physik, 85740 Garching, Germany. We have performed a number of one-dimensional hybrid simulations (particle ions, massless electron fluid) of quasi-parallel collisionless shocks in order to investigate the injection and subsequent acceleration of part of the solar wind ions at the Earth's bow shock. The shocks propagate into a medium containing magnetic fluctuations, which are initially superimposed on the back...

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A Statistical and Event Study of Magnetotail Dipolarization Fronts...

By: M. Volwerk; R. Nakamura; M. Heyn; D. Schmid; W. Baumjohann

Description: Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria. A study of dipolarization fronts of the Earth's magnetotail has been performed using seven years (2001–2007) of Cluster data. Events both with and without high-speed earthward flows are included. A superposed epoch analysis of the data shows that the dipolarization is preceeded by a decrease of Bz before the increase. The duration of the dipolarization tends to ...

Angelopoulos, V.: The THEMIS mission, Space Sci. Rev., 141, 5–34, 2002.; Angelopoulos, V., Baumjohann, W., Kennel, C. F., Coroniti, R. V., Kivelson, M. G., Pellat, R., Walker, R. J., L{ü}hr, H., and Paschmann, G.: Bursty bulk flows in the inner central plasma sheet, J. Geophys. Res., 97, 4027–4039, 1992.; Baumjohann, W., Paschmann, G., and L{ü}hr, H.: Characteristics of high-speed flows in the plasma sheet, J. Geophys. Res., 95, 3801–3809, 1990.; Angelopoulos, V., Kennel...

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