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AP-index Solar Wind Driving Function and Its Semiannual Variations...

By: M. Y. Zakharov; A. A. Petrukovich

Description: Space Research Institute, 84/32 Profsoyuznaya st., Moscow, 117997, Russia. Semiannual variation of geomagnetic activity and ap-index in particular is supposed to consist of heliospheric factor (axial hypothesis and Russell-McPherron effect) and magnetospheric/ionospheric factor (equinoctical hypothesis). In our investigation we express ap-index as a magnetospheric response function to solar wind and IMF input. Seaso...

Bohlin, J. D.: Extreme-ultraviolet observations of coronal holes, Sol. Phys., 51, 377–398, 1977.; Boyle, C. B., Reiff, P. H., and Hairston, M. R.: Empirical polar cap potentials, J. Geophys. Res., 102, 111–125, 1997.; Cliver, E. W., Kamide, Y., and Ling, A. G.: Mountains versus valleys: Semiannual variation of geomagnetic activity, J. Geophys. Res., 105, 2413–2424, 2000.; Cliver, E. W., Kamide, Y., and Ling, A. G.: The semiannual variation of geomagnetic activity: phases...

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Spectral Characteristics of Spring Arctic Mesosphere Dynamics : Vo...

By: C. E. Meek; A. H. Manson; C. M. Hall

Description: The Auroral Observatory, Department of Physics, University of Tromsø, 9037 Tromsø, Norway
e-mail chris.hall@phys.uit.no. The spring of 1997 has represented a stable period of operation for the joint University of Tromsø / University of Saskatchewan MF radar, being between refurbishment and upgrades. We examine the horizontal winds from the February to June inclusive and also include estimates of energy dissipation rates derived from signal fading time...

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Earth Conductivity Structures and Their Effects on Geomagnetic Ind...

By: D. H. Boteler; C. Samson; L. Trichtchenko; P. Larocca; P. A. Fernberg

Description: Dept. of Earth Sciences, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada. Anomalous, large pipe-to-soil potentials (PSP) have been observed along a natural gas pipeline in eastern Ontario, Canada, where there is a major geological contact between the highly resistive rocks of the Precambrian Shield to the west and the more conductive Paleozoic sediments to the east. This study tested the hypothesis that large variations of PSP are...

Belanger, J. R.: Urban geology of Canada's National Capital area, in: Urban Geology of Canadian Cities, edited by: Karrow, P. and White, O., Geological Association of Canada Special Paper, 42, 365–384, 1998.; Beamish, D., Clark, T. D. G., Clarke, E., and Thomson, A. W. P.: Geomagnetically induced currents in the UK: geomagnetic variations and surface electric fields, J. Atmos. Solar Terr., 64, 1779–1792, 2002.; Bianchetti, R. L.: Survey method and evaluation techniques, ...

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Locating the Solar Source of 13 April 2006 Magnetic Cloud : Volume...

By: L. K. Harra; C. J. Owen; L. M. Green; A. P. Walsh; P. Démoulin; K. Steed; S. Dasso; L. Van Driel-gesztelyi

Description: Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK. Using Advanced Composition Explorer (ACE) in situ data we identify and describe an interplanetary magnetic cloud (MC) observed near Earth on 13 April 2006. We also use multi-instrument and multi-wavelength observations from the Solar and Heliospheric Observatory (SOHO), the Transition Region and Coronal Explorer (TRACE) and ground-based solar obse...

Baker, D., van Driel-Gesztelyi, L., and Attrill, G. D. R.: Evidence for interchange reconnection between a coronal hole and an adjacent emerging flux region, Astronomische Nachrichten, 328, 773–776, 2007.; Berger, M. A.: Rigorous new limits on magnetic helicity dissipation in the solar corona, Geophys. Astrophys. Fluid Dynam., 30, 79–104, 1984.; Bothmer, V. and Schwenn, R.: Eruptive prominences as sources of magnetic clouds in the solar wind, Space Sci. Rev., 70, 215–220...

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Seasonal Variability and Geostrophic Circulation in the Eastern Me...

By: C. Tziavos; G. Papadoniou; A. Lascaratos; V. Zervakis

Description: National Center for Marine Research, Aghios Kosmas, GR-16 604 Hellenikon, Greece. The evolution of the upper thermocline on a section across the eastern Mediterranean was recorded bi-weekly through a series of XBT transects from Piraeus, Greece to Alexandria, Egypt, extending from October 1999 to October 2000 on board Voluntary Observing Ships in the framework of the Mediterranean Forecasting System Pilot Project. The data acquired provided valuabl...

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Faraday Polarization Fluctuations and Their Dependence on Post Sun...

By: R. S. Dabas; Lakha Singh; J. K. Gupta

Description: Radio and Atmospheric Sciences Division, National Physical Laboratory, Dr K. S. Krishnan Marg, New Delhi 110012, India. VHF Faraday rotation (FR) and amplitude scintillation data recorded simultaneously during May 1978–December 1980 at Delhi (28.63° N, 77.22° E; Dip 42.44° N) is analyzed in order to study the Faraday polarization fluctuations (FPFs) and their dependence on the occurrence of post sunset secondary maximum (PSSM) and amplitude scintil...

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On the Origin of Pre-reversal Enhancement of the Zonal Equatorial ...

By: G. Crowley; R. R. Ilma; M. C. Kelley

Description: School of Electrical and Computer Engineering, Cornell University, Ithaca, NY, USA. In November 2004, a large and variable interplanetary electric field (IEF) was felt in the reference frame of the Earth. This electric field penetrated to the magnetic equator and, when the Jicamarca Radio Observatory (JRO) was in the dusk sector, resulted in a reversal of the normal zonal component of the field. In turn, this caused a counter-electrojet (CEJ), a westward...

Eccles, V.: Modeling investigation of the evening pre-reversal enhancement of the zonal electric field in the equatorial ionosphere, J. Geophys. Res., 103, 26709–26719, 1998.; Farley, D. T., Bonelli, E., Fejer, B. G., and Larsen, M. F.: The prereversal enhancement of the zonal electric field in the equatorial ionosphere, J. Geophys. Res., 91, 13723–13728, 1986.; Haerendel, G. and Eccles, J. V.: The role of the equatorial electrojet in the evening ionosphere, J. Geophys. ...

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A Solar Cycle of Spacecraft Anomalies Due to Internal Charging : V...

By: K. A. Ryden; G. L. Wrenn; D. J. Rodgers

Description: QinetiQ, A8, Cody Technology Park, Farnborough, Hampshire, GU14 0LX, UK. It is important to appreciate how the morphology of internal charging of spacecraft systems, due to penetrating electrons, differs from that of the more common surface charging, due to electrons with lower energy. A specific and recurrent anomaly on a geostationary communication satellite has been tracked for ten years so that solar cycle and seasonal dependencies can be clear...

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Magnetospheric Mapping of the Dayside Uv Auroral Oval at Saturn Us...

By: S. W. H. Cowley; M. S. Blokhina; J. D. Nichols; E. S. Belenkaya; V. V. Kalegaev

Description: Institute of Nuclear Physics, Moscow State University, Vorob'evy Gory, 119992 Moscow, Russia. We determine the field-aligned mapping of Saturn's auroras into the magnetosphere by combining UV images of the southern dayside oval obtained by the Hubble Space Telescope (HST) with a global model of the magnetospheric magnetic field. The model is tailored to simulate prevailing conditions in the interplanetary medium, corresponding to high solar wind dynamic...

Alexeev, I. I.: The magnetospheres of Mercury, Earth, and the giant planets Jupiter and Saturn, Moscow Univ. Phys. Bull., 65, 300–306, 2010.; Alexeev, I. I. and Belenkaya, E. S.: Electric field in an open model of the magnetosphere, Geomagn. Aeron., 23, 57–61, 1983.; Alexeev, I. I. and Belenkaya, E. S.: Modeling of the Jovian Magnetosphere, Ann. Geophys., 23, 809–826, doi:10.5194/angeo-23-809-2005, 2005.; Alexeev, I...

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Stratospheric Ozone Depletion During the 1995–1996 Arctic Winter: ...

By: F. Baier; B. C. Krüger; J. Hendricks; A. Ebel; G. Günther

Description: Institut für Geophysik und Meteorologie, Universität zu Köln, EURAD, Aachener Str. 201-209, D-50931 Köln, Germany. The sensitivity of modelled ozone depletion in the winter Arctic stratosphere to different assumptions of prevalent PSC types and PSC formation mechanisms is investigated. Three-dimensional simulations of the winter 1995/96 are performed with the COlogne Model of the Middle Atmosphere (COMMA) by applying different PSC microphysical sch...

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Enhanced E-layer Ionization in the Auroral Zones Observed by Radio...

By: N. Jakowski; C. Mayer

Description: German Aerospace Center, Institute of Communications and Navigation, Kalkhorstweg 53, 17235 Neustrelitz, Germany. Particle precipitation of magnetospheric origin causes additional ionization in the auroral zone at E-layer heights. During night-time, in particular at winter-night, the E-layer ionization may dominate over the F2-layer ionization level. To study the geophysical conditions and characteristics of the related ionospheric processes in mor...

Feldstein, Y I.: On Morphology and Auroral and Magnetic Disturbances at High Latitudes, Geomagn Aeron., 3, 227–239, 1963.; Feldstein, Y I., Holzworth, R H., and Meng, C.-I.: Feldstein/Holzworth/Meng Auroral boundary model, http://nssdcftp.gsfc.nasa.gov/models/ionospheric/auroral_oval/feldstein_holzworth, last access November 2008.; Hajj, G A. and Romans, L J.: Ionospheric electron density profiles obtained with the Global Positioning System: Results from the GPS/MET expe...

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The Atmospheric Implications of Radiation Belt Remediation : Volum...

By: P. T. Verronen; Th. Ulich; C. J. Rodger; E. Turunen; N. R. Thomson; M. A. Clilverd

Description: Department of Physics, University of Otago, Dunedin, New Zealand. High altitude nuclear explosions (HANEs) and geomagnetic storms can produce large scale injections of relativistic particles into the inner radiation belts. It is recognised that these large increases in >1 MeV trapped electron fluxes can shorten the operational lifetime of low Earth orbiting satellites, threatening a large, valuable population. Therefore, studies are being undertaken to ...

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On the Modeling of Planetary Plasma Environments by a Fully Kineti...

By: E. Kallio; V. Pohjola

Description: Finnish Meteorological Institute, Helsinki, Finland. We have developed a fully kinetic electromagnetic model to study instabilities and waves in planetary plasma environments. In the particle-in-a-cell (PIC) model both ions and electrons are modeled as particles. An important feature of the developed global kinetic model, called HYB-em, compared to other electromagnetic codes is that it is built up on an earlier quasi-neutral hybrid simulation platform...

Alonso, M. and Finn, E. J.: Fundamental University Physics II: Fluids and Waves, Addison-Wesley publishing company, 1980.; Blomberg, L. G., Matsumoto, H., Bougeret, J.-L., Kojima, H., Yagitani, S., Cumnock, J. A., Eriksson, A. I., Marklund, G. T., Wahlund, J.-E., Bylander, L., Åhlén, L., Holtet, J. A., Ishisaka, K., Kallio, E., Kasabai, Y., Matsuoka, A., Moncuquet, M., Mursula, K., Omura, Y., and Trotignon, J. G.: MEFISTO – An electric field instrument for BepiColombo/MM...

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Climatology of Zonal Wind and Large-scale Fac with Respect to the ...

By: H. Lühr; G. N. Kervalishvili

Description: Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany. We investigate the relationship of the thermospheric density anomaly (Ρrel) with the neutral zonal wind velocity (Uzonal), large-scale field-aligned current (FAC), small-scale FAC, and electron temperature (Te) using the superposed epoch analysis (SEA) method in the cusp region. The dependence of the...

Aruliah, A. L., Farmer, A. D., Rees, D., and Brändström, U.: The seasonal behaviour of high-latitude thermospheric winds and ion velocities observed over one solar cycle, J. Geophys. Res., 101, 15701–15711, doi:10.1029/96JA00360, 1996.; Bruinsma, S., Forbes, J. M., Nerem, R. S., and Zhang, X.: Thermosphere density response to the 20–21 November 2003 solar and geomagnetic storm from CHAMP and GRACE accelerometer data, J. Geo...

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Equatorial Scintillations in Relation to the Development of Ioniza...

By: A. Paul; A. Dasgupta; S. Ray

Description: S. K. Mitra Center for Research in Space Enviornment, University of Calcutta, Calcutta, India. The irregularities in the electron density distribution of the ionosphere over the equatorial region frequently disrupt space-based communication and navigation links by causing severe amplitude and phase scintillations of signals. Development of a specification and forecast system for scintillations is needed in view of the increased reliance on space-based c...

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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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Retrieval of Dust Aerosols During Night: Improved Assessment of Lo...

By: J. Srinivasan; S. Deepshikha

Description: Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore-560012, India. Several investigators in the past have used the radiance depression (with respect to clear-sky infrared radiance), resulting from the presence of mineral dust aerosols in the atmosphere, as an index of dust aerosol load in the atmosphere during local noon. Here, we have used a modified approach to retrieve dust index during night since assessment of diurna...

Chandra, S., Satheesh, S. K., and Srinivasan, J.: Can the state of mixing of black carbon aerosols explain the mystery of excess atmospheric absorption?, Geophys. Res. Lett., 31, L19109, doi:10.1029/2004GL020662, 2004.; Coackley, J. A. and Bretherton, F. P.: Cloud cover from high resolution scanner data: method and preliminary results, J. Geophys. Res., 87, 4917–4932, 1982.; Deepshikha, S., Satheesh, S. K., and Srinivasan, J.: Regional Distribution of Absorbing Efficienc...

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