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Optical, Radar, and Magnetic Observations of Magnetosheath Plasma ...

By: M. Uspensky; T. K. Yeoman; A. Kozlovsky; D. M. Wright; V. Safargaleev; A. Kotikov; H. Nilsson; T. Sergienko; T. Turunen

Description: Polar Geophysical Institute, Apatity, 184200, Russia. We present a multi-instrument study of the ionospheric response to a northward turning of the IMF. The observations were made in the near-noon (11:00 MLT) sector on Svalbard (at 75° MLAT). The data set includes auroral observations, ionospheric flows obtained from the EISCAT and CUTLASS radars, the spectral width of the HF radar backscatter, particle precipitation and plasma flow data from the DMSP F...

Anderson, B. J. and Fuselier, S. A.: Magnetic pulsations from 0.1 to 4.0 Hz and associated plasma properties in the Earth's subsolar magnetosheath and plasma depletion layer, J. Geophys. Res., 98, 1461–1479, 1993.; André, R., Pinnock, M., and Rodger, A. S.: Identification of the low-latitude cusp by Super Dual Auroral Radar Network radars: A physical explanation for the empirically derived signatures, J. Geophys. Res., 105, 27 081–27 094, 2000.; Baker,~K B., Dudeney,~J R...

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Refilling Process in the Plasmasphere: a 3-d Statistical Character...

By: J. G. Trotignon; P. M. E. Décréau; X. Vallières; F. Darrouzet; J.-l. Rauch; S. Kougblénou; G. Lointier

Description: Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, UMR 7328 CNRS/University of Orléans, 3A avenue de la recherche Scientifique, 45071 Orléans cedex 2, France. The Cluster mission offers an excellent opportunity to investigate the evolution of the plasma population in a large part of the inner magnetosphere, explored near its orbit's perigee, over a complete solar cycle. The WHISPER sounder, on board each satellite of the mission, is part...

Andr{é}, N. and Lemaire, J. F.: Convective instabilities in the plasmasphere, J. Atmos. Solar-Terr. Phys., 68, 213–227, 2006.; Balogh, A., Dunlop, M. W., Cowley, S. W. H., Southwood, D. J., Thomlinson, J. G., Glassmeier, K. H., Musmann, G., Luhr, H., Buchert, S., Acuna, M. H., Fairfield, D. H., Slavin, J. A., Riedler, W., Schwingenschuh, K., and Kivelson, M. G.: The Cluster Magnetic Field Investigation, Space Sci. Rev., 79, 65–91,

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Global Change Induced Trends in Ion Composition of the Troposphere...

By: G. Beig

Description: Indian Institute of tropical Meteorology, Pashan, Pune-411008, India. In this paper a brief overview of the changes in atmospheric ion compositions driven by the human-induced changes in related neutral species, and temperature from the troposphere to lower thermosphere has been made. It is found that ionic compositions undergo significant variations. The variations calculated for the double-CO2 scenario are both long-term and permanent in na...

Akmaev, R. A. and Fomichev, V. I.: Cooling of the mesosphere and lower thermosphere due to doubling of CO2, Ann. Geophys., 16, 1501–1512, 1998.; Arijs, E. and Brasseur, G.: Acetonitrile in the stratosphere and implications for positive ion composition, J. Geophys. Res., 91, 4003–4016, 1986.; Beig, G.: The Relative Importance of Solar Activity and Anthropogenic Influences on the Ion Composition, Temperature and Associated Neutrals of the Middle Atmosphere, J. G...

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High-latitude Plasma Convection from Cluster Edi Measurements: Met...

By: M. Förster; G. Paschmann; J. M. Quinn; C. E. McIlwain; S. E. Haaland; H. Vaith; R. B. Torbert; C. A. Kletzing; P. A. Puhl-quinn

Description: Max-Planck-Institut für extraterrestrische Physik, Garching, Germany. We have used vector measurements of the electron drift velocity made by the Electron Drift Instrument (EDI) on Cluster between February 2001 and March 2006 to derive statistical maps of the high-latitude plasma convection. The EDI measurements, obtained at geocentric distances between ~4 and ~20 RE over both hemispheres, are mapped into the polar ionosphere, and sorte...

Atkinson, G. and Hutchison, D.: Effect of the day night ionospheric conductivity gradient on polar cap convective flow, J. Geophys. Res., 83, 725–729, 1978.; Axford, W I. and Hines, C O.: A unifying theory of high-latitude geophysical phenomena and geomagnetic storms, Can. J. Phys., 39, 1433–1464, 1961.; Baker, J B H., Greenwald, R A., Ruohoniemi, J M., Förster, M., Paschmann, G., Donovan, E F., Tsyganenko, N A., Quinn, J M., and Balogh, A.: Conjugate comparison of Super...

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A New Approach to the Derivation of Dynamic Information from Ionos...

By: W. Wan; B. Ning; J. Lei; X. Luan; L. Liu

Description: Wuhan Ionospheric Observatory, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan, 430071, P. R. China. A new approach is developed to derive dynamic information near the peak of the ionospheric F-layer from ionosonde measurements. This approach avoids deducing equivalent winds from the displacement of the observed peak height from a no-wind equilibrium height, so it need not determine the no-wind equilibrium height ...

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The Correlation Between Solar and Geomagnetic Activity – Part 3: a...

By: Z. L. Du

Description: Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China. An integral response model is proposed to describe the relationship between geomagnetic activity (aa index) and solar activity (represented by sunspot number Rz): The aa at a given time t is the integral of Rz at past times (t'≤t) multiplied by an exponential ...

Bachmann, K. T. and White, O. R.: Observations of hysteresis in solar cycle variations among seven solar activity indicators, Sol. Phys., 150, 347–357, 1994.; Bame, S. J., Asbridge, J. R., Feldman, W. C., and Gosling, J. T.: Solar cycle evolution of high-speed solar wind streams, Astrophys. J., 207, 977–980, 1976.; Borello-Filisetti, O., Mussino, V., Parisi, M., and Storini, M.: Long-term variations in the geomagnetic activity level. I – A connection with solar activity,...

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Studies of Gravity Wave Propagation in the Mesosphere Observed by ...

By: T. Nakamura; S. Fukao; F. S. Kuo; H. Y. Lue

Description: Department of Physics, Fu Jen University, Hsin Chuang, Taiwan. Mesospheric data were analyzed by a composite method combining phase and group velocity tracing technique and the spectra method of Stokes parameter analysis to obtain the propagation parameters of atmospheric gravity waves (AGW) in the height ranges between 63.6 and 99.3 km, observed using the MU radar at Shigaraki in Japan in the months of November and July in the years 1986, 1988 and 1989...

Ebel, A., Manson, A. H., and Meek, C. E.: Short period fluctuations of the horizontal wind measured in the upper middle atmosphere and possible relationships to internal gravity waves, J. Atmos. Terr. Phys., 49, 385–401, 1987.; Eckermann, S. D. and Vincent, R. A.: Falling sphere observations of atmospheric gravity wave motions in the upper stratosphere over Australia, Pure Appl. Geophys., 130, 509–532, 1989.; Fritts, D. C. and Alexander, M. J.: Gravity wave dynamics and ...

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Factors Determining Spectral Width of Hf Echoes from High Latitude...

By: C. L. Waters; F. W. Menk; P. V. Ponomarenko

Description: University of Newcastle, Callaghan, New South Wales, Australia. Spectral width is one of the standard data types produced by the Super Dual Auroral Radar Network (SuperDARN). A pronounced latitudinal gradient in spectral width has been reported in the literature and is used as an empirical proxy for the ionospheric footprint of the open-closed field-line boundary. In this work we investigated the daytime radar echo properties near the spectral width bou...

André, R., Pinnock, M., Villain, J P., and Hanuise, C.: On the factor conditioning the Doppler spectral width determined from SuperDARN HF radars, Int. J. Geomagn. Aeron., 2, 77–86, 2000.; Baker, K B. and Wing, S.: A new magnetic coordinate system for conjugate studies at high latitudes, J. Geophys. Res., 94, 9139–9144, 1989.; Baker, K B., Greenwald, R A., Walker, A. D M., Bythrow, P F., Zanetti, L J., Potemra, T A., Hardy, D., Rich, F J., and Rino, C L.: A case study of...

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Coupled Rotational Dynamics of Jupiter's Thermosphere and Magnetos...

By: C. G. A. Smith; A. D. Aylward

Description: Atmospheric Physics Laboratory, Department of Physics and Astronomy, University College, London, UK. We describe an axisymmetric model of the coupled rotational dynamics of the thermosphere and magnetosphere of Jupiter that incorporates self-consistent physical descriptions of angular momentum transfer in both systems. The thermospheric component of the model is a numerical general circulation model. The middle magnetosphere is described by a simple phys...

Bougher, S W., Waite, J H., Majeed, T., and Gladstone, G R.: Jupiter Thermospheric General Circulation Model (JTGCM): Global structure and dynamics driven by auroral and Joule heating, J. Geophys. Res., 110, 4008, doi:10.1029/2003JE002230, 2005.; Codrescu, M V., Fuller-Rowell, T J., and Foster, J C.: On the importance of E-field variability for Joule heating in the high-latitude thermosphere, \grl, 22, 2393–2396, 1995.; Connerney, J E P., Acuña, M H., Ness, N F., and Sat...

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Seasonal Variations in the Incidence of Auroral Radio Absorption E...

By: J. K. Hargreaves

Description: Dept. of Communication Systems, University of Lancaster, Bailrigg, Lancaster LA1 4WA, UK. A statistical analysis has been made of the incidence of auroral radio absorption events at South Pole, and of its dependence on basic geophysical parameters such as season, time of day, and magnetic activity level. It is found that at low and moderate levels of activity the incidence of events in the winter season is at least twice that in the summer. However, at h...

Barish, F. D. and Roederer, J. G.: Influence of a magnetospheric cavity model field on geomagnetic conjugacy of high latitude stations, University of Denver report, July 1969.; Behannon, K. W. and Ness, N. F.: Magnetic storms in the earth's magnetic tail, J. Geophys. Res., 71, 2327–2351, 1966.; Hargreaves, J. K. and Chivers, H. J. A.: A study of auroral absorption events at the South Pole. 2. Conjugate properties, J. Geophys. Res., 70, 1093–1102, 1965.; Gillmor, C. S. an...

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Reconnection in a Slow Coronal Mass Ejection : Volume 26, Issue 10...

By: M. Romoli; F. Landini; A. Bemporad; G. Poletto

Description: INAF – Arcetri Astrophysical Observatory, Firenze, Italy. This paper aims at studying reconnection occurring in the aftermath of the 28 May 2004, CME, first imaged by the LASCO (Large Angle and Spectrometric Coronagraph) C2 at 11:06 UT. The CME was observed in White Light and UV radiation: images acquired by the LASCO C2 and C3 coronagraphs and spectra acquired by UVCS (Ultraviolet Coronagraph Spectrometer) allowed us to identify the level at which fie...

Aurass, H., Vršnak, B., and Mann, G.: Shock-excited radio burst from reconnection outflow jet?, Astron. Astrophys., 384, 273–281, 2002.; Antiochos, S. K., DeVore, C. R., and Klimchuck, J. A.: A model for Solar Coronal Mass Ejections, Astrophys. J., 510, 485–493, 1999.; Bárta, M., Vršnak, B., and Karlick\'y, M.: Dynamics of plasmoids formed by the current sheet tearing, Astron. Astrophys., 477, 649–655, 2008.; Bemporad, A., Poletto, G., Suess, S. T., et al.: Current Sheet...

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D- and E-region Effects in the Auroral Zone During a Moderately Ac...

By: B. J. I. Bromage; M. J. Birch; J. K. Hargreaves

Description: Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK. The effects of energetic electron precipitation into the auroral region at a time of enhanced solar wind have been investigated during a continuous period of 24 h, using the European Incoherent Scatter (EISCAT) radar, an imaging riometer, and particle measurements on an orbiting satellite. The relative effects in the E region (120 km) and D region (90 km) are found to vary d...

Akasofu, S.-I.: The development of the auroral substorm, Planet. Space Sci., 12, 273–282, 1964.; Bogott, F. H. and Mozer, F. S.: Drifting energetic particle bunches observed on ATS 5, J. Geophys. Res., 79, 1825–1830, 1974.; Browne, S., Hargreaves, J. K., and Honory, B.: An imaging riometer for ionospheric studies, Electronics and Communication Engineering Journal, 7, 209–217, 1995.; Burns, C. J., Howarth, W. G., and Hargreaves, J. K.: High-resolution incoherent scatter r...

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The Sao and Kelvin Waves in the Eurogrips Gcms and the Uk Met. Off...

By: A. A. Scaife; S. Pawson; D. M. Li; U. Langematz; M. Amodei; W. Lahoz; P. Simon

Description: CNRM, Météo France, Toulouse, France. We compare the tropical oscillations and planetary scale Kelvin waves in four troposphere-stratosphere climate models and the assimilated dataset produced by the United Kingdom Meteorological Office (UKMO). The comparison has been made in the GRIPS framework "GCM-Reality Intercomparison Project for SPARC", where SPARC is Stratospheric Processes and their Role in Climate, a project of the World Climate Research Prog...

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Observations of Time Dependence and Aspect Sensitivity of Regions ...

By: R. S. Dhillon; T. R. Robinson

Description: Department of Physics and Astronomy, University or Leicester, University Road Leicester, LE1 7RH, UK. The EISCAT incoherent radar system, which is collocated with the EISCAT heating facility, is used to diagnose the ionosphere while heating experiments are conducted. In late September 2002, an experiment was performed in which the heater transmitted a 2-min-on/2-min-off cycle while its pointing direction was kept fixed and the UHF beam was cycled throug...

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Diurnal Variation of Short-period (20–120 Min) Gravity Waves in th...

By: Y. Shibagaki; T. Tsuda; N. Venkateswara Rao

Description: Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan. We study short period gravity waves (20–120 min) in the equatorial Mesosphere and Lower Thermosphere (MLT) using a Medium Frequency (MF) radar at Pameungpeuk (7.4° S, 107.4° E), Indonesia. In particular, we study local time and seasonal variation of the gravity wave variance and its relation to tropical convection. The gravity wave variance at 88 km enhances between 20:00 LT ...

Alexander, M. J.: A simulated spectrum of convectively generated gravity waves: Propagation from the tropopause to the mesopause and effects on the middle atmosphere, J. Geophys. Res., 101(D1), 1571–1588, 1996.; Alexander, S. P., Tsuda, T., Kawatani, Y., and Takahashi, M.: Global distribution of atmospheric waves in the equatorial upper troposphere and lower stratosphere: COSMIC observations of wave mean flow interactions, J. Geophys. Res., 113, D24115,

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On the Location of Dayside Magnetic Reconnection During an Interva...

By: J. A. Davies; S. E. Milan; A. Balogh; D. M. Wright; A. N. Fazakerley; A. Marchaudon; H. Rème; J. A. Wild; M. W. Dunlop; C. M. Carr

Description: Dept. of Communication Systems, Lancaster University, Lancaster, LA1 4WA, UK. We present space- and ground-based observations of the signatures of magnetic reconnection during an interval of duskward-oriented interplanetary magnetic field on 25 March 2004. In situ field and plasma measurements are drawn from the Double Star and Cluster satellites during traversals of the pre-noon sector dayside magnetopause at low and high latitudes, respectively. These ...

Balogh, A., Carr, C M., Acuna, M H., Dunlop, M W., Beek, T J., Brown, P., Fornacon, K.-H., Georgescu, E., Glassmeier, K.-H., Harris, J., Musmann, G., Oddy, T., and Schwingenschuh, K.: The Cluster Magnetic Field Investigation: overview of in-flight performance and initial results, Ann. Geophys., 19, 1207–1217, 2001.; Carr, C., Brown, P., Zhang, T L., Gloag, J., Horbury, T., Lucek, E., Magnes, W., O'Brien, H., Oddy, T., Auster, U., Austin, P., Aydogar, O., Balogh, A., Baum...

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Fluid and Particle Signatures of Dayside Reconnection : Volume 19,...

By: N. Sckopke; G. Paschmann; R. A. Treumann; T. M. Bauer; W. Baumjohann; T.-d. Phan

Description: Max-Planck-Institut für extraterrestrische Physik, Garching, Germany. Using measurements of the AMPTE/IRM spacecraft, we study reconnection signatures at the dayside magnetopause. If the magnetopause is open, it should have the properties of a rotational discontinuity. Applying the fluid concept of a rotational discontinuity, we check for the existence of a de Hoffmann-Teller frame and the tangential stress balance (Walén relation). For 13 out of 4...

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Large Enhancements in Low Latitude Total Electron Content During 1...

By: R. S. Dabas; S. Alex; S. Sharma; R. Pandey; N. Dashora

Description: National Atmospheric Research Laboratory, Gadanki, Department of Space, Government of India – 517 112, India. Results pertaining to the response of the equatorial and low latitude ionosphere to a major geomagnetic storm that occurred on 15 May 2005 are presented. These results are also the first from the Indian zone in terms of (i) GPS derived total electron content (TEC) variations following the storm (ii) Local low latitude electrodynamics response to ...

Balthazor, R. L. and Moffett, R. J.: A study of atmospheric gravity waves and travelling ionospheric disturbances at equatorial latitudes, Ann. Geophys., 15, 1048–1056, 1997. %; Basu, Su., Basu, S., Valladares, C. E., Yeh, H.-C., Su, S.-Y., Mackenzie, E., Sultan, P. J., Aarons, J., Rach, F. J., Doherty, P., Groves, K. M., and Bullett, T. W.: Ionosphearic effects of major magnetic storms during the interational space period of september and october 1999: GPS obervations, ...

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Corrigendum to the Pc Index: Review of Methods Published in Ann. G...

By: M. Menvielle; H. McCreadie

Description: University of Kwa Zulu-Natal, Durban, South Africa. No abstract available.

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Investigation of the Outer and Inner Low-latitude Boundary Layers ...

By: T. M. Bauer; R. A. Treumann; W. Baumjohann

Description: Max-Planck-Institut für extraterrestrische Physik, Garching, Germany. We analyze 22 AMPTE/IRM crossings of the day-side low-latitude boundary layer for which a dense outer part can be distinguished from a dilute inner part. Whereas the plasma in the outer boundary layer (OBL) is dominated by solar wind particles, the partial densities of solar wind and magnetospheric particles are comparable in the inner boundary layer (IBL). For 11 events we find ...

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