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Planetary Wave Seasonality from Meteor Wind Measurements at 7.4° S...

By: P. P. Batista; B. R. Clemesha; L. M. Lima; L. R. Araújo; H. Takahashi

Description: PPGCTA-CCT, Universidade Estadual da ParaÍba, UEPB, 58.109-790, Campina Grande – PB, Brazil. In this study we have used wind observation data from the mesosphere and lower thermosphere (MLT) region, obtained from meteor radar measurements in São João do Cariri (7.4° S, 36.5° W) from July 2004 to December 2008 and in Cachoeira Paulista (22.7° S, 45.0° W) from January 2002 to July 2006 and from September 2007 to November 2008. From the spectral analysis i...

Batista, P. P., Clemesha, B. R., Tokumoto, A. S., and Lima, L. M.: Structure of the mean winds and tides in the meteor region over Cachoeira Paulista, Brazil (22.7° S, 45° W) and its comparison with models, J. Atmos. Terr. Phys., 66, 623–636, doi:10.1016/j.jastp.2004.01.014, 2004.; Charney, J. G. and Drazin, P. G.: Propagation of planetary-scale disturbances from the lower into the upper atmosphere, J. Geophys. Re...

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Inertial-range Spectrum of Whistler Turbulence : Volume 28, Issue ...

By: S. P. Gary; Y. Narita

Description: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany. We develop a theoretical model of an inertial-range energy spectrum for homogeneous whistler turbulence. The theory is a generalization of the Iroshnikov-Kraichnan concept of the inertial-range magnetohydrodynamic turbulence. In the model the dispersion relation is used to derive scaling laws for whistler waves at high...

Kraichnan, R. H.: Inertial-range spectrum of hydromagnetic turbulence, Phys. Fluids, 8, 1385–1387, 1965.; Iroshnikov, P. S.: Turbulence on a conducting fluid in a strong magnetic field, Sov. Astron., 7, 566–571, 1964.; Alexandrova, O., Saur, J., Lacombe, C., Mangeney, A., Mitchell, J., Schwartz, S. J., and Robert, P.: Universality of Solar-wind turbulent spectrum from MHD to electron scales, Phys. Rev. Lett., 103, 165003, doi:10.1103/PhysRevLett.103.165003, 2009.; Bale, ...

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Correlated Interball/Ground-based Observations of Isolated Substor...

By: V. A. Sergeev; T. I. Sergienko; T. Bösinger; A. A. Skalsky; N. L. Borodkova; A. G. Yahnin; V. N. Lutsenko; I. A. Kornilov; M. F. Thomsen; J.-a. Sauvaud; R. D. Belian

Description: Polar Geophysical Institute, Apatity, Russia. We study the isolated substorm that occurred after a long quiet period, which showed all of the substorm signatures except for the first half hour of the expansion phase, which could be characterized as a pseudobreakup sequence, rather than a full-scale substorm onset. During the considered event, the substorm’s instability leads to a current disruption, which starts at the near-Earth plasma sheet and...

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The Effects of the Pre-reversal Exb Drift, the Eia Asymmetry, and ...

By: W.-s. Chen; J.-y. Liu; B. W. Reinisch; C.-c. Lee; F.-d. Chu

Description: General Education Center, Ching-Yun University, No. 229, Chienshin Road, Jhongli City, Taoyuan County 320, Taiwan. We use a digisonde at Jicamarca and a chain of GPS receivers on the west side of South America to investigate the effects of the pre-reversal enhancement (PRE) in ExB drift, the asymmetry (Ia) of equatorial ionization anomaly (EIA), and the magnetic activity (Kp) on the generati...

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Coordinated Interhemispheric Superdarn Radar Observations of the I...

By: M. W. Dunlop; J. M. Bosqued; M. Lester; A. S. Yukimatu; C. J. Owen; H. Rème; J. A. Wild; A. Balogh; M. G. G. T. Taylor; N. Sato; S. E. Milan; S. W. H. Cowley; J. A. Davies; A. N. Fazakerley

Description: Department of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, UK. At 10:00 UT on 14 February 2001, the quartet of ESA Cluster spacecraft were approaching the Northern Hemisphere high-latitude magnetopause in the post-noon sector on an outbound trajectory. At this time, the interplanetary magnetic field incident upon the dayside magnetopause was oriented southward and duskward (BZ negative, BY positive), having turned from a northwa...

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Average Thermospheric Wind Patterns Over the Polar Regions, as Obs...

By: H. Lühr; H. Liu; S. Rentz; P. Ritter; K. Häusler

Description: GeoForschungZentrum Potsdam, Germany. Measurements of the CHAMP accelerometer are utilized to investigate the average thermospheric wind distribution in the polar regions at altitudes around 400 km. This study puts special emphasis on the seasonal differences in the wind patterns. For this purpose 131 days centered on the June solstice of 2003 are considered. Within that period CHAMP's orbit is precessing once through all local times. The cross-track wi...

Richmond, A. D.: Ionospheric dynamics using magnetic Apex coordinates, J. Geomagn. Geoelectr., 47, 191–212, 1995.; Aruliah, A. L., Farmer, A. D., Rees, D., and Brandstrøm, U.: The seasonal behaviour of high-latitude thermospheric winds and ion velocities observed over one solar cycle, J. Geophys. Res., 101, 15 701–15 711, 1996.; Condrescu, M. V., Fuller-Rowell, T. J., Foster, J. C., Holt, J. M., and Cariglia, S. J.: Electric field variability associated with the Millston...

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Solar Wind Heating by an Embedded Quasi-isothermal Pick-up Ion Flu...

By: H. J. Fahr

Description: Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn Auf dem Hügel 71, D-53121 Bonn, Germany. It is well known that the solar wind plasma consists of primary ions of solar coronal origin and secondary ions of interstellar origin. Interstellar H-atoms penetrate into the inner heliosphere and when ionized there are converted into secondary ions. These are implanted into the magnetized solar wind flow and are essentially enforc...

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The Effect of a Gamma Ray Flare on Schumann Resonances : Volume 30...

By: A. P. Nickolaenko; Y. Hobara; M. Hayakawa; O. Pechony; Y. T. Tanaka; I. G. Kudintseva

Description: Usikov Institute for Radio-Physics and Electronics, National Academy of Sciences of the Ukraine, 12, Acad. Proskura Street, Kharkov 61085, Ukraine. We describe the ionospheric modification by the SGR 1806-20 gamma flare (27 December 2004) seen in the global electromagnetic (Schumann) resonance. The gamma rays lowered the ionosphere over the dayside of the globe and modified the Schumann resonance spectra. We present the extremely low frequency (EL...

Ando, Y., Maltsev, P., Sukhynyuk, A., Goto, T., Yamauchi, T., Hobara, Y., Sekiguchi, M., Ikegami, Y., Sera, M., Korepanov, V., and Hayakawa, M.: New ELF observation system at Moshiri, Japan and assessment of acquired data, J. Atmos. Electr., 25, 29–39, 2005.; Danilov, D. L. and Zhiglyavsky, A. A. (Eds.): Principal Component of The Time Series: the Caterpillar Method, St.-Petersburg state University, St-Petersburg, Russia, 307 pp., 1997 (in Russian).; Gendrin, R. and Stef...

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Corrigendum to Development of the Mesospheric Na Layer at 69° N Du...

By: U.-p. Hoppe; M. Rapp; G. Stober; T. Dunker

Description: Department of Physics and Technology, University of Tromsø – The Arctic University of Norway, 9037 Tromsø, Norway. No abstract available.

Dunker, T., Hoppe, U.-P., Stober, G., and Rapp, M.: Development of the mesospheric Na layer at 69° N during the Geminids meteor shower 2010, Ann. Geophys., 31, 61–73, doi:10.5194/angeo-31-61-2013, 2013.

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Interball-auroral Observations of 0.1-12 Kev Ion Gaps in the Diffu...

By: J.-a. Sauvaud; D. C. Delcourt; R. A. Kovrazhkin

Description: IKI, Moscow, Russia. We examine ion flux dropouts detected by INTERBALL-Auroral upon traversal of the auroral zone at altitudes of \sim13 000 up to 20 000 km. These dropouts which we refer to as "gaps", are frequently observed irrespectively of longitudinal sector and appear characteristic of INTERBALL-Auroral ion spectrograms. Whereas some of these gaps display a nearly monoenergetic character (~12 keV), others occur at energies of a few hundreds of e...

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The Structure and Origin of Magnetic Clouds in the Solar Wind : Vo...

By: V. Bothmer; R. Schwenn

Description: Space Science Department of ESA, ESTEC, 2200 AG Noordwijk, The Netherlands. Plasma and magnetic field data from the Helios 1/2 spacecraft have been used to investigate the structure of magnetic clouds (MCs) in the inner heliosphere. 46 MCs were identified in the Helios data for the period 1974–1981 between 0.3 and 1 AU. 85% of the MCs were associated with fast-forward interplanetary shock waves, supporting the close association between MCs and SMEs (sol...

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High Time Resolution Measurements of the Thermosphere from Fabry-p...

By: A. L. Aruliah; E. M. Griffin; I. McWhirter; E. A. K. Ford

Description: Atmospheric Physics Laboratory, Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK. Recent advances in the performance of CCD detectors have enabled a high time resolution study of the high latitude upper thermosphere with Fabry-Perot Interferometers (FPIs) to be performed. 10-s integration times were used during a campaign in April 2004 on an FPI located in northern Sweden in the auroral oval. The FPI is u...

Aruliah, A. L., Fuller-Rowell, T. J., and Rees, D.: The Combined Effect of Solar and Geomagnetic Activity on High-Latitude Thermospheric Neutral Winds: I: Observations, J. Atmos. Terr. Phys., 53, 467–483, 1991.; Aruliah, A. L. and Rees, D.: The trouble with thermospheric vertical winds: geomagnetic, seasonal and solar cycle dependence at high latitudes, J. Atmos. Terr. Phys., 57, 597–609, 1995.; Aruliah, A. L., Griffin, E. M., Aylward, A. D., Ford, E. A. K., Kosch, M. J....

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The New Athens Center on Data Processing from the Neutron Monitor ...

By: Sarlanis; Papaioannou; Souvatzoglou; Plainaki; Gerontidou; Mavromichalaki; Eroshenko; Tatsis; Belov; Mariatos; Yanke

Description: University of Athens, Physics Department, Section of Nuclear and Particle Physics, Zografos 15 771, Athens, Greece. The ground-based neutron monitors (NMs) record galactic and solar relativistic cosmic rays which can play a useful key role in space weather forecasting, as a result of their interaction with interplanetary disturbances. The Earth's-based neutron monitor network has been used in order to produce a real-time prediction of space weather pheno...

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Simultaneous Observations of Large-scale Traveling Ionospheric Dis...

By: J. S. Xu; F. Yin; Y. W. Liu; S. Y. Ma; H. T. Cai

Description: Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan, 430072, China. In this paper, we present further observational evidence for the transpolar propagation of large-scale traveling ionospheric disturbances (LSTIDs) from their nightside source region to the dayside reported by Cai et al. (2011). Slant total electron content (STEC) observed by longitudinally aligned GPS receiver chains in North American and European sect...

Afraimovich, E. L., Kosogorov, E. A., Leonovich, L. A., Palamartchouk, K. S., Perevalova, N. P., and Pirog, O. M.: Determining parameters of large-scale traveling ionospheric disturbances of auroral origin using GPS-arrays, J. Atmos. Sol. Terr. Phys., 62, 553–565, 2000.; Balthazor, R. L. and Moffett, R. J.: Morphology of large-scale traveling atmospheric disturbances in the polar thermosphere, J. Geophys. Res., 104, 15–24, 1999.; Bowman, G. G. and Mortimer, I. K.: Some c...

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Comprehensive Survey of Pc4 and Pc5 Band Spectral Content in Clust...

By: T. K. Yeoman; L. B. N. Clausen

Description: Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK. In the first part of this study we present two case studies of pulsations that, with the help of ground-based data, are identified as field line resonances (FLRs). These pulsations occurred at frequencies which belong to a set of frequencies that has been suggested to be preferred in the terrestrial magnetosphere (CMS frequencies). We go on to show that for both events t...

Dungey, J W.: Electrodynamics of the outer atmosphere, in: Ionos. Res. Sci. Rep. 69, Pennsylvania State University, 1954.; Baker, G J., Donovan, E F., and Jackel, B J.: A comprehensive survey of auroral latitude Pc5 pulsation characteristics, J. Geophys. Res., 108, 1384, \doi10.1029/2002JA009801, 2003.; Chen, L. and Hasegawa, A.: A theory of long-period magnetic pulsations, 1. Steady state excitation of field line resonance, J. Geophys. Res., 79, 1024–1032, 1974.; Clause...

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Noon Ionospheric Signatures of a Sudden Commencement Following a S...

By: J.-c. Cerisier; M. Lester; N. Sato; A. Vontrat-reberac

Description: CETP/CNRS, Paris, France. Using experimental data from the Cutlass Super-DARN HF radars and from a subset of ground magnetometers of the IMAGE Scandinavian chain, the response of the ionosphere in the noon sector to a solar wind pressure increase is studied. The emphasis is on the signature of the convection vortices and of the Hall currents that are associated with the pair of opposite parallel currents flowing along the morning and afternoon hi...

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Resistive Mhd Reconstruction of Two-dimensional Coherent Structure...

By: J. Birn; B. U. Ö. Sonnerup; R. E. Denton; W.-l. Teh

Description: Laboratory for Atmospheric and Space Physics, Boulder, CO, USA. We present a reconstruction technique to solve the steady resistive MHD equations in two dimensions with initial inputs of field and plasma data from a single spacecraft as it passes through a coherent structure in space. At least two components of directly measured electric fields (the spacecraft spin-plane components) are required for the reconstruction, to produce two-dimensional (2-D) f...

Birn, J., Fletcher, L., Hesse, M., and Neukirch, T.: Energy release and transfer in solar flares: Simulation of three-dimensional reconnection, ApJ, 695, 1151–1162, 2009.; Denton, R. E., Sonnerup, B. U. Ö., Birn, J., Teh, W.-L., and Drake, J. F.: Test of method to infer the magnetic reconnection directions from spacecraft data, J. Geophys. Res., 115, A10242, doi:10.1029/2010JA015420, 2010.; Eriksson, S., Hasegawa, H., Teh, W.-L., Sonnerup, B. U. Ö., McFadden, J. P., Glas...

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Waveform and Packet Structure of Lion Roars : Volume 17, Issue 12 ...

By: E. Georgescu; K.-h. Fornacon; R. A. Treumann; G. Haerendel; W. Baumjohann; U. Auster

Description: Max-Planck-Institut für extraterrestrische Physik, Garching, Germany. The Equator-S magnetometer is very sensitive and has a sampling rate of normally 128 Hz. The high sampling rate allows for the first time fluxgate magnetometer measurements of ELF waves between the ion cyclotron and the lower hybrid frequencies in the equatorial dayside magnetosheath. The so-called lion roars, typically seen by the Equator-S magnetometer at the bottom of the magnetic ...

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Monstrous Ocean Waves During Typhoon Krosa : Volume 26, Issue 6 (1...

By: C. C. Kao; H. S. Chen; D.-j. Doong; P. C. Liu; Y.-j. G. Hsu

Description: NOAA Great Lakes Environmental Research Laboratory, Ann Arbor, MI, USA. This paper presents a set of ocean wave time series data recorded from a discus buoy deployed near northeast Taiwan in western Pacific that was operating during the passage of Typhoon Krosa on 6 October 2007. The maximum trough-to-crest wave height was measured to be 32.3 m, which could be the largest Hmax ever recorded.

Holliday, N. P., Yelland, M. J., Pascal, R., Swail, V. R., Taylor, P. K., Griffiths, C. R., and Kent, E.: Were extreme waves in the Rockall Trough the largest ever recorded?, Geophys. Res. Lett., 33, L05613, doi:10.1029/2005GL025238, 2006.; Wang, D. W., Mitchell, D. A., Teague, W. J., Jarosz, E., and Hulbert, M. S.: Extreme waves under Hurricane Ivan, Science, 309, 896, doi:10.1126/science.1112509, 2005.

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