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Dynamical Critical Scaling of Electric Field Fluctuations in the G...

By: M. L. Parkinson

Description: Department of Physics, La Trobe University, Bundoora Campus, Victoria 3086, Australia. Akasofu's solar wind Ε parameter describes the coupling of solar wind energy to the magnetosphere and ionosphere. Analysis of fluctuations in Ε using model independent scaling techniques including the peaks of probability density functions (PDFs) and generalised structure function (GSF) analysis show the fluctuations were self-affine (mono-fractal, single exponent sca...

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Some Evidence of Ground Power Enhancements at Frequencies of Globa...

By: U. Villante; P. Francia

Description: Dipartimento di Fisica, Universita' dell'Aquila, I-L'Aquila, Italy. A statistical analysis of the power spectra of the geomagnetic field components H and D for periods ranging between 3 min and 1 h was conducted at a low-latitude observatory (L'Aquila, L=1.6) at the minimum and maximum of the solar cycle. For both components, during daytime intervals, we found evidence of power enhancements at frequencies predicted for global modes ...

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A Study Into the Effect of the Diurnal Tide on the Structure of th...

By: A. D. Aylward; N. F. Arnold; M. J. Harris

Description: Atmospheric Physics Laboratory, University College London, 67–73, Riding House Street, London W1P 7PP, UK. A new coupled middle atmosphere and thermosphere general circulation model has been developed, and some first results are presented. An investigation into the effects of the diurnal tide upon the mean composition, dynamics and energetics was carried out for equinox conditions. Previous studies have shown that tides deplete mean atomic oxygen i...

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Magnetohydrodynamic Waves Within the Medium Separated by the Plane...

By: I. V. Despirak; A. A. Lubchich

Description: Polar Geophysical Institute, Kola Science Centre, Russian Academy of Sciences, 184200 Apatity, Russia. Characteristics of small amplitude plane waves within the medium separated by the plane discontinuity into two half spaces are analysed. The approximation of the ideal one-fluid magnetohydrodynamics (MHD) is used. The discontinuities with the nonzero mass flux across them are mainly examined. These are fast or slow shock waves and rotational discontinui...

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Interdependence of Tropical Cirrus Properties and Their Variabilit...

By: K. Parameswaran; Bijoy V. Thampi; S. V. Sunilkumar

Description: Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum-695022, Kerala, India. The mean properties of tropical cirrus, such as cloud top, cloud base, optic centre, cloud strength/optical depth, asymmetry factor and cloud depolarization, as well as their heterogeneities are examined using lidar observations over 281 nights from a tropical station Gadanki (13.5° N, 79.2° E) during the period 1998–2002. This study shows that as the cloud optical...

Santacesaria, V., Carla, R., MacKenzie, R. A., Adriani, A., Cairo, F., Didonfrancesco, G., Kiemle, C., Redaelli, G., Beuermann, J., Schiller, C., Peter, Th., Luo, B. P., Wernli, H., Ravegnani, F., Ulanovsky, A., Yushkov, V., Sitnikov, N., Balestri, S., and Stefanutti, L.: Clouds at the tropical tropopause: A case study during the APE-THESEO campaign over the western Indian Ocean, J. Geophys. Res., 108(D2), 4044, doi:10.1029/2002JD002166, 2003.; Sasi, M. N.: A reference a...

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Settlement Process of Radioactive Dust to the Ground Inferred from...

By: M. Yamauchi; I. Miyagi; M. Makino; M. Takeda; T. Owada

Description: Swedish Institute of Space Physics, Box 812, 98128 Kiruna, Sweden. Radioactive materials from the accident at Fukushima Dai-ichi nuclear power plant (FNPP) in March 2011 spread over a large area, increasing the atmospheric electric conductivity by their ionizing effect, and reducing the vertical (downward) component of the DC electric field near the ground, or potential gradient (PG). PG data at Kakioka, 150 km away from the FNPP, showed independent cha...

Hamilton, R. A. and Paren, J. G.: The influence of radioactive fallout on the atmospheric potential gradient, Meteorol. Mag., 96, 81–85, 1967.; Harris, D. L.: Effects of radioactive debris from nuclear explosions on the electrical conductivity of the lower atmosphere, J. Geophys. Res., 60, 45–52, 1955.; Harrison, R. G.: Twentieth century atmospheric electrical measurements at the observatories of Kew, Eskdalemuir and Lerwick, Weather, 58, 11–19, 2003.; IAEA: Environmenta...

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Smoothness of Ozone Profiles: Analysis of 11 Years of Ozone Sonde ...

By: E. Kyrölä; E. Kyrö; V. F. Sofieva

Description: Finnish Meteorological Institute, Earth Observation, P.O.Box 503 (Vuorikatu 15 A) FIN-00101 Helsinki, Finland. This paper discusses the smoothness of vertical profiles of ozone concentrations. We describe the smoothness of ozone profiles via a characteristic scale of the profile fluctuations. The characteristic scale was computed for 11-years (1989-1999) ozone sonde data at Sodankylä. Mean values of the characteristic scale were determined. They are ~1km...

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Observational Evidences on the Modulation of the South American Lo...

By: J. A. Marengo; G. A. M. Silva; T. Ambrizzi

Description: Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo, Brazil. The differences on the phase and wavelength of the quasi-stationary waves over the South America generated by El Niño (EN) and La Niña (LN) events seem to affect the daily evolution of the South American Low Level Jet east of the Andes (SALLJ). For the austral summer period of 1977–2004 the SALLJ episodes detected a...

Magaña, V. and Ambrizzi, T.: Dynamics of subtropical vertical motions over the Americas during El Niño boreal winters, Atmosfera, 18(4), 211–233, 2005.; Beu, C. M. L. and Ambrizzi, T.: Interannual and interseasonal variability of Southern Hemisphere cyclone frequency (in Portuguese), Brazilian J. Meteorol., 21(1), 44–55, 2006.; Berbery, E. H. and Barros, V. R.: The hydrological cycle of the La Plata basin in South America, J. Hydrometerol., 3, 630–645, 2002.; Bonner, W. ...

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Remote Sensing of the Proton Aurora Characteristics from Image-fuv...

By: H. U. Frey; M. Meurant; J.-c. Gérard; V. I. Shematovich; S. B. Mende; D. V. Bisikalo

Description: Institute of Astronomy, RAS, Moscow, Russia. The combination of simultaneous global images of the north polar region obtained with the IMAGE-FUV imaging system makes it possible to globally map the properties of the electron and proton auroral precipitation. The SI12 imager, which observes the Doppler-shifted Lyman-a emission, provides a global snapshot of the proton aurora every 2 min. These images may be combined with t...

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Inverse Cascade in the Structure of Substorm Aurora and Non-linear...

By: I. V. Golovchanskaya; B. V. Kozelov; O. V. Mingalev

Description: Polar Geophysical Institute, Academgorodok, 26, Apatity, Murmansk region, 184209 Russia. We investigate time evolution of scaling index ΑA that characterizes auroral luminosity fluctuations at the beginning of substorm expansion. With the use of UVI images from the Polar satellite, it is shown that ΑA typically varies from values less than unity to ~1.5, increasing with breakup progress. Similar scaling features were p...

Abry, P., Flandrin, P., Taqqu, M. S., and Veitch, D.: Wavelets for the analysis, estimation and synthesis of scaling data, in: Self-Similar Network Traffic and Performance Evaluation, edited by: Park, K. and Willinger, W., p. 39, Wiley-Interscience, Hoboken, N. J., 2000.; Borovsky, J. E.: Auroral arc thicknesses as predicted by various theories, J. Geophys. Res., 98, 6101–6138, 1993.; Chang, T., Tam, S. W. Y., and Wu, C.: Complexity induced anisotropic bimodal intermitte...

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Storm-time Electron Flux Precipitation in the Inner Radiation Belt...

By: H. Misawa; Y. Katoh; F. Tsuchiya; Y. Miyoshi; A. Morioka; H. Tadokoro

Description: Planetary Plasma and Atmospheric Research Center, Tohoku University, Aoba-ku, Sendai, 980-8578, Japan. It has been believed that electrons in the inner belt do not show the dynamical variation during magnetic storms except for great magnetic storms. However, Tadokoro et al. (2007) recently disclosed that low-altitude electrons in the inner belt frequently show flux variations during storms (Storm Time inner belt Electron Enhancement at the Low altitude (...

Abel, B. and Thorne, R. M.: Electron scattering loss in Earth's inner magnetosphere, 1, Dominant physical processes, J. Geophys. Res., 103, 2385–2396, 1998a.; Abel, B. and Thorne, R. M.: Electron scattering loss in Earth's inner magnetosphere, 2, Sensitivity to model parameters, J. Geophys. Res., 103, 2397–2407, 1998b.; Abel, B. and Thorne, R. M.: Correction to Electron scattering loss in Earth's inner magnetosphere, 1, Dominant physical processes and Electron scattering...

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Production of Artificial Ionospheric Layers by Frequency Sweeping ...

By: V. Paznukhov; B. Reinisch; B. Watkins; T. Pedersen; R. Hamel; M. McCarrick

Description: Space Vehicles Directorate, Air Force Research Laboratory, Hanscom AFB, MA, USA. Artificial ionospheric plasmas descending from the background F-region have been observed on multiple occasions at the High Frequency Active Auroral Research Program (HAARP) facility since it reached full 3.6 MW power. Proximity of the transmitter frequency to the 2nd harmonic of the electron gyrofrequency (2fce) has been noted as a requirement for their o...

Djuth, F. T., Pedersen, T. R., Gerken, E. A., Bernhardt, P., Selcher, C. A., Bristow, W. A., and Kosch, M. J.: Ionospheric modification at twice the electron cyclotron frequency, Phys. Rev. Lett., 94, 125001, doi:10.1103/PhysRevLett.94.125001, 2005.; Kendall, E., Marshall, R., Parris, R. T., Bhatt, A., Coster, A., Pedersen, T., Bernhardt, P., and Selcher, C.: Decameter structure in heater-induced airglow at the High frequency Active Auroral Research Program facility, J. ...

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Electron-cylotron Maser Radiation from Electron Holes: Upward Curr...

By: R. Pottelette; W. Baumjohann; R. A. Treumann

Description: Department of Geophysics and Environmental Sciences, Munich University, Munich, Germany. Electron holes are suggested to be an important source for generation of electron-cyclotron maser radiation. We demonstrate that electron holes generated in a ring-horseshoe distribution in the auroral-kilometric radiation source region have the capacity to emit band-limited radiation. The radiation is calculated in the proper frame of a circular model hole and show...

Buneman, O.: Instability, turbulence, and conductivity in current-carrying plasma, Phys. Rev. Lett., 1, 8–9, doi:10.1103/PhysRevLett.1.8, 1958.; Buneman, O.: Dissipation of currents in ionized media, Phys. Rev., 115, 503–517, doi:10.1103/PhysRev.115.503, 1959.; Dupree, T. H.: Theory of phase-space density holes, Phys. Fluids, 25, 277–289,

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Validation of Modis Derived Aerosol Optical Depth and an Investiga...

By: K. Parameswaran; M. Mohan; S. Suresh Babu; K. Krishna Moorthy; M. Aloysius

Description: Space Physics Laboratory, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Trivandrum – 695 022, India. The influence of wind and humidity on aerosol optical depth (AOD) over the Arabian sea is being investigated using MODIS (Moderate Resolution Imaging Spectroradiometer) Level 3 (Collection-5) and NCEP (National Centres for Environmental Prediction) reanalysis data for the second phase of the Arabian Sea Monsoon Experiment (ARMEX-II) o...

Prospero, J. M., Charlson, R. J., Mohnen, V., Jaenicke, R., Delany, C., Moyere, J., Zoller, W., and Rahn, K.: The atmospheric aerosol system – an overview, Rev. Geophys. Space Phys., 21, 1607–1629, 1983.; Raes, F., Bates, T., and McGovern, F.: The 2nd Aerosol Characterisation Experiment (ACE-2): General overview and main results, Tellus, 52B, 111–125, 2000.; Ramanathan, V., Crutzen, P. J., Lelieveld, J., Mitra, A. P., et al.: Indian Ocean Experiment: An integrated analys...

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The Influence of Solar Activity on Action Centres of Atmospheric C...

By: R. Huth; M. Voiculescu; L. Sfîcă

Description: Faculty of Geography and Geology, Alexandru Ioan Cuza University, Iaşi, Romania. We analyse the response of sea level pressure and mid-tropospheric (500 hPa) geopotential heights to variations in solar activity. We concentrate on the Northern Hemisphere and North Atlantic in the period 1948–2012. Composite and correlation analyses point to a strengthening of the North Atlantic Oscillation and weakening (i.e. becoming more zonal) of the Pacific/North Ame...

Barriopedro, D., García-Herrera, R., and Huth, R.: Solar modulation of Northern Hemisphere winter blocking, J. Geophys. Res., 113, D14118, doi:10.1029/2008JD009789, 2008.; Boberg, F. and Lundstedt, H.: Solar wind variations related to fluctuations of the North Atlantic Oscillation, Geophys. Res. Lett., 29, 13, doi:10.1029/2002GL014903, 2002.; Bochníček, J. and Hejda, P.:...

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Two-dimensional Electric Field Measurements in the Ionospheric Foo...

By: T. K. Yeoman; S. W. H. Cowley; K. A. McWilliams

Description: Department of Physics and Astronomy, Leicester University, University Road, Leicester LE1 7RH, UK. Line-of-sight Doppler velocities from the SuperDARN CUTLASS HF radar pair have been combined to produce the first two-dimensional vector measurements of the convection pattern throughout the ionospheric footprint of a flux transfer event (a pulsed ionospheric flow, or PIF). Very stable and moderate interplanetary magnetic field conditions, along with a pre...

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Atmospheric Composition Forecasting in Europe : Volume 28, Issue 1...

By: B. Bessagnet; L. Menut

Description: Institut Pierre-Simon Laplace, Laboratoire de Météorologie Dynamique, CNRS UMR 8539, Ecole Polytechnique, Palaiseau, France. The atmospheric composition is a societal issue and, following new European directives, its forecast is now recommended to quantify the air quality. It concerns both gaseous and particles species, identified as potential problems for health. In Europe, numerical systems providing daily air quality forecasts are numerous and, mostly...

Amann, M., Bertok, I., Cofala, J., Gyarfas, F., Heyes, C., Klimont, Z., Schopp, W., and Winiwater, W.: Clean Air for Europe (CAFE) program final report, Int. Inst. for Appl. Syst. Anal., Laxenburg, Austria, 2005.; Andersson, C., Bergström, R., and Johansson, C.: Population exposure and mortality due to regional background PM in Europe – Long-term simulations of source region and shipping contributions, Atmospheric Environment, 43, 3614–3620,

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Lhr Effects in Nonducted Whistler Propagation – New Observations a...

By: D. R. Shklyar; P. Třiska; F. Jiřiček

Description: Institute of Atmospheric Physics, Acad. Sci. Czech Republic, Boční II, 141 31 Prague 4, Czech Republic. VLF-ELF broadband measurements onboard the MAGION 4 and 5 satellites at heights above 1 Re in plasmasphere provide new data on various known phenomena related to ducted and nonducted whistler wave propagation. Two examples are discussed: magnetospherically reflected (MR) whistlers and lower hybrid resonance (LHR) noise band. We present examples of rat...

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Introduction: Professor Lance Thomas's 70Th Birthday : Volume 18, ...

By: G. Vaughan
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