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Meteor Trail Characteristics Observed by High Time Resolution Lida...

By: J. M. C. Plane; X. W. Cheng; B. R. Clemesha; Y. J. Liu; J. H. Wang

Description: Instituto Nacional de Pesquisas Espaciais, Avenida dos Astronautas, 1758, 12227-010 São Jose dos Campos, Brazil. We report and analyse the characteristics of 1382 meteor trails based on a sodium data set of ~ 680 h. The observations were made at Yanqing (115.97° E, 40.47° N), China by a ground-based Na fluorescence lidar. The temporal resolution of the raw profiles is 1.5 s and the altitude resolution is 96 m. We discover some characteristics of meteor ...

Brosch, N., Häggström, I., Pellinen-Wannberg, A., and Westman, A.: Unusual features in high statistics radar meteor studies at EISCAT, Mon. Not. R. Astron. Soc., 401, 1069–1079, 2010.; Campbell-Brown, M. D. and Jones, J.: Annual variation of sporadic radar meteor rates, Mon. Not. R. Astron. Soc., 367, 709–716, 2006.; Ceplecha, Z., Borovička, J., Elford, W., ReVelle, D., Hawkes, R., Porubčan, V., and Šimek, M.: Meteor Phenomena and Bodies, Space Sci. Rev., 84, 327–471, 19...

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Comparison of Model Electron Densities and Temperatures with Mills...

By: M. J. Buonsanto; A. V. Pavlov

Description: Institute of Terrestrial Magnetism, Ionosphere and Radio-Wave Propagation, Russia Academy of Science (IZMIRAN), Troitsk, Moscow Region, 142092, Russia. Measurements of F-region electron density and temperature at Millstone Hill are compared with results from the IZMIRAN time-dependent mathematical model of the Earth's ionosphere and plasmasphere during the periods 16–23 March and 6–12 April 1990. Each of these two periods included geomagnetically quiet i...

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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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Equinox Transition at the Magnetic Equator in Africa: Analysis of ...

By: P. M. Vila; M. Petitdidier; C. Amory-mazaudier; B. J.-p. Adohi

Description: Université de Cocody, Laboratoire de Physique de l'Atmosphère, 22 BP 582 Abidjan 22, Ivory Coast. We study equatorial night-time F layer behaviour from quarter-hourly ionograms at Korhogo/Ivory Coast (9.2° N, 5° W, dip lat. −2.4°) during local Spring March–April 1995, declining solar flux period, according to the magnetic activity. The height and thickness of the F-layer are found to vary intensely with time and from one day to the next. At time of the ...

Blanc M. and Richmond, A.: The ionospheric disturbance dynamo, J. Geophys. Res., 85, 1669–1686, 1980.; Aarons, J., Mendillo, M., Yantosca, R., and Kudeki, E.: GPS phase fluctuations in the equatorial region during the MISETA 1994 campaign, J. Geophys. Res., 101(A12), 26 851–26 862, 1996.; Basu, S., Kudeki, E., Basu, S., Valladares, C. E., Weber, E. J., Zengingonul, H. P., Bhattacharyya, S., Sheehan, R., Meriwether, J. W., Biondi, M. A., Kuenzler, H., and Espinoza, J.: Sc...

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Pulsed Flows at the High-altitude Cusp Poleward Boundary, and Asso...

By: J. D. Kelly; A. Balogh; M. W. Dunlop; H. Rème; J.-c. Cerisier; C. Mouikis; E. Möbius; J.-a. Sauvaud; S. W. H. Cowley; J.-m. Bosqued; E. J. Lund; J. A. Wild; C. W. Carlson; C. J. Farrugia; P. E. Sandholt; G. K. Parks

Description: Space Science Center and Department of Physics, University of New Hampshire, NH, USA. Particle and magnetic field observations during a magnetic conjunction Cluster 1-FAST-Søndrestrøm within the field of view of SuperDARN radars on 21 January 2001 allow us to draw a detailed, comprehensive and self-consistent picture at three heights of signatures associated with transient reconnection under a steady south-westerly IMF (clock angle ≈130°). Cluster 1 w...

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Solar and Seasonal Dependence of Ion Frictional Heating : Volume 1...

By: I. W. McCrea; M. Lester; J. A. Davies

Description: Radio and Space Plasma Physics Group, Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK. Ion frictional heating constitutes one of the principal mechanisms whereby energy, originating in the solar wind, is deposited into the Earth's ionosphere and ultimately the neutral atmosphere. Common programme observations by the EISCAT UHF radar system, spanning the years 1984 to 1995, provide the basis for a comp...

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Two Types of Elf Hiss Observed at Varanasi, India : Volume 17, Iss...

By: A. K. Singh; D. K. Singh; R. P. Singh; R. P. Patel; Ashok K. Singh

Description: Atmospheric Research Laboratory, Department of Physics, Banaras Hindu University, Varanasi-221005, India. The morphology of ELF hiss events observed at low-latitude ground station Varanasi (L = 1.07, geomagnetic latitude 14°55'N) are reported, which consist of two types: (1) events which propagated in ducted mode along the geomagnetic field line corresponding to observing station Varanasi and (2) events which propagated in ducted mode along higher L-valu...

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Letter to the Editoron the Use of the Sunspot Number for the Estim...

By: Vaquero

Description: Departamento de Física, Escuela Politécnica, Universidad de Extremadura, 10071 Cáceres, Spain. In this short contribution the use of different sunspot numbers for the estimation of past solar and upper atmosphere conditions from historical and modern auroral observations realised by Schröder et al. (2004) is analysed. Moreover, some comments are made on the relationships between mean annual visual observations of the auroras at middle latitudes of Europe...

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Vertical and Longitudinal Electron Density Structures of Equatoria...

By: G. Uma; K.-h. Wu; H.-p. Hsia; Y.-h. Chu; C.-l. Su; P. S. Brahmanandam

Description: Dept. of Electronics & Communication Engineering, K L University, Vaddeswaram 522502, India. From global soundings of ionospheric electron density made with FORMOSAT 3/COSMIC satellites for September 2006–August 2009, day-night variations in vertical and longitudinal structures of the electron densities in equatorial E- and F-regions for different seasons are investigated for the first time. The results reveal that the wavenumber-3 and wavenumber-4 patte...

Forbes, J. M., Zhang, X., Ward, W., and Talaat, E.: Nonmigrating diurnal tides in the thermosphere, J. Geophys. Res., 108(A1), 1033, doi:10.1029/2002JA009262, 2003.; England, S. L., Immel, T. J., Sagawa, E., Henderson, S. B., Hagan, M. E., Mende, S. B., Frey, H. U., Swenson, C. M., and Paxton, L. J.: The effects of atmospheric tides on the morphology of the quiet-time, post-sunset equatorial ionospheric anomaly, J. Geophys. Res., 111, A10S19, doi:10.1029/2006JA011795, 20...

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Coronal Magnetic Fields Inferred from Ir Wavelength and Comparison...

By: Y. Liu

Description: Yunnan Astronomical Observatory, National Astronomical Observatories, Kunming 650011, China. Spectropolarimetry using IR wavelength of 1075 nm has been proved to be a powerful tool for directly mapping solar coronal magnetic fields including transverse component directions and line-of-sight component intensities. Solar tomography, or stereoscopy based on EUV observations, can supply 3-D information for some magnetic field lines in bright EUV loops. In a...

Brosius, J. W., Davila, J. M., Thomas, R. J., and White, S. M.: Coronal magnetography of a solar active region using coordinated SERTS and VLA observations , Astrophys. J., 488, 488–498, 1997.; Casini, R. and Judge, P. G.: Spectral lines for polarization measurements of the coronal magnetic field. II. consistent treatment of the Stokes vector for magnetic-dipole transitions, Astrophys. J., 522, 524–539, 1999.; Gary, D. E. and Hurford, G. J.: Coronal temperature, density,...

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Dynamical Evolution of the Inner Heliosphere Approaching Solar Act...

By: J. A. Linker; Z. Mikić; P. Riley

Description: Science Applications International Corporation, 10260 Campus Point Dr., San Diego, CA 92121, USA. In this study we describe a series of MHD simulations covering the time period from 12 January 1999 to 19 September 2001 (Carrington Rotation 1945 to 1980). This interval coincided with: (1) the Sun’s approach toward solar maximum; and (2) Ulysses’ second descent to the southern polar regions, rapid latitude scan, and arrival into the northern polar re...

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On the Development and Evolution of Nonlinear Ion Acoustic Wave Pa...

By: A. M. Hamza

Description: Physics Dept., University of New Brunswick, POB 4400, Fredericton, E3B 5B-5A3, Canada. A simple model of ion fluctuations (ion acoustic and ion cyclotron fluctuations for example) driven by an electron current which leads to intermittent fluctuations when the linear growth rate exceeds the wave packet dispersion rate is analized. The normalized fluctuation amplitude eφ0/T can be much larger than the mass ratio (me/m...

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Manifestation of Solar Activity in the Global Topside Ion Composit...

By: J. Šmilauer; V. Truhlík; L. Trísková

Description: Institute of Atmospheric Physics, Acad. Sci. Czech Rep., BočníII., 14131 Praha 4-Sporilov, Czech Republic. The solar cycle variation of the most important parameters characterizing the ion composition in the topside ionosphere is studied. For this purpose data from the ACTIVE mission (the IK-24 satellite) for the maximum of solar cycle 22 (aver F10.7~200), complemented by data available from the Atmosphere Explorer (AE) satellites, for the minimum of sol...

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Evaluation of Energetic Particle Parameters in the Near-earth Magn...

By: Q. G. Zong; R. H. W. Friedel; A. Korth; A. Roux; Z. X. Chen; Z. Y. Pu; S. Perraut

Description: Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany. The flux asymmetries measured by spectrometers on board spacecraft contain information on particle parameters. The net flux intensity (NFI) method provides a tool to evaluate these parameters. The NFI method is valid when both the spin period of the spacecraft and the time resolution of the particle spectrometers are much shorter than the characteristic time-scale of the particle flu...

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Observations of Plasma Vortices in the Vicinity of Flow-braking: a...

By: V. Angelopoulos; A. Retinò; M. Volwerk; R. Nakamura; J. P. McFadden; I. Mann; K. Keika; D. Larson; M. Fujimoto; W. Baumjohann; H. U. Auster; H. J. Singer; J. W. Bonnell

Description: Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, Austria. We examine fast plasma flows and magnetic field fluctuations observed by THEMIS at 03:00–03:30 UT on 12 December 2007. All THEMIS probes are situated in the near-Earth plasma sheet (XSM>−10 RE) with 1–2 RE spacecraft separations in azimuthal and radial directions. We focus on the observations of plasma conve...

Angelopoulos, V.: The THEMIS mission, Space Sci. Rev., 141, 5–34, doi:10.1007/s11214-11008-19336-11211, 2008.; Angelopoulos, V., Baumjohann, W., Kennel, C. F., Coronti, F. V., Kivelson, M. G., Pellat, R., Walker, R. J., Lühr, H., and Paschmann, G.: Bursty bulk flows in the inner central plasma sheet, J. Geophys. Res., 97, 4027–4039, 1992.; Auster, H. U., Glassmeier, K. H., Magnes, W., et al.: The THEMIS fluxgate magnetometer, Space Sci. Rev., 141, 235–264, doi10.1007/s11...

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Invariability of Relationship Between the Polar Cap Magnetic Activ...

By: A. S. Janzhura; N. A. Podorozhkina; O. A. Troshichev

Description: Arctic and Antarctic Research Institute, St. Petersburg, 199397, Russia. The PC (polar cap) index characterizing the solar wind energy input into the magnetosphere is calculated with use of parameters α, β, and Φ, determining the relationship between the interplanetary electric field (EKL) and the value of magnetic activity ΔF in the polar caps. These parameters were noted as valid for large and small EKL values...

Janzhura, A. S. and Troshichev, O. A.: Determination of the running quiet daily geomagnetic variation, J. Atmos. Solar-Terr. Phys., 70, 962–972, 2008.; Janzhura, A. S. and Troshichev, O. A.: Identification of the IMF sector structure in near-real time by ground magnetic data, Anna. Geophys., , 2011.; Kan, J. R. and Lee, L. C.: Energy coupling function and solar wind-magnetosphere dynamo, Geophys. Res. Lett., 6, 577–580, 1979.; Janzhura, A., Troshichev, O., and Stauning, ...

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Space Weather Effects on Drilling Accuracy in the North Sea : Volu...

By: J. Bowe; O. Baillie; W. Allen; S. MacMillan; S. J. Reay; E. Clarke; V. Lesur

Description: British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK. The oil industry uses geomagnetic field information to aid directional drilling operations when drilling for oil and gas offshore. These operations involve continuous monitoring of the azimuth and inclination of the well path to ensure the target is reached and, for safety reasons, to avoid collisions with existing wells. Although the most accurate method of achieving thi...

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Causal Relationships Between Eruptive Prominences and Coronal Mass...

By: B. Filippov; S. Koutchmy

Description: Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences (IZMIRAN), Troitsk Moscow Region, Russia. A close association between eruptive prominences and CMEs, both slow and fast CMEs, was reported in many studies. Sometimes it was possible to follow the material motion starting from the prominence (filament) activation to the CME in the high corona. Remnants of the prominence were found in the bright core of t...

Chen, J., Marque, C., Vourlidas, A., Krall, J., and Schick, P. W.: The flux-rope scaling of the acceleration of coronal mass ejections and eruptive prominences, Astrophys. J., 649, 452–463, 2006.; Westin,~H. and Liszka,~L.: Motion of ascending prominences, Sol. Phys., 11, 409–424, 1970.; Alexander, D., Liu, R., and Gilbert, H.: Hard X-ray production in a failed filament eruption, Astrophys. J., 653, 719–724, 2006.; Boulade,~S., Delannée,~C., Koutchmy,~S., Lamy,~P., Lleba...

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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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Diurnal, Seasonal, Latitudinal and Solar Cycle Variation of Electr...

By: P. Subrahmanyam; S. C. Garg; P. K. Bhuyan; M. Chamua

Description: Department of Physics, Dibrugarh University, Dibrugarh 786004, India. Electron temperature Te observed by the SROSS C2 satellite at equatorial and low latitudes during the low to high solar activity period of 1995–2001 at the height of ~500 km is investigated in terms of local time, season, latitude, solar sunspot number Rz and F10.7 cm solar flux. The satellite covered the latitude belt of 31° S–34° N and the longitu...

Appleton, E. V.: Two anomalies in the ionosphere, Nature, 157, 691, 1946.; Bailey, G. J., Moffett, R. J., Hanson, W. B., and Sanatani, S.: Effect of interhemispheric transport on plasma temperature at low latitudes, J. Geophys. Res., 78, 5597–5610, 1973.; Balan, N., Oyama, K. I., Bailey, G. J., and Abe, T.: Plasmasphere electron temperature studies using satellite observations and a theoretical model, J. Geophys. Res., 101, 15 323–15 330, 1996a.; Balan, N., Oyama, K. I.,...

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