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The Role of the Vertical E×B Drift for the Formation of the Longit...

By: H. Kil; W.-t. Kim; S.-j. Oh; Y. H. Kim; L. J. Paxton

Description: Department of Physics and Astronomy, FPRD, Seoul National University, Seoul, Korea. The formation of a longitudinally periodic plasma density structure in the low-latitude F region by the effect of vertical E×B drift was investigated by analyzing the ROCSAT-1 satellite data and conducting SAMI2 model simulations. The daytime equatorial ionosphere observed during the equinox in 1999–2002 from ROCSAT-1 showed the formation of wa...

England, S. L., Maus, S., Immel, T. J., and Mende, S. B.: Longitudinal variation of the E-region electric fields caused by atmospheric tides, Geophys. Res. Lett., 33, L21105, doi:10.1029/2006GL027465, 2006a.; 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.: Effect of atmospheric tides on the morphology of the quiet time, postsunset equatorial ionospheric anomaly, J. Geophys. Res., 111,...

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Electromagnetic Oscillations of the Earth's Upper Atmosphere (Revi...

By: T. D. Kaladze; A. Ishimaru; G. V. Jandieri; A. G. Khantadze; Zh. M. Diasamidze

Description: Metrology and Hydrology Department, Tbilisi State University, Chavchavadze Avenue, 1, 0128, Tbilisi, Georgia. A complete theory of low-frequency MHD oscillations of the Earth's weakly ionized ionosphere is formulated. Peculiarities of excitation and propagation of electromagnetic acoustic-gravity, MHD and planetary waves are considered in the Earth's ionosphere. The general dispersion equation is derived for the magneto-acoustic, magneto-gravity and ele...

Aburjania, G. D., Jandieri, G. V., and Khantadze, A. G.: Self – organization of planetary electromagnetic waves in E–region of the ionosphere, J. Atmos. Solar-Terr. Phys., 65(6), 661–671, 2003.; Aburjania, G. D., Chargazia, K. Z., Jandieri, G. V., Khantadze, A. G., and Kharshiladze, O. A.: On the new modes of planetary-scale electromagnetic waves in the ionosphere, Ann. Geophys., 22, 1203–1211, doi:10.5194/angeo-22-1203-2004, 2004.; Aburjania, G. D., Chargazia, Kh. Z., J...

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Non-linear Modelling of Monthly Mean Vorticity Time Changes: an Ap...

By: S. Palmieri; M. Finizio

Description: University of Rome La Sapienza, Dep. of Physics, Piazzale A.Moro 2, I-00185 Rome Italy. Starting from a number of observables in the form of time-series of meteorological elements in various areas of the northern hemisphere, a model capable of fitting past records and predicting monthly vorticity time changes in the western Mediterranean is implemented. A new powerful statistical methodology is introduced (MARS) in order to capture the non-linear dynami...

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Cutlass Hf Radar Observations of High-velocity E-region Echoes : V...

By: M. V. Uspensky; P. Eglitis; S. E. Milan; R. Pirjola; A. Huuskonen; A. V. Koustov; T. Pulkkinen

Description: Finnish Meteorological Institute, Geophysical Research, PO Box 503, FIN-00101, Helsinki, Finland. A short event of high-velocity E-region echo observations by the Pykkvibaer HF radar is analysed to study echo parameters and the echo relation to the Farley-Buneman plasma instability. The echoes were detected in several beams aligned closely to the magnetic L-shell direction. Two echo groups were identified: one group corresponded to the classical type ...

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Plasma Flow Channels with Ulf Waves Observed by Cluster and Double...

By: A. Runov; T. L. Zhang; A. Balogh; M. Volwerk; K.-h. Glassmeier; C. M. Carr; R. Nakamura; W. Baumjohann; B. Klecker; H. Rème; T. Takada; H. U. Eichelberger

Description: Space Research Institute, Austrian Academy of Sciences, A-8042 Graz, Austria. On 14 August 2004 a large-scale magnetic structure was observed by Double Star TC-1 in the southern lobe and by Cluster in the northern lobe of the magnetotail. The structure has the signature of a (localized) dipolarization, decreasing Bx accompanied by an increasing Bz and a strong earthward flow. The propagation direction of this structure...

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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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Long-term Trends of FOe and Geomagnetic Activity Variations : Volu...

By: B. A. De La Morena; A. V. Mikhailov

Description: Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Troitsk, Moscow Region 142190, Russia. A relationship between foE trends and geomagnetic activity long-term variations has been revealed for the first time. By analogy with earlier obtained results on the foF2 trends it is possible to speak about the geomagnetic control of the foE long-term trends as well. Periods of increasing geomagnetic activity corresp...

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The Ultra-fast Kelvin Waves in the Equatorial Ionosphere: Observat...

By: H. Takahashi; I. S. Batista; A. N. Onohara

Description: Aeronomy Division, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, Brazil. The main purpose of this study is to investigate the vertical coupling between the mesosphere and lower thermosphere (MLT) region and the ionosphere through ultra-fast Kelvin (UFK) waves in the equatorial atmosphere. The effect of UFK waves on the ionospheric parameters was estimated using an ionospheric model which calculates electrostatic potential in the E-regi...

Abdu, M. A., Ramkumar, T. K., Batista, I. S., Brum, C. G. M., Takahashi, H., Reinisch, B. W., and Sobral, J. H. A.: Planetary wave signature in the equatorial atmosphere-ionosphere system, and mesosphere E- and F-region coupling, J. Atmos. Sol-Terr. Phys., 68, 509–522, 2006.; Andrews, D. G., Holton, J. R., and Leovy, C. B.: Middle Atmospheric Dynamics. Academic Press, pp. 489, 1987.; Batista, I. S., Abdu, M. A., and Bittencourt, J. A.: Equatorial F region vertical plasma...

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A Statistical Study of Magnetic Dipolarization for Sawtooth Events...

By: C. R. Clauer; X. Cai; M. G. Henderson

Description: Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan, USA. We investigate whether the dipolarization process during sawtooth events is global or not through an examination of the local time distribution of the magnetic tilt angle (i.e. the angle between the B vector and the equatorial plane in dipole VDH coordinates) at geostationary orbit. From the statistical analysis of 207 individual ...

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Complexity in the Scaling of Velocity Fluctuations in the High-lat...

By: M. L. Parkinson

Description: Department of Physics, La Trobe University, Victoria 3086, Australia. The temporal scaling properties of F-region velocity fluctuations, δvlos, were characterised over 17 octaves of temporal scale from τ=1 s to <1 day using a new data base of 1-s time resolution SuperDARN radar measurements. After quality control, 2.9 (1.9) million fluctuations were recorded during 31.5 (40.4) days of discretionary mode soundings using the Tasmanian (N...

Abel, G. A., Freeman, M. P., and Chisham, G.: Spatial structure of ionospheric convection velocities in regions of open and closed magnetic field topology, Geophys. Res. Lett., 33, L24103, doi:10.1029/2006GL027919, 2006.; Abel, G. A., Freeman, M. P., Chisham, G., and Watkins, N. W.: Investigating turbulent structure of ionospheric plasma velocity using the Halley SuperDARN radar, Nonlin. Processes Geophys., 14, 799–809, 2007.; Bak, P., Tang, C., and Wiesenfeld, K.: Self-...

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On the Validity of the Ambipolar Diffusion Assumption in the Polar...

By: N. J. Mitchell; P. B. Chilson; R. D. Palmer; A. P. Ballinger

Description: Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, USA. The decay of underdense meteor trails in the polar mesopause region is thought to be predominantly due to ambipolar diffusion, a process governed by the ambient temperature and pressure. Hence, observations of meteor decay times have been used to indirectly measure the temperature of the mesopause region. Using meteor observations from a SKiYMET radar in northern Swede...

Aitchison, J. and Brown, J. A C.: The lognormal distribution, Cambridge University Press, Cambridge, 1957.; Ballinger, A.: Radio-wave scatter and dynamical processes in the polar mesopause region observed using MST and meteor radars, MSc Thesis, University of Oklahoma, 2007.; Brasseur, G. and Solomon, S.: Aeronomy of the middle atmosphere, D. Reidel Publishing Company, Dordrecht, Holland, second edn., 1986.; Chilson, P B., Czechowsky, P., and Schmidt, G.: A comparison of...

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High Time Resolution Boundary Layer Description Using Combined Rem...

By: E. G. Norton; E. Walker; J. Nash; T. J. Hewison; J. Jones; C. Gaffard

Description: Met Office, University of Reading, Meteorology Building 1U20, P.O. Box 243, Earley Gate Reading RG6 6BB, UK. Ground based remote sensing systems for future observation operations will allow continuous monitoring of the lower troposphere at temporal resolutions much better than every 30 min. Observations which may be considered spurious from an individual instrument can be validated or eliminated when considered in conjunction with measurements from other...

Klaus, V., Bianco, L., Gaffard, C., Matabuena, M., and Hewison, T. J.: Combining UHF radar wind profiler and microwave radiometer for the estimation of atmospheric humidity profiles, Meteorologische Zeitschrift, 15, 87–98, 2006.; Lean, H. W. and Clarke, P.: The effect of changing resolution on mesoscale modelling of line convection and slantwise circulation in FASTEX IOP16, Q. J. Roy. Meteorol. Soc., 129, 189–209, 2003.; Bevis, M., Businger, S., Herring, T. A., Rocken, C...

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A Statistical and Event Study of Magnetotail Dipolarization Fronts...

By: M. Volwerk; R. Nakamura; M. Heyn; D. Schmid; W. Baumjohann

Description: Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria. A study of dipolarization fronts of the Earth's magnetotail has been performed using seven years (2001–2007) of Cluster data. Events both with and without high-speed earthward flows are included. A superposed epoch analysis of the data shows that the dipolarization is preceeded by a decrease of Bz before the increase. The duration of the dipolarization tends to ...

Angelopoulos, V.: The THEMIS mission, Space Sci. Rev., 141, 5–34, 2002.; Angelopoulos, V., Baumjohann, W., Kennel, C. F., Coroniti, R. V., Kivelson, M. G., Pellat, R., Walker, R. J., L{ü}hr, H., and Paschmann, G.: Bursty bulk flows in the inner central plasma sheet, J. Geophys. Res., 97, 4027–4039, 1992.; Baumjohann, W., Paschmann, G., and L{ü}hr, H.: Characteristics of high-speed flows in the plasma sheet, J. Geophys. Res., 95, 3801–3809, 1990.; Angelopoulos, V., Kennel...

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Magnetic Perturbations Seen by Champ and Evaluated Using the Tie-g...

By: M. Mandea; J. Cain; D. T. Mozzoni

Description: GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany. The Thermosphere-Ionosphere Electrodynamics General Circulation Model (TIE-GCM) is a self-consistent, global, atmospheric model that can be used to estimate magnetic perturbations at satellite altitude. These computed perturbations can then be compared with the magnetic vector data provided by low-earth orbiting satellites. In this initial study, the quietest day of each month from 20...

Cain, J. C., Mozzoni, D. T., Ferguson, B. B., and Ajayi, O.: Geomagnetic secular variation 1995–2000, J. Geophys. Res., 108(B3), 2161, doi:10.1029/2001JB001218, 2003.; Friis-Christensen, E., Lühr, H., and Hulot, G.: Swarm: A constellation to study the Earth's magnetic field, Earth Planets Space, 58, 351–358, 2006.; Hagan, M. E. and Forbes, J. M.: Migrating and nonmigrating diurnal tides in the middle and upper atmosphere excited by tropospheric latent heat release, J. Ge...

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Ozone Profile Smoothness as a Priori Information in the Inversion ...

By: H. Haario; V. F. Sofieva; J. Tamminen; E. Kyrölä; M. Lehtinen

Description: Finnish Meteorological Institute, Earth Observation, Helsinki, Finland. In this work we discuss inclusion of a priori information about the smoothness of atmospheric profiles in inversion algorithms. The smoothness requirement can be formulated in the form of Tikhonov-type regularization, where the smoothness of atmospheric profiles is considered as a constraint or in the form of Bayesian optimal estimation (maximum a posteriori method, MAP), where the ...

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Assessing the Phenomenology of the Cretan Sea Shelf Area Using Cou...

By: G. Petihakis; A. Pollani; G. Triantafyllou; A. Lascaratos; G. Korres

Description: Institute of Marine Biology of Crete, P.O.Box 2214, Iraklio, 71003 Crete, Greece. In this work the ability of nesting two hydrodynamical models, the high-resolution Cretan Sea shelf model and the lower resolution regional ALERMO model, was investigated. A new database was developed by objectively analysing raw climatological data from the MODB database enriched with in situ measurements collected by the Institute of Marine Biology of Crete. Prior t...

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Remote Sensing Observations of the Coherent and Non-coherent Ring ...

By: S. N. Bulgakov; R. C. Cruz Gómez

Description: Posgrado de Ciencias del Mar y Limnologia, Universidad Nacional Autonoma de Mexico, Mexico. The North Brazil Current Rings (NBCR) penetration into the Caribbean Sea is being investigated by employing a merged altimeter-derived sea height anomaly (TOPEX/Poseidon, Jason-1 and ERS-1, 2), the ocean surface color data (SeaWiFS) and Global Drifter Program information. Four strategies are being applied to process the data: (1) calculations of the Okubo-Weiss pa...

Andrade, C. A. and Barton, E. D.: Eddy development and motion in the Caribbean Sea, J. Geophys. Res., 105, 26 191–26 201, 2000.; Barnier, B., Reynaud, T., Beckmann, A., Boning, C., Molines, J.-M., Barnard, S., and Jia, Y.: On the seasonal variability and eddies in the North Brazil Current: Insight from model intercomparison experiments, Prog. Oceanogr., 44, 195–230, 2001.; Brigham, E. O.: The fast Fourier transform and its applications, Prentice Hall, 448 p., 1988.; Chal...

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One-step Ahead Prediction of FoF2 Using Time Series Forecasting Te...

By: A. Belehaki; K. Koutroumbas

Description: National Observatory of Athens, Institute for Space Applications and Remote Sensing, Metaxa and V. Pavlou, Palaia Penteli, 15 236, Athens, Greece. In this paper the problem of one-step ahead prediction of the critical frequency (foF2) of the middle-latitude ionosphere, using time series forecasting methods, is considered. The whole study is based on a sample of about 58000 observations of foF2 with 15-min time resolution, derived from the A...

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A Comparison of Velocity Measurements from the Cutlass Finland Rad...

By: S. E. Milan; T. K. Yeoman; M. Lester; J. A. Davies

Description: Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK. The CUTLASS Finland radar, which comprises an integral part of the SuperDARN system of HF coherent radars, provides near continuous observations of high-latitude plasma irregularities within a field-of-view which extends over some four million square kilometres. Within the Finland radar field-of-view lie both the EISCAT mainland and EISCAT Svalbard inc...

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Preface an Introduction to the 1St European Space Weather Week (Es...

By: A. Glover; A. Belehaki; H. Opgenoorth; A. Hilgers; F. Lefeuvre; B. Zolesi; J. Lilensten; M. Fuellekrug
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