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Is There a Plasma Density Gradient Role on the Generation of Short...

By: T. Ogawa; K. Schlegel; J. A. Koehler; C. Haldoupis; T. Ono

Description: Physics Department, University of Crete, Iraklion, 71003 Crete, Greece. The physics of the unstable E-region plasma is based on the modified two stream, or Farley-Buneman, and the gradient drift instabilities. The theory combines both mechanisms into a single dispersion relation which applies for the directly generated short-scale plasma waves, known as type 1 irregularities. In the absence of a plasma gradient it is only the two stream mechanism acting...

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The 22-year Cycle in the Geomagnetic 27-day Recurrences Reflecting...

By: D. Altadill; M. Todorova; E. M. Apostolov

Description: Observatorio del Ebro, (URL-CSIC), Horta Alta 38, E43520 Roquetes, Spain. Solar cycle variations of the amplitudes of the 27-day solar rotation period reflected in the geomagnetic activity index Ap, solar radio flux F10.7cm and critical frequency foF2 for mid-latitude ionosonde station Moscow from the maximum of sunspot cycle 18 to the maximum of cycle 23 are examined. The analysis shows that there are distinct enhancements of th...

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A Numerical Model of the Ionospheric Signatures of Time-varying Ma...

By: M. Lockwood; S. K. Morley

Description: School of Physics and Astronomy, University of Southampton, UK. A numerical model embodying the concepts of the Cowley-Lockwood (Cowley and Lockwood, 1992, 1997) paradigm has been used to produce a simple Cowley-Lockwood type expanding flow pattern and to calculate the resulting change in ion temperature. Cross-correlation, fixed threshold analysis and threshold relative to peak are used to determine the phase speed of the change in convection pattern,...

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Comment on Concerning the Generation of Geomagnetic Giant Pulsatio...

By: G. Chisham; I. R. Mann

Description: Department of Physics, University of York, York, UK. Not available.

Key words: Magnetospheric physics (energetic particles, trapped; MHD waves and instabilities) - Space plasma physics (wave-particle interactions)

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Letter to the Editor: Solar-cycle Variation of the Daily FoF2 and ...

By: P. A. Bradley; P. Dominici; S. S. Kouris

Description: Aristotle University of Thessaloniki, Department of Electrical Engineering and Computer Engineering, Telecommunications Division, GR-540 06 Thessaloniki, Greece. Daily values of the ionospheric characteristics foF2 and M(3000)F2 for a given hour and month are correlated with the corresponding daily values of sunspot number using measured data collected at seven European locations. The significance of applying different-order polynomials is conside...

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Storm Induced Large Scale Tids Observed in Gps Derived Tec : Volum...

By: N. Jakowski; V. Wilken; C. Borries

Description: DLR, Institute for Communication and Navigation, Kalkhorstweg 53, 17235 Neustrelitz, Germany. This work is a first statistical analysis of large scale traveling ionospheric disturbances (LSTID) in Europe using total electron content (TEC) data derived from GNSS measurements. The GNSS receiver network in Europe is dense enough to map the ionospheric perturbation TEC with high horizontal resolution. The derived perturbation TEC maps are analysed studying t...

Baran, L., Ephishov, I., and Shagimuratov, I.: Ionospheric Total Electron Content Behaviour During November 1997 Storm, Phys. Chem. Earth (C), 26, 341–345, 2001.; Afraimovich, E., Kosogorov, E., Leonovich, L., Palamartchouk, K., Perevalova, N., and Pirog, O.: Determining parameters of large-scale traveling ionospheric disturbances of auroral origin using GPS-arrays, J. Atmos. Solar-Terr. Phys., 62, 553–565, 2000.; Arbesser-Rastburg, B. and Jakowski, N.: Effects on Satell...

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Retrieving the Solar Euv Spectrum from a Reduced Set of Spectral L...

By: J. Aboudarham; J. Lilensten; M. Kretzschmar; T. Dudok De Wit; P.-o. Amblard

Description: LPCE, CNRS and University of Orléans, 3A avenue de la Recherche Scientifique, 45 071 Orléans cedex 2, France. The solar EUV irradiance is a key input for thermospheric and ionospheric models. Difficulties in continuously measuring the calibrated spectrum has prompted the use of various surrogate quantities. Although most proxies correlate quite well with the spectral variability, their use for modelling purposes becomes increasingly unsatisfactory. A dif...

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Coordinated Cluster/Double Star and Ground-based Observations of D...

By: C. P. Nielsen; Z.-j. Hu; I. W. McCrea; Q.-h. Zhang; M. Lester; H.-q. Hu; Y. V. Bogdanova; M. W. Dunlop; B.-c. Zhang; H.-g. Yang; R.-y. Liu; S. R. Crothers; C. La Hoz

Description: SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai, China. A number of flux transfer events (FTEs) were observed between 09:00 and 12:00 UT on 11 February 2004, during southward and dawnward IMF, while the Cluster spacecraft array moved outbound through the northern, high-altitude cusp and dayside high-latitude boundary layer, and the Double Star TC-1 spacecraft was crossing the dayside low-latitude magnetopause into the m...

Amm, O., Donovan, E. F., Frey, H., Lester, M., Nakamura, R., Wild, J. A., Aikio, A., Dunlop, M., Kauristie, K., Marchaudon, A., McCrea, I. W., Opgenoorth, H.-J., and Strømme, A.: Coordinated studies of the geospace environment using Cluster, satellite and ground-based data: an interim review, Ann. Geophys., 23, 2129–2170, doi:10.5194/angeo-23-2129-2005, 2005.; Berchem, J. and Russell, C. T.: Flux transfer events on...

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Temporal and Spatial Variations in Tec Using Simultaneous Measurem...

By: D. S. V. V. D. Prasad; S. Gopi Krishna; K. Niranjan; P. V. S. Rama Rao

Description: Space Physics Laboratory, Department of Physics, Andhra University, Visakhapatnam 530003, India. With the recent increase in the satellite-based navigation applications, the ionospheric total electron content (TEC) and the L-band scintillation measurements have gained significant importance. In this paper we present the temporal and spatial variations in TEC derived from the simultaneous and continuous measurements made, for the first time, using the Ind...

Ackroyd, N. and Lorimer, R.: A GPS User's Guide, Lloyd's of London Press, 1990.; Coco, D.: GPS – Satellites of Opportunity for Ionospheric Monitoring, GPS World, 47, 1991.; Chandra, H. and Rastogi, R. G.: Geomagnetic storm effects on Ionospheric drifts and the equatorial E over the magnetic equator, Indian Journal of Radio and Space Physics, 3, 332–336, 1974.; Dasgupta, A. and Basu, A.: Investigation of ionospheric electron content in the equatorial region as obtained by...

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New Method in Computer Simulations of Electron and Ion Densities a...

By: A. V. Pavlov

Description: Institute of Terrestrial Magnetism, Ionosphere and Radio-Wave Propagation, Russia Academy of Science (IZMIRAN), Troitsk, Moscow Region, 142190, Russia. A new theoretical model of the Earth’s low- and mid-latitude ionosphere and plasmasphere has been developed. The new model uses a new method in ionospheric and plasmaspheric simulations which is a combination of the Eulerian and Lagrangian approaches in model simulations. The electron and ion continui...

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Thermospheric Vertical Winds in the Auroral Oval/Polar Cap Region ...

By: P. A. Greet; J. L. Innis; P. L. Dyson

Description: Australian Antarctic Division, Kingston, Tasmania, 7050, Australia. Thermospheric mean vertical winds from high-resolution Fabry-Perot Spectrometer observations of the l630 nm emission (from ~ 240 km altitude), over a four year interval 1997–2000, from Mawson (67.6° S, 62.9° E, Inv 70.5° S) and Davis (68.6° S, 78.0° E, Inv 74.6° S) are presented. Combining the four years of data shows Mawson mean hourly vertical winds vary ...

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Oxygen Ion Energization Observed at High Altitudes : Volume 28, Is...

By: M. André; G. Stenberg; M. Waara; H. Nilsson; H. Rème; H. Gunell

Description: Swedish Institute of Space Physics, Kiruna, Sweden. We present a case study of significant heating (up to 8 keV) perpendicular to the geomagnetic field of outflowing oxygen ions at high altitude (12 RE) above the polar cap. The shape of the distribution functions indicates that most of the heating occurs locally (within 0.2–0.4 RE in altitude). This is a clear example of local ion energization at much higher altitude t...

André, M. and Yau, A. W.: Theories and observations of ion energization and outflow in the high latitude magnetosphere, Space Sci. Rev., 80, 27–48, 1997.; Andr{é}, M., Norqvist, P., Andersson, L., Eliasson, L., Eriksson, A. I., Blomberg, L., Erlandson, R. E., and Waldemark, J.: Ion energization mechanisms at 1700 km in the auroral region, J. Geophys. Res., 103, 4199–4222, doi:10.1029/97JA00855, 1998.; Arvelius, S., Yamauchi...

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Modes of Zonal Mean Temperature Variability 20–100 Km from the Tim...

By: Z. Sheng; H. Q. Shi; Y. Jiang

Description: College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing, 211101, China. In this study we investigate the spatial variabilities of the zonal mean temperature (20–100 km) from the TIMED (Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics)/SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) satellite using the empirical orthogonal functions (EOFs). After removing the climatological annual mean...

Beig, G.: Review of mesospheric temperature trends, Rev. Geophys., 41, 1015, doi:10.1029/2002rg000121, 2003.; Chu, P. C., Lu, S., and Chen, Y.: Temporal and spatial variabilities of the South China Sea surface temperature anomaly, J. Geophys. Res., 102, 20937–20955, 1997.; Chu, P. C., Chen, Y., and Lu, S.: Temporal and Spatial Variabilities of Japan Sea Surface Temperature and Atmospheric Forcings, J. Oceanogr., 54, 273–...

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The Storm Time Central Plasma Sheet : Volume 20, Issue 11 (30/11/-...

By: R. Nakamura; W. Baumjohann; K. Dierschke; T. Mukai; R. Schödel

Description: Max-Planck-Institut für extraterrestrische Physik, Garching, Germany. The plasma sheet plays a key role during magnetic storms because it is the bottleneck through which large amounts of magnetic flux that have been eroded from the dayside magnetopause have to be returned to the dayside magnetosphere. Using about five years of Geotail data we studied the average properties of the near- and midtail central plasma sheet (CPS) in the 10–30 RE<...

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Analytic Models for a Spherical Satellite Charging in Sunlight at ...

By: M. Tautz; S. T. Lai

Description: AER/Radex Inc., Bedford , MA 01730, USA. We present analytic models for the steady state potential distributions surrounding a spinning, dielectric-coated, spherical spacecraft charging in sunlight. The sun direction is assumed to lie in the satellite bellyband plane, perpendicular to the spin axes. The models are based on a multipole expansion of Laplacian potentials external to the spacecraft surface. The combination of monopole potentials along with ...

Besse, A. and Rubin, A.: A simple analysis of spacecraft charging involving blocked photoelectron currents, J. Geophys. Res., 85(A5), 2324–2328, 1980.; Beyer, W. H. (Ed.): Standard Mathematical Tables and Formulae, CRC Press, Boston, 1973.; Feuenbacher, B. and Fitton, B.: Experimental investigation of photoemission from satellite surface materials, J. Appl. Phys., 43, 1563, 1972.; Hinteregger, H. E., Damon, K. R., and Hall, L. A.: Analysis of photoelectrons from solar ex...

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Rosetta and Mars Express Observations of the Influence of High Sol...

By: N. J. T. Edberg; F. Duru; J. G. Trotignon; C. M. Carr; K.-h. Glassmeier; D. A. Brain; S. W. H. Cowley; E. Cupido; J. L. Burch; M. Samara; S. Barabash; U. Auster; I. Richter; A. Bößwetter; R. Goldstein; M. Lester; M. Fränz; A. I. Eriksson; R. Lundin; H. Nilsson; R. Modolo

Description: Department of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, UK. We report on new simultaneous in-situ observations at Mars from Rosetta and Mars Express (MEX) on how the Martian plasma environment is affected by high pressure solar wind. A significant sharp increase in solar wind density, magnetic field strength and turbulence followed by a gradual increase in solar wind velocity is observed during ~24 h in the combined data set from ...

Barabash, S., Lundin, R., Andersson, H., Brinkfeldt, K., Grigoriev, A., Gunell, H., Holmstr{ö}m, M., Yamauchi, M., Asamura, K., Bochsler, P., Wurz, P., Cerulli-Irelli, R., Mura, A., Milillo, A., Maggi, M., Orsini, S., Coates, A. J., Linder, D. R., Kataria, D. O., Curtis, C. C., Hsieh, K. C., Sandel, B. R., Frahm, R. A., Sharber, J. R., Winningham, J. D., Grande, M., Kallio, E., Koskinen, H., Riihel{ä}, P., Schmidt, W., S{ä}les, T., Kozyra, J. U., Krupp, N., Woch, J., Liv...

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