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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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The Heliospheric Modulation of Cosmic Ray Boron and Carbon : Volum...

By: U. W. Langner; M. S. Potgieter

Description: School of Physics, North-West University, 2520 Potchefstroom, South Africa. The observed boron to carbon ratio (B/C) at Earth provides a good measure of the overall secondary to primary ratio of galactic cosmic rays. This makes B/C an important constraint and test for the validity and general applicability of theoretical and numerical models of galactic propagation and heliospheric modulation. For this purpose, the modulation of boron and carbon in the ...

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Ion Dynamics in Electron Beam–plasma Interaction: Particle-in-cell...

By: K. Baumgärtel

Description: Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany. Electron beam–plasma interaction including ions is studied by particle-in-cell (PIC) simulations using a one-dimensional, electrostatic code. Evidence for Langmuir wave decay is given for sufficiently energetic beams, as in previous Vlasov–Maxwell simulations. The mechanism for the generation of localized finite-amplitude ion density fluctuations is analyzed. Amplitu...

Akimoto, K., Omura, Y., and Natsumoto, H.: Rapid generation of Langmuir wave packets during electron beam–plasma instabilities, Phys. Plasmas, 3, 2559–2563, 1996.; Cairns, I. H. and Melrose, D. B.: A theory for the 2fp radiation upstream of Earths bow shock, J. Geophys. Res., 90, 6637–6640, 1985.; Bale, S. D., Burgess, D., Kellog, P. I., Goetz, K., Howard, R. L., and Monson, S. J.: Phase coupling in Langmuir wave packets: Possible evidence of three–wave interactions in t...

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Impact of the Southeast Asian Summer Monsoon Strength on the Outfl...

By: J. Li; H. Liao; L. Zhang

Description: State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmosphere Physics, Chinese Academy of Sciences, Beijing 100029, China. We chose a relatively weak Southeast Asian summer monsoon (SEASM) year (1998) and a relatively strong year (2002) to examine the impact of the monsoon strength on the transport of organic carbon (OC) aerosol emitted from the South Asia (75°–105° E, 10°–25° N) by using the global 3...

Li, J. and Zeng, Q.: A new monsoon index and the geographical distribution of the global monsoons, Adv. Atmos. Sci., 20, 299–302, 2003.; Alexander, B., Savarino, J., Lee, C. C. W., Park, R. J., Jacob, D. J., Thiemens, M. H., Li, Q. B., and Yantosca, R. M.: Sulfate formation in sea-salt aerosols: Constraints from oxygen isotopes, J. Geophys. Res., 110, D10307, doi:10.1029/2004JD005659, 2005.; Andreae, M. O., Berresheim, H., Andreae, T. W., Kritz, M. A., Bates, T. S., and ...

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The Ecoma 2007 Campaign: Rocket Observations and Numerical Modelli...

By: U.-p. Hoppe; K. Svenes; Ø. Lie-svendsen; M. Rapp; R. Latteck; I. Strelnikova; A. Brattli; M. Friedrich

Description: Norwegian Defence Research Establishment (FFI), P.O. Box 25, 2027 Kjeller, Norway. The ECOMA series of rocket payloads use a set of aerosol particle, plasma, and optical instruments to study the properties of aerosol particles and their interaction with the ambient plasma environment in the polar mesopause region. In August 2007 the ECOMA-3 payload was launched into a region with Polar Mesosphere Summer Echoes (PMSE) and noctilucent clouds (NLC). An ...

Balsiger, F., Kopp, E., Friedrich, M., Torkar, K M., Wälchli, U., and Witt, G.: Positive ion depletion in a noctilucent cloud, Geophys. Res. Lett., 23, 93–96, 1996.; Baumgarten, G. and Fiedler, J.: Vertical structure of particle properties and water content in noctilucent clouds, Geophys. Res. Lett., 35, L10811, \doi10.1029/2007GL033084, 2008.; Baumgarten, G.,~Fiedler, J.,~Fricke, K H., et~al.: The noctilucent cloud (NLC) display during the ECOMA/MASS sounding rocket fli...

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Mesospheric Dust and Its Secondary Effects as Observed by the Espr...

By: L. H. Surdal; C. R. Philbrick; O. Havnes

Description: Department of Physics and Technology, University of Tromsø, Tromsø, Norway. The dust detector on the ESPRIT rocket detected two extended dust/aerosol layers during the launch on 1 July 2006. The lower layer at height ~81.5–83 km coincided with a strong NLC and PMSE layer. The maximum dust charge density was ~−3.5×109 e m−3 and the dust layer was characterized by a few strong dust layers where the dust charge density at the upper e...

Havnes, O. and Kassa, M.: On the sizes and observable effects of dust particles i PMWE, J. Geophys. Res., accepted, doi:2008JD011276, 2009. \bibitem[] Havnes, O. and Næsheim, L. I.: On the secondary charging effects and structure of mesospheric dust particles impacting on rocket probes, Ann. Geophys., 25, 623–637, 2007. \bibitem[] Havnes, O., de Angelis, U., Bingham, R., Goertz, C. K., Morfill, G. E., and Tsytovich, V.: On the role of dust in the summer mesopause, J. Atm...

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Schumann Resonance Frequency Variations Observed in Magnetotelluri...

By: J. Rai; M. Israil; R. Chand

Description: Department of Earth Sciences, Indian Institute of Technology, Roorkee 247 667, India. Schumann resonance (SR) frequency variation has been studied using Magnetotelluric (MT) data recorded in one of the world's toughest and generally inaccessible Himalayan terrain for the first time in the author's knowledge. The magnetotelluric data, in the form of orthogonal time varying electric and magnetic field components (Ex, Ey...

Greifinger, C. and Greifinger, P.: Approximate method for determining ELF eigenvalues in the earth-ionosphere waveguide, Radio Sci., 13, 831–837, 1978.; Balser, M. and Wagner, C. A.: Diurnal power variations of the Earth-ionosphere cavity modes and their relationship to world-wide thunderstorm activity, J. Geophys. Res., 67, 619–625, 1962.; Beamish, D. and Tzanis, A.: High resolution spectral characteristics of the Earth-ionosphere cavity resonances, J. Atmos. Terr. Phys...

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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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Space Weather and Dangerous Phenomena on the Earth: Principles of ...

By: L. I. Dorman

Description: Israel Cosmic Ray and Space Weather Center and Emilio Segre’ Observatory, affiliated to Tel Aviv University, Technion and Israel Space Agency, P. O. Box 2217, Qazrin 12900, Israel. According to NOAA space weather scales, geomagnetic storms of scales G5 (3-h index of geomagnetic activity Kp=9), G4 (Kp=8) and G3 (Kp=7) are dangerous for satellites, aircrafts, and even for technology on the ground (influe...

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Magnetopause Current as Seen by Cluster : Volume 23, Issue 3 (30/0...

By: A. Balogh; M. W. Dunlop

Description: SSTD, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UK. The four-spacecraft, magnetic field measurements on Cluster can be combined to produce an accurate determination of the electric current in the magnetopause boundary during stable magnetopause crossings. For events that are planar on the scale of the spacecraft configuration, the thickness of the current layer can be accurately estimated from its magnetic profile at each spacecra...

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Mesospheric Energy Loss Rates by Oh and O2 Emissions at 23°S : Vol...

By: Y. Sahai; H. Takahashi; D. Gobbi; P. R. Fagundes

Description: Instituto Nacional de Pesquisas Espaciais-INPE-C.P. 515-12.201-970-São José des Campos, SP, Brazil; e-mail: fagundes@fislume.laser.impe.br. The nightglow OH(9, 4) and O2 atmospheric (0,1) band emission intensities and their rotational temperatures T(OH) and T(O2), respectively, observed at Cachoeira Paulista (23°S, 45°W), Brazil, during the period from October 1989 to December 1990, have been analyzed to study ...

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Long-term Response of Stratospheric Ozone and Temperature to Solar...

By: F. Berrilli; E. Pietropaolo; I. Bordi

Description: Department of Physics, Sapienza University of Rome, Rome, Italy. The long-term variability in stratospheric ozone mass mixing ratio (O3) and temperature (T) from 1979 to 2013 is investigated using the latest reanalysis product delivered by the European Centre for Medium-Range Weather Forecasts (ECMWF), i.e., ERA-Interim. Moreover, using the Mg II index time series for the same time period, the response of the stratosphere to the 11-yea...

Berrilli, F., Scardigli, S., and Giordano, S.: Multiscale Magnetic Underdense Regions on the Solar Surface: Granular and Mesogranular Scales, Solar Phys., 282, 379–387, 2013.; Berrilli, F., Casolino, M., Del Moro, D., Di Fino, L., Larosa, M., Narici, L., Piazzesi, R., Picozza, P., Scardigli, S., Sparvoli, R., Stangalini, M., Zaconte, V.: The relativistic solar particle event of May 17th, 2012 observed on board the International Space Station, J. Space Weather Space Clim....

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Ion Upflow and Downflow at the Topside Ionosphere Observed by the ...

By: Y. Ogawa; S. C. Buchert; R. Fujii; S. Watanabe; N. Yoshida; S. Nozawa; M. Endo

Description: Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan. We have determined the MLT distribution and KP dependence of the ion upflow and downflow of the thermal bulk oxygen ion population based on a data analysis using the EISCAT VHF radar CP-7 data obtained at Tromsø during the period between 1990 and 1996: (1) both ion upflow and downflow events can be observed at any local time (MLT),...

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Application of Generalized Singular Value Decomposition to Ionosph...

By: P. K. Bhuyan; S. B. Singh; K. Bhuyan

Description: Department of Physics, Dibrugarh University 786004, India. The electron density distribution of the low- and mid-latitude ionosphere has been investigated by the computerized tomography technique using a Generalized Singular Value Decomposition (GSVD) based algorithm. Model ionospheric total electron content (TEC) data obtained from the International Reference Ionosphere 2001 and slant relative TEC data measured at a chain of three stations receiving tr...

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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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Letter to the Editor Uhf Electromagnetic Emission Stimulated by Hf...

By: S. D. Snegirev; V. M. Fridman; T. S. Podstrigach; L. M. Lifshits; S. M. Grach; E. N. Sergeev

Description: State University of Nizhny Novgorod, Gagarina av. 23, Nizhny Novgorod, 603950, Russia. UHF electromagnetic emission (with a frequency near 600 MHz) from the F-region of the ionosphere pumped by an HF powerful radio wave is revealed. Possible mechanisms of the emission excitation, such as plasma mode con-version, scattering or Earth thermal noise emission off the plasma density irregularities, bremsstrahlung and excitation of high Rydberg states of ...

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Near-earth Magnetic Signature of Magnetospheric Substorms and an I...

By: P. Ritter; H. Lühr

Description: Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum – GFZ, Telegrafenberg, 14473 Potsdam, Germany. Based on a comprehensive catalogue with more than 4000 magnetospheric substorm entries from the years 2000–2005, the spatial distribution of the substorm-related magnetic signatures at mid and low latitudes around local midnight was investigated. Superposed epoch analysis of a larger number of recent observatory data from mid and low latitudes revealed...

Antonova, E E.: Magnetostatic equilibrium and current systems in the Earth's magnetosphere, Adv. Space Res., 33, 757–760, 2004.; Caan, M N., McPherron, R L., and Russell, C T.: Substorm and interplanetary magnetic field effects on the geomagnetic tail lobes, J. Geophys. Res., 80, 191–194, 1975.; Baker, D N., Pulkkinen, T I., Angelopoulos, V., Baumjohann, W., and McPherron, R L.: Neutral line model of substorms: Past results and present view, J. Geophys. Res., 101, 12 975...

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Conditions for Substorm Onset by the Fast Reconnection Mechanism :...

By: M. Ugai

Description: Research Center for Space and Cosmic Evolution, Ehime University, Matsuyama 790-8577, Japan. The fast reconnection mechanism, involving slow shocks and Alfvénic fast plasma jets, is most responsible for the explosive conversion of magnetic energy associated with geomagnetic substorms and solar flares. In this paper, the spontaneous fast reconnection model is applied to well-known phenomena of substorms. When the east-west width of the tail current s...

Daughton, W., Scudder, J., and Karimabadi, H.: Fully kinetic simulations of undriven magnetic reconnection with open boundary conditions, Phys. Plasmas, 13, 072101, 2006.; Isobe, H., Miyagoshi, T., Shibata, K., and Yokoyama, T.: Filamentary structure on the sun from the magnetic Rayleigh-Taylor instability, Nature, 434, 478–481, 2005.; Janhunen, P. and Palmroth, M.: Some observational phenomena are well reproduced by our global MHD while others are not: Remarks on what, ...

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Vhf Radar Observation of Atmospheric Winds, Associated Shears and ...

By: K. Kishore Kumar; V. Siva Kumar; A. R. Jain; A. K. Ghosh

Description: National MST Radar Facility, P. B. No.-123, Tirupati 517 502, India. The turbulence refractivity structure constant (C2n ) is an important parameter of the atmosphere. VHF radars have been used extensively for the measurements of C2n. Presently, most of such observations are from mid and high latitudes and only very limited observations are available for equatorial and tropical latitudes. Indian MST r...

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Daytime Sodium Airglow Emission Measurements Over Trivandrum Using...

By: C. Vineeth; T. K. Pant; S. G. Sumod; M. M. Hossain; R. Sridharan

Description: Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum 695022, India. This paper presents measurement of daytime Sodium (Na) airglow emissions at 589.6 nm wavelength using a ground based 1-m scanning monochromator from Trivandrum (8.5° N, 77° E, 0.5° N dip latitude), a near-equatorial station in India. The Na emission intensity exhibits significant temporal variability within a day and from one day to another. The Na intensity has been compa...

Chapman, S.: Notes on atmospheric sodium, J. Astrophys., 90, 309–316, 1939.; Bates, D. R. and Moiseiwitsch, B. L.: Origin of the Meinel hydroxyl system in the night airglow, J. Atmos. Terr. Phys., 8(6), 305–308, 1956.; Blamont, J. E.: The dayglow of the sodium D lines, J. Geophys. Res., 66(5), 1407–1423, 1961.; Burnett, C. R., Lasher, R. W., Miskin, A. S., and Sides, V. L.: Spectroscopic Measurement of Sodium Dayglow: Absence of a Large Diurnal Variation, J. Geophys. Res...

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