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Estimates of Magnetic Cloud Expansion at 1 Au : Volume 26, Issue 7...

By: C.-c. Wu; T. Ferguson; D. B. Berdichevsky; R. P. Lepping

Description: Space Weather Laboratory, NASA-Goddard Space Flight Center, Greenbelt, MD 20771, USA. In this study we analyze 53 magnetic clouds (MCs) of standard profiles observed in WIND magnetic field and plasma data, in order to estimate the speed of MC expansion (VE) at 1 AU, where the expansion is investigated only for the component perpendicular to the MCs' axes. A high percentage, 83%, of the good and acceptable quality cases of MCs (N(good)=...

Berdichevsky, D. B., Lepping, R. P., and Farrugia, C. J.: Geometric considerations of the evolution of magnetic flux ropes, Phys. Rev. E, 67, 036405, 2003.; Bothmer, V. and Schwenn, R. H.: Eruptive prominences as sources of magnetic clouds in the solar wind, Space Sci. Rev., 70, 215–220, 1994.; Burlaga, L. F.: Magnetic clouds: Constant alpha force-free configurations, J. Geophys. Res., 93, 7217–7224, 1988.; Burlaga, L. F.: Interplanetary Magnetohydrodynamics, Oxford Univ...

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Planetary Period Oscillations in Saturn's Magnetosphere: Comments ...

By: G. Provan; S. W. H. Cowley

Description: Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK. We discuss the properties of Saturn planetary period oscillations (PPOs) deduced from analysis of Saturn kilometric radiation (SKR) modulations by Fischer et al. (2014), and from prior analysis of magnetic field oscillations data by Andrews et al. (2012) and Provan et al. (2013), with emphasis on the post-equinox interval from early 2010 to early 2013. Fischer et al. (...

Andrews, D. J., Bunce, E. J., Cowley, S. W. H., Dougherty, M. K., Provan, G., and Southwood D. J.: Planetary period oscillations in Saturn's magnetosphere: Phase relation of equatorial magnetic field oscillations and SKR modulation, J. Geophys. Res., 113, A09205, doi:10.1029/2007JA012937, 2008.; Andrews, D. J., Cowley, S. W. H., Dougherty, M. K., and Provan, G.: Magnetic field oscillations near the planetary period in Sa...

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Corrigendum to Downward Auroral Currents from the Reconnection Hal...

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

Description: Department of Geophysics and Environmental Sciences, Munich University, Munich, Germany. No abstract available.

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The Present-day and Future Impact of NoX Emissions from Subsonic A...

By: G. J. M. Velders; P. J. M. Valks

Description: National Institute of Public Health and the Environment, Air Research Laboratory, PO Box 1, 3720 BA Bilthoven, The Netherlands. The effect of present-day and future NOx emissions from aircraft on the NOx and ozone concentrations in the atmosphere and the corresponding radiative forcing were studied using a three-dimensional chemistry transport model (CTM) and a radiative model. The effects of the aircraft emissions were compared wit...

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A Global Mhd Simulation of an Event with a Quasi-steady Northward ...

By: K. Papadopoulos; B. J. Anderson; J. G. Lyon; H. Korth; C. C. Goodrich; V. G. Merkin

Description: Center for Space Physics, Boston University, Boston, MA, USA. We show results of the Lyon-Fedder-Mobarry (LFM) global MHD simulations of an event previously examined using Iridium spacecraft observations as well as DMSP and IMAGE FUV data. The event is chosen for the steady northward IMF sustained over a three-hour period during 16 July 2000. The Iridium observations showed very weak or absent Region 2 currents in the ionosphere, which makes the ev...

Anderson, B J., Takahashi, K., and Toth, B A.: Sensing global Birkeland currents with Iridium$^\mbox\textregistered$ engineering magnetometer data, Geophys. Res. Lett., 27, 4045–4048, 2000.; Anderson, B J., Takahashi, K., Kamei, T., Waters, C L., and Toth, B A.: Birkeland current system key parameters derived from Iridium observations: Method and initial vaidation results, J. Geophys. Res., 107, 1079, doi:10.1029/2001JA000080, 2002.; Backus, G.: Poloidal and toroidal fie...

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Cellular Automata Model of Magnetospheric-ionospheric Coupling : V...

By: T. V. Kozelova; B. V. Kozelov

Description: Polar Geophysical Institute, Apatity, Murmansk Region, 184209, Russia. We propose a cellular automata model (CAM) to describe the substorm activity of the magnetospheric-ionospheric system. The state of each cell in the model is described by two numbers that correspond to the energy content in a region of the current sheet in the magnetospheric tail and to the conductivity of the ionospheric domain that is magnetically connected with this region. T...

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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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Evidence on a Link Between the Intensity of Schumann Resonance and...

By: Y. Hobara; A. P. Nickolaenko; M. Hayakawa; M. Sekiguchi

Description: The University of Electro-Communications, Department of Electronic Engineering, Chofu, Tokyo, Japan. A correlation is investigated between the intensity of the global electromagnetic oscillations (Schumann resonance) with the planetary surface temperature. The electromagnetic signal was monitored at Moshiri (Japan), and temperature data were taken from surface meteorological observations. The series covers the period from November 1998 to May 2002. The ...

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The Turbopause Experiment: Atmospheric Stability and Turbulent Str...

By: S. G. Bilén; M. F. Larsen; G. A. Lehmacher; M. Rapp; C. L. Croskey; T. D. Scott; F.-j. Lübken; R. L. Collins; J. D. Mitchell

Description: Department of Physics & Astronomy, Clemson University, Clemson, SC, USA. Very few sequences of high resolution wind and temperature measurements in the lower thermosphere are available in the literature, which makes it difficult to verify the simulation results of models that would provide better understanding of the complex dynamics of the region. To address this problem the Turbopause experiment used four rockets launched over a period of approximatel...

Achatz, U.: Gravity-wave breaking: Linear and primary nonlinear dynamics, Adv. Space Res., 40, 719–733, 2007.; Blamont, J. E.: Turbulence in the atmospheric motions between 90 and 130 km of altitude, Planet. Space Sci., 10, 89–101, 1963.; Bishop, R. L., Larsen, M. F., Hecht, J. H., Liu, A. Z., and Gardner, C. S.: TOMEX: Mesospheric and lower thermospheric diffusivities and instability layers, J. Geophys. Res., 109, D02S03, d...

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Aspi Experiment: Measurements of Fields and Waves on Board the Int...

By: J. Juchniewicz; G. Bellucci; E. Amata; F. Farnik; H. Lehmann; U. De Angelis; A. Best; J. L. Rauch; P. Gough; S. Romanov; S. Klimov; S. Orsini; J. Vojta; J. Blecki; L. J. C. Woolliscroft; J. Rustenbach; J. Büchner; V. Formisano; Yu. Afanas'Yev; J. Slominski; A. Petrukovich; J. G. Trotignon; R. Wronowski; M. Nozdrachev; P. Triska; A. Skalsky; U. Auster; V. Korepanov; V. Grushin; R. Grard; M. Parrot; V. Ivchenko; S. Savin; K. Sauer; G. Haerendel; B. Nikutowski

Description: Space Research Institute, Russian Academy of Sciences, Moscow, Russia. The plasma-wave experiment ASPI (analysis of spectra of plasma waves and instabilities) on board the INTERBALL spacecraft is a combined wave diagnostics experiment. It performs measurements of the DC and AC magnetic field vector by flux-gate and search-coil sensors, the DC and AC electric field vector by Langmuir double probes and the plasma current by Langmuir split probe. Prelimina...

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Geotail Observations of Fte Velocities : Volume 27, Issue 1 (06/01...

By: T. Rosenberg; D. G. Sibeck; G. I. Korotova

Description: IZMIRAN, Troitsk, Moscow Region 142190, Russia. We discuss the plasma velocity signatures expected in association with flux transfer events (FTEs). Events moving faster than or opposite the ambient media should generate bipolar inward/outward (outward/inward) flow perturbations normal to the nominal magnetopause in the magnetosphere (magnetosheath). Flow perturbations directly upstream and downstream from the events should be in the direction of event m...

Belcher, J. W. and Davis Jr., L.: Large-amplitude Alfvén waves in the interplanetary medium, 2., J. Geophys. Res., 76, 3534–3563, 1971.; Cooling, B. M. A., Owen, C. J., and Schwartz, S. J.: Role of the magnetosheath flow in determining the motion of open flux tubes, J. Geophys. Res., 106, 18 763–18 775, 2001.; Cowley, S. W. H.: The causes of convection in the Earth's magnetosphere: A review of developments during the IMS, Rev. Geophys. Space Phys., 20, 531–565, 1982.; Di...

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The Effects of Mesoscale Regions of Precipitation on the Ionospher...

By: J.-m. A. Noël; J.-p. St.-maurice; J. D. De Boer

Description: Department of Physics, Royal Military College of Canada, Kingston, Ontario, Canada. We have developed a new high resolution two-dimensional model of the high latitude ionosphere in which nonlinear advection terms are closely coupled with the electrodynamics. The model provides a self-consistent description of the ionospheric feedback on the electrodynamical perturbations produced by auroral arc-related particle precipitation in regions with strong ambien...

Amm, O., Aruliah, A., Buchert, S. C., Fujii, R., Gjerloev, J. W., Ieda, A., Matsuo, T., Stolle, C., Vanhamäki, H., and Yoshikawa, A.: Towards understanding the electrodynamics of the 3-dimensional high-latitude ionosphere: present and future, Ann. Geophys., 26, 3913–3932, doi:10.5194/angeo-26-3913-2008, 2008.; Blelly, P.-L. and Schunk, R. W.: A comparative study of the time-dependent standard, 8-, 13- and 16-moment transport formulations of the polar wind, Ann. Geophys.,...

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Satellite-based Analysis of Thermosphere Response to Extreme Solar...

By: H. Lammer; M. Pfleger; S. Krauss

Description: Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042 Graz, Austria. We present a refined algorithm to calculate pseudo solar indices, which enable the reproduction of a solar flare impact on the upper Earth's atmosphere for the empirical thermosphere model Jacchia-Bowman 2008. In a first step we compare the estimates of the new algorithm with those from a previous study by analysing an extreme X17.2 flare in 2003 using TIMED/SEE ...

Bowman, B. R., Tobiska, W. K., Marcos, F. A., Huang, C. Y., Lin, C. S., and Burke, W. J.: A New Empirical Thermospheric Density Model JB2008 Using New Solar and Geomagnetic Indices, AIAA/AAS Astrodynamics Specialist Conference, AIAA 2008-6438, 2008.; Krauss, S.: Response of the Earth's thermosphere during extreme solar events. A contribution of satellite observations to atmospheric evolution studies, PhD. thesis, Graz University of Technology, 2013.; Krauss, S., Fichting...

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Optical Observations Geomagnetically Conjugate to Sprite-producing...

By: J. Bór; T. Neubert; A. Hughes; G. Sátori; R. A. Marshall; A. Collier; U. S. Inan; T. H. Allin

Description: STARLab, Stanford University, Stanford, CA, USA. Theoretical studies have predicted that large positive cloud-to-ground discharges can trigger a runaway avalanche process of relativistic electrons, forming a geomagnetically trapped electron beam. The beam may undergo pitch angle and energy scattering during its traverse of the Earth's magnetosphere, with a small percentage of electrons remaining in the loss cone and precipitating in the magnetically co...

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Seasonal Variabilities of Low-latitude Mesospheric Winds : Volume ...

By: S. Gurubaran; R. Rajaram

Description: Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Krishnapuram, Tirunelveli 627 011, India. Observations of mesospheric winds over a period of four years with the partial reflection radar at Tirunelveli (8.7°N, 77.8°E), India, are presented in this study. The emphasis is on describing seasonal variabilities in mean zonal and meridional winds in the altitude region 70–98 km. The meridional winds exhibit overall transequatorial ...

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The Dawn and Dusk Electrojet Response to Substorm Onset : Volume 1...

By: H. J. Opgenoorth; P. Stauning; E. Donovan; P. Eglitis; E. Borälv; G. Reeves

Description: Swedish Institute of Space Physics, Box 537, S-751 21 Uppsala, Sweden. We have investigated the time delay between substorm onset and related reactions in the dawn and dusk ionospheric electrojets, clearly separated from the nightside located substorm current wedge by several hours in MLT. We looked for substorm onsets occurring over Greenland, where the onset was identified by a LANL satellite and DMI magnetometers located on Greenland. With this setup...

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Phenomena Induced by Powerful Hf Pumping Towards Magnetic Zenith w...

By: T. K. Yeoman; V. A. Kornienko; T. D. Borisova; N. F. Blagoveshchenskaya; H. C. Carlson; A. Brekke; M. T. Rietveld

Description: Arctic and Antarctic Research Institute, St. Petersburg, Russia. Multi-instrument observational data from an experiment on 13 October 2006 at the EISCAT/HEATING facility at Tromsø, Norway are analysed. The experiment was carried out in the evening hours when the electron density in the F-region dropped, and the HF pump frequency fH was near and then above the critical frequency of the F2 layer. The distinctive feature of this experimen...

Ashrafi, M., Kosch, M. J., and Honary, F.: Heater-induced altitude descent of the EISCAT UHF ion line enhancements: Observations and modelling, Adv. Space Res., 38, 2645–2652, 2006.; Ashrafi, M., Kosch, M. J., Kaila, K., and Isham, B.: Spatiotemporal evolution of radio wave pump-indiced ionospheric phenomena near the fourth electron gyroharmonic, J. Geophys. Res., 112, A05314, doi:10.1029/2006JA011938, 2007.; Bernhardt, P., Tepley, C., and Duncan, L.: Airglow enhancement...

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Quantifying the Coupling Degree Between Land Surface and the Atmos...

By: Ch. Bernhofer; V. Goldberg

Description: Dresden University of Technology, Institute for Hydrology and Meteorology, Department of Meteorology, Pienner Str. 9, 01737 Tharandt, Germany. In the present study, the ability of different indices to quantify the coupling degree between a vegetated surface and the atmospheric boundary layer is tested. For this purpose, a one-and-a-half dimensional atmospheric boundary layer model, including a high resolved vegetation canopy, was applied (HIRVAC) and ind...

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