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Energetic Particles Observed by Isee-1 and Isee-2 in a Cusp Diamag...

By: J. Chen; N. M. Lender; T. A. Fritz; K. E. Whitaker; B. M. Walsh

Description: Center for Space Physics, Boston University, Boston, Massachusetts, USA. Observations by the ISEE-1 and ISEE-2 spacecraft on 29 September 1978 show large CEP (Cusp Energetic Particle) fluxes while passing through the dayside magnetospheric cusp in near coincident orbits. The event was observed around 11:00 MLT between roughly 12:30 and 13:00 UT by ISEE-1 and 12:00 and 13:00 UT by ISEE-2. During these periods, both electron and ion fluxes increased by mor...

Frank, L. A.: Plasma in the earth's polar magnetosphere, J. Geophys. Res., 76, 5202–5219, 1971.; Jackson, J. D.: Classical Electrodynamics, John Wiley and Sons Inc., New York, 1975.; Antonova, A. E., Gubar, Yu. I., and Kropotlin, A. P.: Energetic Particle Population in the High-Latitude Geomagnetosphere, Phys. Chem. Earth (C), 25(1–2), 47–50, 2000.; Blake, J. B.: Comment on Cusp: A new Acceleration Region of the Magnetosphere' by Jiasheng Chen et al., Czech, J. Phys., 49...

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Automatic Detection of Ionospheric Alfvén Resonances Using Signal ...

By: C. D. Beggan

Description: British Geological Survey, West Mains Road, Edinburgh, EH9 3LA, UK. Induction coils permit the measurement of small and very rapid changes of the magnetic field. A new set of induction coils in the UK (at L = 3.2) record magnetic field changes over an effective frequency range of 0.1–40 Hz, encompassing phenomena such as the Schumann resonances, magnetospheric pulsations and ionospheric Alfvén resonances (IARs). The IARs typically manifest themse...

Belyaev, P. P., Polyakov, C. V., Rapoport, V. O., and Trakhtengerts, V. Y.: Experimental studies of the spectral resonance structure of the atmospheric electromagnetic noise background within the range of short-period geomagnetic pulsations, Radiophys. Quantum El., 32, 491–501, doi:10.1007/BF01058169, 1989.; Belyaev, P. P., Polyakov, S., Rapoport, V., and Trakhtengerts, V. Y.: The ionospheric Alfvén resonator, J. Atmos. Te...

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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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Observations of Substorm Fine Structure : Volume 16, Issue 7 (30/1...

By: T. V. Kozelova; R. Rasinkangas; A. Korth; G. Reeves; H. Singer; B. B. Gvozdevsky; L. L. Lazutin; W. Riedler; K. Torkar

Description: Polar Geophysical Institute, Russian Academy of Sciences, Apatity, Murmansk Region, 184200, Russia. Particle and magnetic field measurements on the CRRES satellite were used, together with geosynchronous satellites and ground-based observations, to investigate the fine structure of a magnetospheric substorm on February 9, 1991. Using the variations in the electron fluxes, the substorm activity was divided into several intensifications lasting about 3–15 ...

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Coherent Amplitude Modulation of Electron-beam-driven Langmuir Wav...

By: K. Baumgärtel

Description: Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany. A linear approach to the phenomenon of irregular amplitude modulation of beam-driven Langmuir waves, developed in a previous paper, is extended to explain periodic modulation as well. It comes about by beating of the fastest growing mode of the instability with beam-aligned plasma oscillations. They are naturally generated in a uniform domain of beam–plasma interactio...

Baumgärtel, K.: A linear model for amplitude modulation of Langmuir waves in weak electron-beam plasma interaction, Ann. Geophys., 31, 31–38, doi:10.5194/angeo-31-31-2013, 2013.; Daldorff, L. K. S., Pecseli, H. L., Trulsen, J. K., Ulriksen, M. I., Eliasson, B., and Stenflo, L.: Nonlinear beam generated plasma waves as a source for enhanced plasma and ion acoustic lines, Phys. Plasmas, 18, 052107,

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Summer Sudden Na Number Density Enhancements Measured with the Alo...

By: U. Blum; P. Acott; U.-p. Hoppe; D. Heinrich; B. Williams; H. Nesse

Description: Norwegian Defence Research Establishment (FFI), 2027 Kjeller, Norway. We present summer Na-densities and atmospheric temperatures measured 80 to 110 km above the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR). The Weber Na Lidar is part of ALOMAR, located at 69° N in Norway, 150 km north of the Arctic Circle. The sun does not set here during the summer months, and measurements require a narrowband Faraday Anomalous Dispersion Optical F...

Arnold, K. S. and She, C.-Y.: Metal fluorescence lidar (light detection and ranging) and the middle atmosphere, Contemporary Physics, 44, 35–49, 2003.; Batista, P. P., Clemesha, B. R., and Simonich, D. M.: Horizontal structures in sporadic sodium layers at 23° S, Geophys. Res. Lett, 18, 1027–1030, 1991.; Balsley, B. B., Ecklund, W. L., and Fritts, D. C.: VHF echoes from the high-altitude mesophere and lower thermosphere: observations and interpretations, J. Atmos. Sci., ...

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Numerical Simulation of Mid-latitude Ionospheric E-region Based on...

By: S. Fukao; T. Takahashi; M. Yamamoto; T. Yokoyama; M. Tanaka

Description: Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan. Observational campaigns of the mid-latitude ionospheric E-region with sounding rockets and ground-based instruments were conducted in 1996 (SEEK) and 2002 (SEEK-2). Both of them were successfully conducted to bring important findings about the mid-latitude E-region and quasi-periodic (QP) VHF radar echoes. The observational results in the SEEK and the S...

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Directional Features of the Downshifted Peak Observed in Hf-induce...

By: A. Brekke; B. Isham; M. Grill; E. D. Tereshchenko; T. Hagfors; V. Belyey; R. Yu. Yurik; M. T. Rietveld; B. Z. Khudukon

Description: Polar Geophysical Institute, Murmansk, Russia. A high frequency (HF) ionospheric modification experiment was carried out between 25 September and 8 October 2004, using the EISCAT HF transmitter located near Tromsø, Norway. During this experiment the spectra of the stimulated HF sideband waves (stimulated electromagnetic emission or SEE) induced by the HF pump were observed using an interferometer consisting of three spaced receiving antennas with baseli...

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Dynamics and Local Boundary Properties of the Dawn-side Magnetopau...

By: A. Balogh; M. W. Dunlop; G. Haerendel; W. Baumjohann; K.-h. Fornacon; E. Georgescu; R. Nakamura; S. Kokubin

Description: Space and Atmospheric Physics Group, Imperial College, London SW7 2BZ, UK. Magnetic field measurements, taken by the magnetometer experiment (MAM) on board the German Equator-S spacecraft, have been used to identify and categorise 131 crossings of the dawn-side magnetopause at low latitude, providing unusual, long duration coverage of the adjacent magnetospheric regions and near magnetosheath. The crossings occurred on 31 orbits, providing unbiased cove...

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Velocity Shear-related Ion Upflow in the Low-altitude Ionosphere :...

By: H. Liu; G. Lu

Description: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, Germany. Strong ion upflows with field-aligned velocity above 1000ms were observed by the European Incoherent Scatter (EISCAT) UHF Radar at Tromsø, Norway in the dayside auroral region at heights between 500–600km during the 15 May 1997 magnetic storm. Both the EISCAT observations and the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) simulation results show that this even...

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Observation- and Numerical-analysis-based Dynamics of the Uttarkas...

By: A. Misra; R. Srivastava; S. Tripathi; C. Chaudhuri

Description: Department of Civil Engineering, Indian Institute of Technology, Kanpur, India. A Himalayan cloudburst event, which occurred on 3 August 2012 in the Uttarkashi (30.73° N, 78.45° E) region of Uttarakhand, India, was analyzed. The near-surface atmospheric variables were analyzed to study the formation, evolution, and triggering mechanisms of this cloudburst. In order to improve upon the understanding provided by the observations, numerical simulations wer...

Ashrit, R.: Investigating the Leh Cloudburst, NCMRWF internel report NMRF/RR/10/2010, Ministry of Earth Science, A-50, Sector-62, Noida-201307, India, 2010.; Borga, M., Stoffel, M., Marchi, L., Marra, F., and Jakob, M.: Hydrogeomorphic response to extreme rainfall in headwater systems: Flash floods and debris flows, J. Hydrol., 518, 194–205, doi:10.1016/j.jhydrol.2014.05.022, 2014.; Bougeault, P., Binder, P., Bi...

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Evidence for Thermospheric Gravity Waves in the Southern Polar Cap...

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

Description: Australian Antarctic Division, Kingston, Tasmania, 7050, Australia. Zenith-directed Fabry-Perot Spectrometer (FPS) and 3-Field Photometer (3FP) observations of the λ630 nm emission (~240 km altitude) were obtained at Davis station, Antarctica, during the austral winter of 1999. Eleven nights of suitable data were searched for significant periodicities common to vertical winds from the FPS and photo-metric variations from the 3FP. Three wave-like events...

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Complex Image Method for Calculating Electric and Magnetic Fields ...

By: R. Pirjola; A. Viljanen

Description: Finnish Meteorological Institute, Geophysical Research Division P. O. Box 503, FIN-00101 Helsinki, Finland. The electromagnetic field due to ionospheric currents has to be known when evaluating space weather effects at the earth's surface. Forecasting methods of these effects, which include geomagnetically induced currents in technological systems, are being developed. Such applications are time-critical, so the calculation techniques of the electromagn...

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Mapping of the Quasi-periodic Oscillations at the Flank Magnetopau...

By: T. W. Moore; K. Nykyri; E. R. Dougal

Description: Sandia National Laboratories, Albuquerque, NM, USA. We have estimated the ionospheric location, area, and travel time of quasi-periodic oscillations originating from the magnetospheric flanks. This was accomplished by utilizing global and local MHD models and Tsyganenko semi-empirical magnetic field model on multiple published and four new cases believed to be caused by the Kelvin–Helmholtz Instability. Finally, we used auroral, magnetometer, and radar ...

Balogh, A., Dunlop, M. W., Cowley, S. W. H., Southwood, D. J., Thomlinson, J. G., and magnetometer team, C.: The Cluster Magnetic Field Investigation, Space Sci. Rev., 79, 65–91, 1997.; Balogh, A., Carr, C. M., Acuña, M. H., Dunlop, M. W., Beek, T. J., Brown, P., Fornacon, K.-H., Georgescu, E., Glassmeier, K.-H., Harris, J., Musmann, G., Oddy, T., and Schwingenschuh, K.: The Cluster Magnetic Field Investigation: overview of in-flight performance and initial results, Ann....

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Relationships Between Electron Density, Height and Sub-peak Ionosp...

By: M. Sjarifudin; K. J. W. Lynn; T. J. Harris

Description: Ionospheric Systems Research, Noosaville, Australia. The development and decay of the southern equatorial anomaly night-time peak in electron density as seen at a number of ionosonde reflection points extending from New Guinea and Indonesia into northern Australia was examined in terms of the characteristic rise and fall in height associated with the sunset ionisation-drift vortex at the magnetic equator. The observations relate to measurements made in ...

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F2-layer Parameters Long-term Trends at the Argentine Islands and ...

By: A. V. Mikhailov; A. D. Danilov

Description: Institute of Applied Geophysics, Rostokinskaya 9, Moscow 129128, Russia. The ionospheric sounding data at two southern hemisphere stations, the Argentine Islands and Port Stanley, are analyzed using a method previously developed by the authors. Negative trends of the critical frequency foF2 are found for both stations. The magnitudes of the trends are close to those at the corresponding (close geomagnetic latitude) stations of the northern hemisp...

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Retrieval of Dust Aerosols During Night: Improved Assessment of Lo...

By: J. Srinivasan; S. Deepshikha

Description: Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore-560012, India. Several investigators in the past have used the radiance depression (with respect to clear-sky infrared radiance), resulting from the presence of mineral dust aerosols in the atmosphere, as an index of dust aerosol load in the atmosphere during local noon. Here, we have used a modified approach to retrieve dust index during night since assessment of diurna...

Chandra, S., Satheesh, S. K., and Srinivasan, J.: Can the state of mixing of black carbon aerosols explain the mystery of excess atmospheric absorption?, Geophys. Res. Lett., 31, L19109, doi:10.1029/2004GL020662, 2004.; Coackley, J. A. and Bretherton, F. P.: Cloud cover from high resolution scanner data: method and preliminary results, J. Geophys. Res., 87, 4917–4932, 1982.; Deepshikha, S., Satheesh, S. K., and Srinivasan, J.: Regional Distribution of Absorbing Efficienc...

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The East-west Asymmetry in Coronal Mass Ejections: Evidence for Ac...

By: M. Skirgiello

Description: Space Research Center of Polish Academy of Sciences, Warsaw, Poland. Various manifestations of solar activity are not uniformly distributed with heliographic longitude. By using east-west asymmetry in the occurrence rate of CMEs (coronal mass ejections), the longitudinal dependence in SOHO LASCO 1996-2004 data has been studied in this work. The solar rotation periodicity has been found, indicating the presence of active longitudes, whose phase is revers...

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Sas Wave Experiment on Board Magion 4 : Volume 15, Issue 5 (30/11/...

By: J. Vojta; J. Juchniewicz; J. Błęcki; S. Gadomski; V. Korepanov; J. Słomiński; R. Wronowski; Z. Krawczyk; P. Triska; S. Savin

Description: Space Research Centre PAS, Bartycka 18A ,00716, Warsaw, Poland. A short description of the SAS (subsatellite analyser of spectra) wave experiment on board the Magion-4 subsatellite is given. We present first measurements of the magnetic-field fluctuations in the frequency range 32–2000 Hz obtained in the magnetotail during the disturbed period at the magnetopause and in the polar cusp.

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