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  • 1.
    Buchert, Stephan C.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Eriksson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Gill, Reine
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Nilsson, Thomas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Åhlén, Lennart
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Wahlund, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Knudsen, David
    Univ Calgary, Calgary, AB, Canada..
    Burchill, Johnathan
    Univ Calgary, Calgary, AB, Canada..
    Archer, William
    Univ Calgary, Calgary, AB, Canada..
    Kouznetsov, Alexei
    Univ Calgary, Calgary, AB, Canada..
    Stricker, Nico
    ESA ESTEC, Noordwijk, Netherlands..
    Bouridah, Abderrazak
    ESA ESTEC, Noordwijk, Netherlands..
    Bock, Ralph
    ESA ESTEC, Noordwijk, Netherlands..
    Haggstrom, Ingemar
    EISCAT Sci Assoc, Headquarters, Kiruna, Sweden..
    Rietveld, Michael
    EISCAT Sci Assoc, Tromso, Norway..
    Gonzalez, Sixto
    Natl Astron & Ionosphere Ctr, Arecibo, PR USA..
    Aponte, Nestor
    Natl Astron & Ionosphere Ctr, Arecibo, PR USA..
    First results from the Langmuir probes on the Swarm satellites2014In: 2014 XXXITH URSI General Assembly And Scientific Symposium (URSI GASS), 2014Conference paper (Refereed)
  • 2.
    Knudsen, D. J.
    et al.
    Univ Calgary, Dept Phys & Astron, Calgary, AB, Canada.
    Burchill, J. K.
    Univ Calgary, Dept Phys & Astron, Calgary, AB, Canada.
    Buchert, Stephan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Eriksson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Gill, Reine
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Wahlund, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Åhlén, Lennart
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Smith, M.
    COM DEV Int, Cambridge, ON, Canada.
    Moffat, B.
    Univ Waterloo, Ctr Educ Math & Comp, Waterloo, ON, Canada;COM DEV Int, Cambridge, ON, Canada.
    Thermal ion imagers and Langmuir probes in the Swarm electric field instruments2017In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 122, no 2, p. 2655-2673Article in journal (Refereed)
    Abstract [en]

    The European Space Agency's three Swarm satellites were launched on 22 November 2013 into nearly polar, circular orbits, eventually reaching altitudes of 460 km (Swarm A and C) and 510 km (Swarm B). Swarm's multiyear mission is to make precision, multipoint measurements of low-frequency magnetic and electric fields in Earth's ionosphere for the purpose of characterizing magnetic fields generated both inside and external to the Earth, along with the electric fields and other plasma parameters associated with electric current systems in the ionosphere and magnetosphere. Electric fields perpendicular to the magnetic field.B are determined through ion drift velocity v(i) and magnetic field measurements via the relation.E. = -.vi x.B. Ion drift is derived from two-dimensional images of low-energy ion distribution functions provided by two Thermal Ion Imager (TII) sensors viewing in the horizontal and vertical planes;v(i) is corrected for spacecraft potential as determined by two Langmuir probes (LPs) which also measure plasma density ne and electron temperature T-e. The TII sensors use a microchannel-plate-intensified phosphor screen imaged by a charge-coupled device to generate high-resolution distribution images (66 x 40 pixels) at a rate of 16 s(-1). Images are partially processed on board and further on the ground to generate calibrated data products at a rate of 2 s(-1); these include.vi,.E., and ion temperature T-i in addition to electron temperature Te and plasma density n(e) from the LPs.

  • 3. Lindqvist, P. -A
    et al.
    Olsson, G.
    Royal Inst Technol, Stockholm, Sweden..
    Torbert, R. B.
    Univ New Hampshire, Durham, NH 03824 USA..
    King, B.
    Univ New Hampshire, Durham, NH 03824 USA..
    Granoff, M.
    Univ New Hampshire, Durham, NH 03824 USA..
    Rau, D.
    Univ New Hampshire, Durham, NH 03824 USA..
    Needell, G.
    Univ New Hampshire, Durham, NH 03824 USA..
    Turco, S.
    Univ New Hampshire, Durham, NH 03824 USA..
    Dors, I.
    Univ New Hampshire, Durham, NH 03824 USA..
    Beckman, P.
    Univ New Hampshire, Durham, NH 03824 USA..
    Macri, J.
    Univ New Hampshire, Durham, NH 03824 USA..
    Frost, C.
    Univ New Hampshire, Durham, NH 03824 USA..
    Salwen, J.
    Univ New Hampshire, Durham, NH 03824 USA..
    Eriksson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Åhlén, Lennart
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Khotyaintsev, Yuri V.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Porter, J.
    Univ Oulu, Oulu, Finland..
    Lappalainen, K.
    Univ Oulu, Oulu, Finland..
    Ergun, R. E.
    Univ Colorado, Boulder, CO 80309 USA..
    Wermeer, W.
    Univ Colorado, Boulder, CO 80309 USA..
    Tucker, S.
    Univ Colorado, Boulder, CO 80309 USA..
    The Spin-Plane Double Probe Electric Field Instrument for MMS2016In: Space Science Reviews, ISSN 0038-6308, E-ISSN 1572-9672, Vol. 199, no 1-4, p. 137-165Article, review/survey (Refereed)
    Abstract [en]

    The Spin-plane double probe instrument (SDP) is part of the FIELDS instrument suite of the Magnetospheric Multiscale mission (MMS). Together with the Axial double probe instrument (ADP) and the Electron Drift Instrument (EDI), SDP will measure the 3-D electric field with an accuracy of 0.5 mV/m over the frequency range from DC to 100 kHz. SDP consists of 4 biased spherical probes extended on 60 m long wire booms 90(a similar to) apart in the spin plane, giving a 120 m baseline for each of the two spin-plane electric field components. The mechanical and electrical design of SDP is described, together with results from ground tests and calibration of the instrument.

  • 4.
    Ronchi, Emanuele
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Andersson Sundén, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Conroy, Sean
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Ericsson, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Gatu Johnson, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Kallne, J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Hellesen, Carl
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Hjalmarsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Sjöstrand, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Weiszflog, Matthias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Puccio, Walter
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Åhlen, Lennart
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    A bipolar LED drive technique for high performance, stability and power in the nanosecond time scale2009In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 599, no 2-3, p. 243-247Article in journal (Refereed)
    Abstract [en]

    Pulsed light sources are often used to monitor the stability of light detectors such as photomultiplier tubes. Light emitting diodes (LEDs) are suitable for this due to their high specific light yield. While pulsed operation in the region of [mu]s is generally accessible with most LEDs and drivers, the ns time scale often represents a technical challenge. This paper describes a technique of bipolar LED drive that can produce light pulses of a few ns at high stability, reliability and power. The driver also offers control over the properties of the light pulse produced such as shape, intensity and repetition rate. This approach has been studied in 2003 and implemented in 2004 for two fusion neutron spectrometers at the Joint European Torus (JET) namely the Magnetic Proton Recoil upgrade (MPRu) and the Time Of Flight Optimized for Rate (TOFOR). A driver has been manufactured and connected to the scintillation detectors of each spectrometer through an optical fiber distribution network. Both MPRu and TOFOR have been successfully relying on this system for calibration and performance monitoring for several years, confirming the long-term stability and reliability of this technique.

  • 5.
    Soucek, J.
    et al.
    Acad Sci Czech Republic, Inst Atmospher Phys, Prague, Czech Republic..
    Åhlén, Lennart
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Bale, S.
    UCB, Space Sci Lab, Berkeley, CA USA..
    Bonnell, J.
    UCB, Space Sci Lab, Berkeley, CA USA..
    Boudin, N.
    ESA ESTEC, Noordwijk, Netherlands..
    Brienza, D.
    IAPS, Rome, Italy..
    Carr, C.
    Imperial Coll, London, England..
    Cipriani, F.
    ESA ESTEC, Noordwijk, Netherlands..
    Escoubet, C. P.
    ESA ESTEC, Noordwijk, Netherlands..
    Fazakerley, A.
    UCL, Mullard Space Sci Lab, Dorking, Surrey, England..
    Gehler, M.
    ESA ESTEC, Noordwijk, Netherlands..
    Genot, V.
    IRAP, Toulouse, France..
    Hilgers, A.
    ESA ESTEC, Noordwijk, Netherlands..
    Hanock, B.
    UCL, Mullard Space Sci Lab, Dorking, Surrey, England..
    Jannet, G.
    LPC2E, Orleans, France..
    Junge, A.
    ESA ESTEC, Noordwijk, Netherlands..
    Khotyaintsev, Yuri
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    De Keyser, J.
    BIRA IASB, Brussels, Belgium..
    Kucharek, H.
    Univ New Hampshire, Durham, NH 03824 USA..
    Lan, R.
    Acad Sci Czech Republic, Inst Atmospher Phys, Prague, Czech Republic..
    Lavraud, B.
    IRAP, Toulouse, France..
    Leblanc, F.
    Plasma Phys Lab, Paris, France..
    Magnes, W.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Mansour, M.
    Plasma Phys Lab, Paris, France..
    Marcucci, M. F.
    IAPS, Rome, Italy..
    Nakamura, R.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Nemecek, Z.
    Charles Univ Prague, Prague, Czech Republic..
    Owen, C.
    UCL, Mullard Space Sci Lab, Dorking, Surrey, England..
    Phal, Y.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Retino, A.
    Plasma Phys Lab, Paris, France..
    Rodgers, D.
    ESA ESTEC, Noordwijk, Netherlands..
    Safrankova, J.
    Charles Univ Prague, Prague, Czech Republic..
    Sahraoui, F.
    Plasma Phys Lab, Paris, France..
    Vainio, R.
    Univ Turku, Turku, Finland..
    Wimmer-Schweingruber, R.
    Univ Kiel, Kiel, Germany..
    Steinhagen, J.
    Univ Kiel, Kiel, Germany..
    Vaivads, Andris
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Wielders, A.
    ESA ESTEC, Noordwijk, Netherlands..
    Zaslavsky, A.
    Observ Paris, LESIA, Ifeudon, France..
    EMC Aspects Of Turbulence Heating Observer (THOR) Spacecraft2016In: Proceedings Of 2016 Esa Workshop On Aerospace Emc (Aerospace Emc), 2016Conference paper (Refereed)
    Abstract [en]

    Turbulence Heating ObserveR (THOR) is a spacecraft mission dedicated to the study of plasma turbulence in near-Earth space. The mission is currently under study for implementation as a part of ESA Cosmic Vision program. THOR will involve a single spinning spacecraft equipped with state of the art instruments capable of sensitive measurements of electromagnetic fields and plasma particles. The sensitive electric and magnetic field measurements require that the spacecraft-generated emissions are restricted and strictly controlled; therefore a comprehensive EMC program has been put in place already during the study phase. The THOR study team and a dedicated EMC working group are formulating the mission EMC requirements already in the earliest phase of the project to avoid later delays and cost increases related to EMC. This article introduces the THOR mission and reviews the current state of its EMC requirements.

  • 6.
    Soucek, J.
    et al.
    Acad Sci Czech Republic, Inst Atmospher Phys, Prague, Czech Republic..
    Åhlén, Lennart
    Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
    Bale, S.
    UCB, Space Sci Lab, Berkeley, CA USA..
    Bonnell, J.
    UCB, Space Sci Lab, Berkeley, CA USA..
    Boudin, N.
    ESA ESTEC, Noordwijk, Netherlands..
    Brienza, D.
    IAPS, Rome, Italy..
    Carr, C.
    Imperial Coll, London, England..
    Cipriani, F.
    ESA ESTEC, Noordwijk, Netherlands..
    Escoubet, C. P.
    ESA ESTEC, Noordwijk, Netherlands..
    Fazakerley, A.
    UCL, Mullard Space Sci Lab, Dorking, Surrey, England..
    Gehler, M.
    ESA ESTEC, Noordwijk, Netherlands..
    Genot, V.
    IRAP, Toulouse, France..
    Hilgers, A.
    ESA ESTEC, Noordwijk, Netherlands..
    Hanock, B.
    UCL, Mullard Space Sci Lab, Dorking, Surrey, England..
    Jannet, G.
    LPC2E, Orleans, France..
    Junge, A.
    ESA ESTEC, Noordwijk, Netherlands..
    Khotyaintsev, Yuri
    Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
    De Keyser, J.
    BIRA IASB, Brussels, Belgium..
    Kucharek, H.
    Univ New Hampshire, Durham, NH 03824 USA..
    Lan, R.
    Acad Sci Czech Republic, Inst Atmospher Phys, Prague, Czech Republic..
    Lavraud, B.
    IRAP, Toulouse, France..
    Leblanc, F.
    Plasma Phys Lab, Paris, France..
    Magnes, W.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Mansour, M.
    Plasma Phys Lab, Paris, France..
    Marcucci, M. F.
    IAPS, Rome, Italy..
    Nakamura, R.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Nemecek, Z.
    Charles Univ Prague, Prague, Czech Republic..
    Owen, C.
    UCL, Mullard Space Sci Lab, Dorking, Surrey, England..
    Phal, Y.
    Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
    Retino, A.
    Plasma Phys Lab, Paris, France..
    Rodgers, D.
    ESA ESTEC, Noordwijk, Netherlands..
    Safrankova, J.
    Charles Univ Prague, Prague, Czech Republic..
    Sahraoui, F.
    Plasma Phys Lab, Paris, France..
    Vainio, R.
    Univ Turku, Turku, Finland..
    Wimmer-Schweingruber, R.
    Univ Kiel, Kiel, Germany..
    Steinhagen, J.
    Univ Kiel, Kiel, Germany..
    Vaivads, Andris
    Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
    Wielders, A.
    ESA ESTEC, Noordwijk, Netherlands..
    Zaslavsky, A.
    Observ Paris, LESIA, Ifeudon, France..
    EMC Aspects Of Turbulence Heating Observer (THOR) Spacecraft2016In: Proceedings Of 2016 Esa Workshop On Aerospace Emc (Aerospace Emc), Institute of Electrical and Electronics Engineers (IEEE), 2016, article id 7504544Conference paper (Refereed)
    Abstract [en]

    Turbulence Heating ObserveR (THOR) is a spacecraft mission dedicated to the study of plasma turbulence in near-Earth space. The mission is currently under study for implementation as a part of ESA Cosmic Vision program. THOR will involve a single spinning spacecraft equipped with state of the art instruments capable of sensitive measurements of electromagnetic fields and plasma particles. The sensitive electric and magnetic field measurements require that the spacecraft-generated emissions are restricted and strictly controlled; therefore a comprehensive EMC program has been put in place already during the study phase. The THOR study team and a dedicated EMC working group are formulating the mission EMC requirements already in the earliest phase of the project to avoid later delays and cost increases related to EMC. This article introduces the THOR mission and reviews the current state of its EMC requirements.

  • 7. Stål, Oscar
    et al.
    Bergman, Jan
    Thide, Bo
    Ahlen, L
    Ingelman, Gunnar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Högenergifysik.
    Lunar Satellite Detection of Ultra-High Energy Neutrinos with the Use of Radio Methods2005In: DGLR Interational Symposium: To Moon and Beyond, Bremen, Germany, 15-16 Sep 2005., 2005Conference paper (Refereed)
    Abstract [en]

    Neutrinos interact with matter only through weak processes with low cross-section. To detect cosmic neutrinos most efforts have relied on the detection of visible Vavilov-Cerenkov light in detectors embedded in the target volumes. To access the decreasing flux of ultra-high energy neutrinos, far above 1 PeV, ideas on how to increase the detection volume by observing coherent radio frequency emission caused by the Askaryan effect have been put forward. Here we describe how a satellite in lunar orbit equipped with an electromagnetic vector sensor could detect Askaryan pulses induced by neutrinos interacting with the moon. The threshold neutrino energy is found to be 50 EeV for this setup, and the sensitivity is determined from simulations. A model dependent event rate of 2.2 events per year is calculated.

1 - 7 of 7
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