The EISCAT Radar Facilities
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Transcript of The EISCAT Radar Facilities
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The EISCAT Radar Facilities
Ian McCreaSTFC RAL
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What is EISCAT?• International Scientific Association• Established agreeement since 1975• First observations in 1981• HQ in Sweden
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EISCAT’s Mission Statement
EISCAT aims to make available the necessary knowledge and techniques:
• To understand the various forms of coupling between the Sun, the terrestrial magnetosphere and the upper atmosphere of the high-latitude regions
• To understand the plasma physics and dynamics responsible for these interactions• To investigate the effects of natural and anthropogenic forcing on the upper
atmosphere• To facilitate the better monitoring and prediction of these processes
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Incoherent Scatter
• Electrons re-radiate the radar signal with random phase
• Electron motion follows the thermal fluctuations in the ion gas.
• If the probing wavelength is longer than the Debye length, the fluctuations dominate the scatter.
• Radar pick outs towards and away propogating ion-acoustic waves satisfying the Bragg condition
1 202e
DkTne
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EISCAT Facilities: Mainland UHF• Three identical fully steerable dishes,
frequencies ~ 928 MHz.• Transmit at T, receive at T, K, S• Additional reception at 1.42 GHz• Increasing problems with mobile phones
at remotes• Tromsø guaranteed to end of 2013
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EISCAT Facilities: Mainland VHF
• Frequency ~224 MHz.• Cylindrical paraboloid antenna 120m x 40m• Dish in four independent sections• Steerable in meridian plane• Limited beam-steering in zonal direction• Two very large klystrons, only one working
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EISCAT Facilities: ESR• Frequency ~500 MHz.• Two dishes: one steerable, one
fixed field-aligned• Share common transmitter• Small “TV Tx” style klystrons• Third (Chinese) ESR dish by 2014?
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EISCAT Facilities: Heater & Dynasondes• Heater Frequency 4-
8 MHz• Two Tx arrays• ERP up to 1.2 GW• Advanced
ionosondes at Tromsø and ESR
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Rules of the Road
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Original Science Motivation:“The Seven Wonders of EISCAT”
Seven initial objectives of EISCAT (as defined by EISCAT Scientific Advisory Committee, 1979)
• Detailed mapping of auroral arcs
• High-resolution D and E-region response to precipitation
• Understanding of association between auroral electrojets and gravity waves
• Clear detection of the polar wind
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Original Science Motivation:“The Seven Wonders of EISCAT”
Seven initial objectives of EISCAT (as defined by EISCAT Scientific Advisory Committee, 1979)
• Measurement of polar cap convection patterns
• Ionospheric images of polar cleft, plasmapause and plasma sheet
• Detailed measurements of the polar mesosphere
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Future Science:Whole Atmosphere Coupling
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Future Science:Long-term trends and global change
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Future Science:Energy flow and large-scale structure
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Future Science:Wave-wave and wave-particle coupling
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Future Science:Space Weather and Space Debris
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Future Science:Solar System Physics
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Future Systems: EISCAT_3D
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Future Systems: MAISR
• Proposal of NSF Office of Polar Programs• Study differences between Northern and
Southern hemispheres• Different magnetic field, different
topography, different vortex• Could be ready for deployment in 2015• US will fund 80% of facility – looking for
international partners for the other 20%
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The UK EISCAT Community
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UK Synergy and Co-ordination
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ESFRI Projects for Env. Sciences
LIFEWATCH
EMSO
IAGOS-ERI
AURORA BOREALIS
EUFAR-COPAL
ICOS
EURO-ARGO
EPOS
EISCAT-3D
SIOS
Status 2009
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