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Instrumentation at Trondheim Relevant for ARISE
P.J. Espy
R.E. Hibbins
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Overview of Instrumentation
Multi-Spectral All-Sky Airglow Imager
Advanced Meteor Radar at the Dragvoll Campus of NTNU
Hydroxyl Airglow Spectrometer
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Advanced Meteor Radar
175 km
• Transmits a 35 kW pulse• Reflects from ionized meteor trails• Interferometric receiver array
• Spatially locates the echo• Sees motion of individual trails
• Detects sporadic meteors • Between 70-110 km in 2 km steps
• Individual line of sight winds used to deduce 2D wind every 2 km between 75-105 km
• Temporal resolution better than 1 hr
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Advanced Meteor Radar
Total number of meteors detected:~10,000 per day between
~70 and 110 km
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Advanced Meteor Radar
Hydroxyl Airglow Co-Located with meteors
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Advanced Meteor Radar
Hydroxyl Airglow Co-Located with meteorsImager characterizes the 2-D gravity wave structure
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Advanced Meteor Radar
Hydroxyl Airglow Co-Located with meteorsSpectrometer characterizes the temperature/density
fluctuations at a point in the radar
OH M(3,1) & (4,2) bands, 20 s integration
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Radar Wind Measurements
Tides that provide sharp wind gradients &Change wind direction 100 m/s every 12 h
Tides severely underestimated in models such as HWM-07 and WACCM-SD
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Radar Wind Measurements
Merge radar winds with MERRA analysis to provide whole-atmosphere view
Mean meteor winds (tides removed) and MERRA during stratospheric warming event
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Radar Wind Measurements
Note WACCM-SD overestimates wind shear above constraint region (60 km) and has wrong direction above 70 km
Meteor radar-MERRA @ TRD WACCM-SD @ TRD
Merge radar winds with MERRA analysis to provide whole-atmosphere view
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Gravity waves with meteor radar
Gravity waves create excess variance in the wave-propagation direction
Gravity-wave momentum flux and momentum-flux divergence can be measured
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Individual gravity waves observed
Directional Variance
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Individual gravity waves observed
Directional Variance
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Meso-scale Wave Observations
700
km
TRD
ANX
Compare winds from Trondheim (TRD) meteor radar with those from the IAP Kühlungsborn (Germany) meteor radar located at Andenes (ANX)
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csPlanetary waves using array of SuperDARN meteor radars
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Conclusions
• Suite of instrumentation at Trondheim• Allows observation of mean winds and tides with
2 km vertical resolution and high temporal resolution• Combined with MERRA provides whole-atmosphere
picture of winds from 0-105 km• Characterization of gravity-wave bulk properties:
variance, momentum flux and wave forcing• 3-D characterization of temperature, density and
wind variation from individual gravity waves
• In collaboration with other radars• Characterization of meso-scale wave systems from
75-105 km
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Atmospheric and environmental physics group
• Department of Physics, NTNU and Birkeland Centre for Space Sciences (UiB, NTNU, UNIS)– Patrick Espy, Professor
– Robert Hibbins, Professor
– Marianne Daae, BCSS-SFF stipendiat
– Rosmarie de Wit, NTNU stipendiat
– Amund Gjendem, NTNU stipendiat
– Nora Kleinknecht, NTNU stipendiat
– Venkat Rao Narkull BCSS-SFF Postdoctoral fellow
– 6 MSc students (presently)
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