introducing pomme potsdam magnetic model of the earth star camera calibration ring current field...
TRANSCRIPT
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Introducing POMME Potsdam Magnetic Model of the Earth
• Star camera calibration• Ring current field• Static and annually varying external fields• Internal field
Stefan [email protected]
Stefan Maus, George Balasis,
Hermann Lühr and Martin Rother, GFZ
Mioara Mandea, IPGP
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POMME main field model
Internal field:
• Gauss coefficients gnm
to degree 15 tgn
m to degree 15
ttgnm to degree 10
External field:• Dst dependent external
dipole aligned with internal field dipole
• Gauss coefficients knm to
degree 2 in Geocentric Solar Magnetic (GSM) coordinatesStar camera angle:
• corrections for 6 time intervals
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Oersted data before/after median filter
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Residuals against initial field model
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Calibration for the angle between the star sensor and the vector magnetometer
Fluxgate vector magnetometer
Starsensor
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Z residuals against Pomme 1.4
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Dst dependence of earlier field models
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Dst dependence of Pomme
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Dst versus induced RC field of Pomme
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Magneto-sphere
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A constant external field in GSM: Annual variation seen by an Earth fixed observer at
0 degree longitude, 30 degree latitude
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A constant external field in GSM: Comparison with CO2’s external field
(observer at 0 degree longitude, 30 degree latitude)
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Main field model power spectrum
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Model with 3rd time derivative
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Conclusions
Stefan [email protected]
Data errors: Important to take instrument errors, star camera mis-alignment and F-Region currents into account
New features in POMME: • Includes co-estimated star camera angles for CHAMP• Imposed realistic Dst dependence of RC field• Describes magnetospheric fields in GSM coordinates• Includes secular acceleration
See: www.gfz-potsdam.de/pb2/pb23/SatMag/model.html
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Examples of Instrument Problems
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Examples of genuine magnetic disturbances
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Diamagnetic effect at 20:00 local time
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Night sideF region currents
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E - Region
B
Regions of enhanced plasma density
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E - Region
B
Regions of enhanced plasma density
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E - Region
B
Regions of enhanced plasma density
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CHAMP electron density, 23-23 Oct 2001, 20 LT
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Diamagnetic effect at 20:00 local time
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Satellites POGO (1967-1971)
MAGSAT (1979-1980)– 350 – 650 km altitude– mission duration: 6 months
Oersted (since 1999)SAC-C (since 2001)
– 600 – 800 km altitude
CHAMP (since 2000) – 450 km altitude, decending– 5 year mission