Introducing POMME Potsdam Magnetic Model of the Earth Star camera calibration Ring current field Static and annually varying external fields Internal field.

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Presentation transcript:

Introducing POMME Potsdam Magnetic Model of the Earth Star camera calibration Ring current field Static and annually varying external fields Internal field Stefan Maus Stefan Maus, George Balasis, Hermann Lühr and Martin Rother, GFZ Mioara Mandea, IPGP

POMME main field model Internal field: Gauss coefficients g n m to degree 15  t g n m to degree 15  t  t g n m to degree 10 External field: Dst dependent external dipole aligned with internal field dipole Gauss coefficients k n m to degree 2 in Geocentric Solar Magnetic (GSM) coordinates Star camera angle: corrections for 6 time intervals

Oersted data before/after median filter

Residuals against initial field model

Calibration for the angle between the star sensor and the vector magnetometer Fluxgate vector magnetometer Starsensor

Z residuals against Pomme 1.4

Dst dependence of earlier field models

Dst dependence of Pomme

Dst versus induced RC field of Pomme

Magneto- sphere

A constant external field in GSM: Annual variation seen by an Earth fixed observer at 0 degree longitude, 30 degree latitude

A constant external field in GSM: Comparison with CO2’s external field (observer at 0 degree longitude, 30 degree latitude)

Main field model power spectrum

Model with 3 rd time derivative

Conclusions Stefan Maus 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:

Examples of Instrument Problems

Examples of genuine magnetic disturbances

Diamagnetic effect at 20:00 local time

Night side F region currents

E - Region B Regions of enhanced plasma density

E - Region B Regions of enhanced plasma density

CHAMP electron density, Oct 2001, 20 LT

Diamagnetic effect at 20:00 local time

Satellites POGO ( ) MAGSAT ( ) –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