URSI XXVI General Assembly, Toronto, Canada, 13-21 August 1999 Improved Method for Measuring the Satellite-to-Satellite TEC in the Ionosphere by S. Syndergaard.

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Presentation transcript:

URSI XXVI General Assembly, Toronto, Canada, August 1999 Improved Method for Measuring the Satellite-to-Satellite TEC in the Ionosphere by S. Syndergaard H.-H. Benzon G. B. Larsen M. B. Sørensen P. Høeg Atmosphere Ionosphere Remote Sensing Division Danish Meteorological Institute

URSI XXVI General Assembly, Toronto, Canada, August 1999 Setting the scene: Ionosphere occultation principle

URSI XXVI General Assembly, Toronto, Canada, August 1999 Ionosphere tomography combining ground and space measurements Convenient to assume straight lines

URSI XXVI General Assembly, Toronto, Canada, August 1999 GPS observables and traditional TEC measure Disregarding troposphere, clocks & ambiguity bias: On occultation links the traditional measure is not exactly the straight line TEC Discrepancy becomes appreciable for large electron density gradients

URSI XXVI General Assembly, Toronto, Canada, August 1999 Occultation geometry

URSI XXVI General Assembly, Toronto, Canada, August 1999 S-S TEC with first order dispersion correction Mainly proportional to the square of vertical TEC gradients Accuracy depends on validity of spherical symmetry assumption (“major” term) (“minor” term)

URSI XXVI General Assembly, Toronto, Canada, August 1999 Simulated TEC residuals, double Chapman layers E-layer: Max. dens.: 2·10 11 m -3 Scale height: 5 km F-layer: Max. dens.: 3·10 12 m -3 Scale height: 60 km

URSI XXVI General Assembly, Toronto, Canada, August 1999 GPS/MET ionosphere profile, occ. 641, Feb Local time: 12:30 Latitude: 36 N Longitude: 144 E Solar flux: 73

URSI XXVI General Assembly, Toronto, Canada, August 1999 GPS/MET TEC profile, occ. 641, Feb Local time: 12:30 Latitude: 36 N Longitude: 144 E Solar flux: 73

URSI XXVI General Assembly, Toronto, Canada, August 1999 GPS/MET estimated TEC residuals, occ. 641, Feb

URSI XXVI General Assembly, Toronto, Canada, August 1999 Ørsted ionosphere profile, April Local time: 14:45 Latitude: 33 S Longitude: 13 W Solar flux: 113

URSI XXVI General Assembly, Toronto, Canada, August 1999 Ørsted TEC profile, April Local time: 14:45 Latitude: 33 S Longitude: 13 W Solar flux: 113

URSI XXVI General Assembly, Toronto, Canada, August 1999 Ørsted estimated TEC residuals, April

URSI XXVI General Assembly, Toronto, Canada, August 1999 Alternative estimate of straight line S-S TEC Corrects for first order dispersion effects Not sensitive to spherical asymmetry Drawback: clocks and POD needs to be solved (removed) traditional combination for comparison ( )

URSI XXVI General Assembly, Toronto, Canada, August 1999 Simulated TEC residuals, spherical asymmetry conditions

URSI XXVI General Assembly, Toronto, Canada, August 1999 Summary Satellite-to-satellite TEC  L 1 - L 2 may give TEC errors of order 10 TECU Not a big problem at low solar activity or night time (error < 1 TECU) May be a problem at day time, solar maximum Dispersion correction reduce errors depending on spherical symmetry assumption Alternative dual frequency combination can be applied, but then one needs to solve for clocks and POD Results can be used in ionosphere tomography to obtain more accurate straight-line satellite-to-satellite TEC