Processing of DMSP Magnetic Data and Its Use in Geomagnetic Field Modeling
Abstract
The DMSP F-7 satellite is an operational Air Force meteorological satellite which carried a magnetometer for geophysical measurements. The magnetometer was located within the body of the spacecraft in the presence of large spacecraft fields. In addition to stray magnetic fields, the data have inherent position and time inaccuracies. Algorithms were developed to identify and remove time varying magnetic field noise from the data. Techniques developed for Magsat were then modified and used to attempt determination of the spacecraft fields, of any rotation between the magnetometer axes and the spacecraft axes, and of any scale changes within the magnetometer itself. The corrected data were then used to attempt to model the geomagnetic field. This was done in combination with data from Magsat, from the standard magnetic observatories, from aeromagnetic and other survey data, and from DE-2 spacecraft magnetic field data. The results obtained are inconsistent and contradictory. Characterization of the problem is clearest when model coefficients are compared between models with DMSP data only and models with other data types only. In that case the gl(1) term in the DMSP models is consistently lower in magnitude by 10-25 nT from the trend inferred from models based on other data.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1989
- Accession Number
- ADA216440
Entities
People
- D. Chinn
- J. R. Ridgway
- R. A. Langel
- T. J. Sabaka
Organizations
- National Aeronautics and Space Administration