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Comparison between methods to compensate for the secular motion of the South Atlantic Anomaly

dc.contributor.authorHeynderickx, D.
dc.date1996
dc.date.accessioned2017-05-23T12:08:32Z
dc.date.available2017-05-23T12:08:32Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/5546
dc.descriptionIn order to avoid the prediction of artificially high particle fluxes, the static NASA trapped radiation models AP-8 and AE-8 should only be used with the same geomagnetic field models, for the same epochs, with which they were constructed. It is possible to correct for one aspect of the secular variation of the geomagnetic field, i.e. the secular drift of the local particle flux maximum in the South Atlantic Anomaly (SAA). The secular motion of the SAA may be compensated for by a coordinate transformation on the satellite trajectory corresponding to the inverse of the secular change of the geographic coordinates of the SAA. Three such transformations, defined by different approximations to the location of the centre of the SAA, are presented. The secular motion of the SAA is best represented by a longitudinal westward drift at a rate of 0.3°/year, in accordance with the findings of other authors. For a typical Shuttle orbit in the vicinity of the SAA, flux increases of a factor ten were found when the longitudinal correction is applied. In addition, the time of the encounter with the SAA may differ by as much as one orbital period from the time predicted without the correction.
dc.languageeng
dc.titleComparison between methods to compensate for the secular motion of the South Atlantic Anomaly
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeApproximation theory
dc.subject.freeGeomagnetism
dc.subject.freeMagnetic fields
dc.subject.freeMathematical models
dc.subject.freeMathematical transformations
dc.subject.freeOrbits
dc.subject.freeSatellites
dc.subject.freeTrajectories
dc.subject.freeCoordinate transformation
dc.subject.freeEccentric dipole approximation
dc.subject.freeGeomagnetic fields
dc.subject.freeRadiation flux
dc.subject.freeAtmospheric radiation
dc.source.titleRadiation Measurements
dc.source.volume26
dc.source.issue3
dc.source.page369-373
Orfeo.peerreviewedYes
dc.identifier.doi10.1016/1350-4487(96)00056-X
dc.identifier.scopus2-s2.0-0030151392


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