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•n in >75)) the :ular ime, 3RF 965) 1 for i the two ) are than d by show lance verse it the jmbka high altitudes attained by some satellites, it is frequently possible to use a reduced degree of expansion in the field model. Omitting higher multipoles permits reductions in computation time. An estimate of the error resulting from this truncation can be obtained by comparing the full field model with its truncated forms, as shown in Tables 5-2 and 5-3. The choice of degree should be based on the accuracy of the model in Table 5-1 and on the strength of the perturbations of the main field discussed below. For a given altitude, those truncation errors to the left of the heavy line in Table 5-2 exceed the errors in the field model itself. Generally,

Table 5-2. Field Truncation Errors (nT) Using the 1GRF (1965) (From Trombka and Cain (I974J)

altitude

degree

1 (dtpolei

2 touaorupolei

0 0

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