0.0625-s Chronicle Data, NEV Coords, with Intermediate-Accuracy Attitude

Description

This data set, provided by the principal investigator, consists of scalar and vector magnetometer data on binary magnetic tape created on an IBM 360/91 computer. In this data set the vector magnetometer data have been converted to the North, East, and Vertical coordinate system using the intermediate-quality (nominally 20 arc min) attitude data. These data are at the highest possible time resolution, which is 8 scalar magnitude measurements and 16 vectors per second. Each logical record consists of an orbit data record, scalar magnetometer data records, and vector magnetometer component data records. Each record type contains data type, modified Julian day of first observation, milliseconds (ms) of day, time increment between observations (ms), and time offset. The orbit data records contain 128 values of inertial coordinates, invariant latitude, geomagnetic time (hours), and dip latitude. The scalar data records contain 512 values (in nT) of scalar observations. The vector records contain 1024 values (in nT) of vector component data. For additional information see (1) R. A. Langel, "Magsat Data Availability," The IMS Source Book, p. 109, American Geophysical Union, Washington, D.C., 1982, TRF B36471; (2) R. A. Langel et al., "Magsat Data Processing, A Report for Investigators," NASA Technical Memorandum 82160, November 1981, TRF B33579; and (3) "Magsat Preliminary Results," a collection of 36 papers in Geophys. Res. Letters, v. 9, pp. 239-376, April 1982. This data set is entered under NSSDC ID numbers 79-094A-01A and 79-094A-02A.