CORRELATIONS BETWEEN MAGNETIC-FIELD AND ELECTRON-DENSITY OBSERVATIONSDURING THE INBOUND ULYSSES JUPITER FLYBY

The spacecraft Ulysses flew through the Jovian magnetosphere during Fe bruary 1992. This paper compares the magnetic field observations recor ded during the inbound pass of the flyby with the electron density as derived from the URAP instrument. In general, it is expected that the density variations will anti-correlate with the magnetic field strengt h in order to maintain pressure balance, although there may be instanc es when a temperature or energy rise alone could balance the static st ress. Furthermore, there is the possibility that a dynamic process cou ld occur which would cause both the density and field magnitude to ris e in unison. In the middle magnetosphere, anti-correlation is found to exist between the two data sets; however, in the outer magnetosphere (which was characterized by very disturbed fields) and in the transiti on region between the outer and middle magnetospheres, there is no sim ple relationship between the density and field. Examples of anti-corre lation, temperature or energy increases and dynamic processes are foun d.