OBSERVATIONS OF THE FLANK OF EARTHS BOW SHOCK TO-110-RE BY ISEE 3/ICE

The ISEE 3/ICE spacecraft made well over 100 crossings of Earth's bow shock between x(SEC)=−20 and −110 RE, most of them further away than −60 RE, while resetting its course for comet Giacobini‐Zinner. Magnetosonic Mach numbers MMS normal to the shock in this extreme downwind flank of the bow shock were generally no more than about 60%, often less than 35%, of their values at the subsolar point, so that this set of crossings consists of many examples of low MMS (MMS<3) crossings, including rare quasi‐parallel, as well as quasi‐perpendicular, cases. We tabulate the parameters of the crossings, display some of their magnetic, plasma wave, and spectral profiles at low MMS, and compare loci of crossings with the extrapolation of a model of earlier statistical success, showing that the model remains useful in the far flank. Copyright 1990 by the American Geophysical Union.