Observations of the flank of Earth's 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 R E , most of them further away than −60 R E , while resetting its course for comet Giacobini‐Zinner. Magnetosonic Mach numbers M MS 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 M MS (M MS <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 M MS , 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.