Perikron

We do not examine the 6 hours surrounding perikron as the ion cyclotron waves in this region have already been extensively discussed [Leisner et al., 2006]. Perikron was close to 2100 on 24 December and the inbound pass cuts through the dayside magnetosphere.

I kept chugging away on ion, adjusting my path so I'd hit perikron in the B ring with orbital velocity.