Date     Dirn   Plasma Sheet      Polar Cap         Highest
                    UT      ila      UT      ila      UT      ila

05-May-1997   P   14:50:46  62.4   15:04:19  75.4   15:15:00  88.1 
05-May-1997   E   15:33:00  65.0   15:19:35  83.4   15:15:00  88.1 


Dirn is the direction of movement of Polar; "P" is poleward, "E" is
equatorward. 

The remaining columns give the date, times and invariant latitudes when Polar
crossed the low latitude plasma sheet boundary and the polar cap boundary, and
of the highest invariant latitude which Polar reached on that pass. 

The boundaries were determined using the same  method demonstrated in
Andersson, L., W. K. Peterson,  and K. M. McBryde (2004), Dynamic coordinates
for auroral ion  outflow, J. Geophys. Res., 109, A08201, doi: 10.
1029/2004JA010424. Note Figure 1 in that paper.

Both the plasma sheet and polar cap boundaries used here are determined from
electrons measurements and are the lowest latitude observed.