Tom Narock - 9/7/2011 While using the IMP 8 bow shock crossings in VHO/VMO, it was found that ~40 time intervals had consecutive spacecraft transitions into the same regions, e.g. crossing 1 = "into solar wind" and crossing 2 = "into solar wind". This indicated that either a crossing was missed or a crossing was labeled incorrectly. Visual inspection ofIMP 8 data indicated the following deletions needed to be made to the IMP 8 crossing lists. The file imp8_bowshock_additions_narock.txt contains the crossings that were added to the list. ** NOTE: The final file, imp8_bowshock_updated_narock.txt, does NOT contain upstream/downstream values for the added shock crossings. In addition, the crossing sequence numbers are incorrect as shocks have been added/removed. ** Year Doy Hr Mn Changes 1975 15 17 54 spc transition direction was incorrect 1983 270 12 9 removed 3 shocks 1983 270 19 52 removed shock 1984 257 13 50 removed shock 1984 257 17 12 spc transition direction was incorrect 1984 263 12 19 removed shock 1984 288 18 40 removed shock 1984 296 11 27 removed shock 1986 124 9 13 removed shock 1988 309 1 24 removed shock 1989 283 4 17 removed shock 1991 131 17 35 removed shock 1995 282 16 20 removed shock 1996 151 23 47 removed shock 1997 11 12 16 spc transition direction was incorrect 1997 66 12 36 removed a shock 1998 128 2 59 remove a shock 1999 25 23 23 remove 1999 45 7 51 spc transition direction was incorrect 1999 63 20 52 remove 1999 76 21 12 remove 1999 365 22 40 remove 2000 1 3 9 remove 2000 1 5 4 remove 2000 1 5 5 remove 2000 39 17 3 single crossing replaced with multiple crossings