APPENDIX_B.TXT

PURPOSE: Document all know anomalies in the SNOE data set
   NOTE: these anomalies are not listed in any particular order

A1: There are days with no data. The cause is one of two reasons. (a) The
S/C was not able to deliver sampled data to Earth due to computer resets
or ground station LOS. (b) The processing routines discarded the data that
was sampled because of extra noise, S/C pointing errors, etc.

A2: Daily average files are comprised of the average of all orbits made
during a given day. On occasion, only one orbit's worth of data is
'averaged' into the daily average files. The day average therefore has a
poor signal to noise (SNR) ratio. Day 1999.083 and 2000.044 (geo) are
examples of this type of data.

A3: yyyyddd 1998259 to 1998263 has the magnetic coordinates calculated
using equations 3 and 39 of Fraser-Smith (Rev Geophys, 1987). This differs
from the rest of the data that uses a CGM lookup table on a one degree
geographic grid.

A4: Partial data exists (missing latitudes) for numerous days. Note that
this anomaly is usually removed by the processing that creates the L4
data.

A5: PMCs are visible in the data. They typically appear in the northern
hemisphere from May through August, and in the southern hemisphere from
November through March. The location in the SNOE database is typically at
96.6 km, between 60 and 90 degrees latitude. Note that this is not
necessarily the actual location of a PMC, only where it appears in this
dataset.