In some cases a sub-type is also defined, e.g. to distinguish outbound boundary crossings from inbound crossings. A table of the major event types is shown below. Each PSE catalogue contains a description of all the codes, and only the codes, that represent event types and sub-types in that catalogue. These are held in the CDF global attribute TEXT starting at the second element of that attribute. The first element contains a reference to the JSOC paper in the Cluster issue of Space Science Reviews .
Northbound events occur when the neutral sheet moves more rapidly southward than the spacecraft.
For more information on models and analysis used by JSOC see our paper in the Cluster issue of Space Science Reviews . The list below shows an example of event descriptions extracted from the CDF global attribute TEXT in a test catalogue for October 2000. This returns the TEXT attribute as a string array with 24 elements. The times of all telemetry mode changes and instrument command sequences are represented by JSOC as offsets from events. This approach facilitates the building and revision of the payload command schedule - because that schedule is explicitly tied to scientifically meaningful events.