EFW Data Validation
This page has not been completed, and is probably not yet useful.
Cluster Hardware Issues
As of 2002-09, there are three main hardware issues that users should be aware of:
The likely cause of these failures is a failure of the 12 V power to the
preamplifier in the puck. This is likely a mechanical issue, and is
not expected to be remediable. Further information can be found on
the operations page [link].
- There have been two probe failures:
SC1 P1 failure 2001-12-28
SC3 P1 failure 2002-07-29
These changes have occured sporadically as our understanding of the instrument
and its best settings has improved. These changes will generally be
transparent to users of the electric field data, although there is a noticeable
effect on the spacecraft potential. Further information can be found
on the operations page [link].
- The bias current has been changed a few times throughout the mission:
- 2001-02-01: 180nA on P12, 220nA on P34 (initial setup)
- 2001-04-25: 180nA on all probes
- 2001-06-01: 140nA on all probes
- There was a filter malfunction on SC3 probe 2, so that the filter settings have been changed:
- 2001-02-01 - 2001-06-xx: 10Hz filters on all SC
- 2001-06-xx - 2001-07-30: 10Hz filters on all SC, but SC2 probe 3 filter malfunctioning
- 2001-07-30 - 2001-09-02: 180Hz filters on all SC
miscellaneous, and generally short-lived, interuptions in the data have occured.
These intervals are listed on the operations page [link]
Back to "How to use EFW"
last modified on 28-Nov-2002