RHESSI TOHBAN REPORT 11/17/04 - 11/24/04
Hugh Hudson (hhudson@ssl.berkeley.edu)

1) Solar Activity

A low level of activity, but not an utter low - the daily GOES
average did not go below B. At present a new eager active region
has appeared at the SE limb and has been making C-class flares.

How many GOES flares occurred?
  Flares above B, C, M, X class were     28    12     0     0
And how many of these are listed in the RHESSI flare list?
  Flares above B, C, M, X class were      7     9     0     0
And how many had EXCELLENT coverage?
  Flares above B, C, M, X class were      4     7     0     0
       
There were RHESSI flares/GOES flares          32 /           40
over the time range 16-Nov-04 23-Nov-04

2) Memory Management

Memory usage began the week deep in the hole, but has recovered.
On the first BGS pass today the SSR fill was below 40%. RHESSI is
heading for a local maximum (Nov. 26) in length of orbit day
at > 74 minutes.

3) Data Gaps

18-Nov 13:05 - 15:50, unfortunately containing an interesting
fast flare at 15:00.

4) Special operations

From Mark: "The new table increases torque authority while in ACS
normal mode, from 30 amp-m^2 to 45 amp-m^2.  This is still well below
the 60 amp-m^2 used in ACS precession mode.  The new table was loaded
at 2004-323-00:52:17 UT.  The flight ops team will be closely
monitoring ACS performance."

5) Shutter-moving particle events

See 16-Nov, 20 Nov, 21 Nov ~ 20:00; we were driven into the A3 state.
And voila, the SOH daily averages of the particle rates reached their
5th-highest level in RHESSI history in the HE channel. The tohban
surmises that this resulted from the particle events of Nov. 8 or Nov.
10. But why was the injection so delayed? Were there two injections,
the 16th and the 20th? Note that these big particle events often
confused the flare finder and probably contributed to our SSR problem.

Another odd shutter motion took place 18-Nov 11:52 or so, with no
obvious cause (no GRB in the GCN circular listing). According to
David Smith, "The odd shutter movement on Nov 18 was due to an arc in
detector G6, which resulted in a temporary high fast-LLD rate and a
corresponding temporary dip in livetime.  The attenuators trigger on a
drop in the average livetime over several detectors, including G6.
They do not check to see if the deadtime is due to only one detector or
is shared equally."

6) Observing campaigns

None the tohban is aware of.

7) Next week's tohban

This week's tohban inadvertently left the beeper at home today and
therefore, according to a newly established precedent, will continue
to be tohban next week too.