RHESSI Tohban report, 2-sep-2002 to 9-sep-2002

Hugh Hudson (2-6)
David Smith (7-8)

1. Solar Activity:

As of September 7, the activity was low to moderate:

Mean GOES low-channel level:  1.14e-6 (Sep. 2 - Sep. 6)
M-flares 1
X-flares 0

There was one remarkable LDE event, 5-Sep 16:18 or so, with reputedly
spectacular interplanetary radio emissions and a particle event, 
C5.2 @ N09E28.

2. Memory Managment:

Because of the moderate activity and because of the problems listed
below (effectively, four dumps lost) we could only afford 16 hours of
shutter-open data:

A13 -> A013 6-sep 08:46
A013 -> A13 7-sep 00:22

Note that the tohbans' shutter log has some omissions from the previous
week.

3. Data Gaps:

None due to pointer motions.

4. Problems

Two passes were lost September 4, one BGS and one WPS, for different reasons.
These passes had to be replayed September 7 because of processing confusion.
The loss of four dumps in a week of low activity resulted in forcing
RHESSI into A13 most of the time - we need more telemetry support.

During the re-play on September 7 the read pointer setting resulted in
an apparent SSR fill level above 80%. We note that this kind of re-play
will result in decimation levels that probably should not be there.
However the re-play does take time, so our system is a little bit
vulnerable to this.

5. Question of philosophy

The shutter-open data (A013) are more interesting, at least from the solar
point of view, than the A13 data, except when flares happen. It would be
possible for us to remedy the lack of sufficient telemetry coverage
by simply deleting 10-20% of each day's data retrospectively through 
pointer resets. Would this be a good thing to do? The demerits of this
approach include less coverage for rare truly remarkable things, such as
over-the-limb solar events (worth their weight in gold) or non-solar
events (value incalculable).

6. Tohban schedule

It's now the responsibility of the tohbans to maintain the tohban
schedule page, which is at

/home/tohban/public_html/RHESSI_Tohban_Schedule.html

It's just a matter of cutting and pasting the 9 lines of the last <tr>
entry, with the top table entry being the most recent tohban.