RHESSI Tohban report, 17-May-2005 to 23-May-2005
Pascal Saint-Hilaire/shilaire@ssl.berkeley.edu
(and Amir Caspi/cepheid@ssl.berkeley.edu from May 17 to 21)

1. Solar Activity

An M2.0 flare occurred at the beginning of the week (May 17th).
Data has not arrived yet, but RHESSI should have had good coverage.

Solar activity has decreased during the rest of the week, and the sun produced only
a handful of flares in the low Cs. Solar baseline level has remained pretty close to 
the B1 level, and has decreased to ~A6 in the last couple of days.



2. Memory Management

SSR fill level is at 3.9% as of 2005/05/23 11:00 PST. 
Front segments are still off during S/C night.


3. Decimation

The ACTIVE/ACTIVE mode was still in use.
Because of the low solar activity and the good state of memory management,
it was decided to switch to NORMAL/ACTIVE.

A note for David Smith:
The following web page:
	http://sprg.ssl.berkeley.edu/~dsmith/hessi/decimationrecord.html
has some typos, at least in the last three entries: The link names are "T6","T6", and "T6",
whereas the actual link are to tables "T3","T3", and "T4" (which I believe are correct).



4. Data Gaps

A large number of important data gaps:

GAP START TIME              GAP END TIME                   GAP (SEC)
2005-05-17T01:15:00.000 -- 2005-05-17T03:45:00.000       9000.0000
2005-05-17T07:50:00.000 -- 2005-05-17T07:55:00.000       300.00000

GAP START TIME              GAP END TIME                   GAP (SEC)
2005-05-18T07:45:00.000 -- 2005-05-18T09:00:00.000       4500.0000
2005-05-18T10:30:00.000 -- 2005-05-18T10:40:00.000       600.00000

GAP START TIME              GAP END TIME                   GAP (SEC)
2005-05-19T08:30:00.000 -- 2005-05-19T09:50:00.000       4800.0000
2005-05-19T11:00:00.000 -- 2005-05-19T13:50:00.000       10200.000
2005-05-19T17:50:00.000 -- 2005-05-19T21:25:00.000       12900.000

GAP START TIME              GAP END TIME                   GAP (SEC)
2005-05-20T00:40:00.000 -- 2005-05-20T03:35:00.000       10500.000
2005-05-20T06:05:00.000 -- 2005-05-20T07:40:00.000       5700.0000
2005-05-20T10:05:00.000 -- 2005-05-20T10:10:00.000       300.00000
2005-05-20T11:00:00.000 -- 2005-05-20T13:20:00.000       8400.0000
2005-05-20T16:40:00.000 -- 2005-05-20T20:15:00.000       12900.000
2005-05-20T23:10:00.000 -- 2005-05-21T00:00:00.000       3000.0000

GAP START TIME              GAP END TIME                   GAP (SEC)
2005-05-21T00:00:00.000 -- 2005-05-21T01:55:00.000       6900.0000
2005-05-21T04:30:00.000 -- 2005-05-21T06:05:00.000       5700.0000
2005-05-21T10:00:00.000 -- 2005-05-21T11:05:00.000       3900.0000
2005-05-21T11:45:00.000 -- 2005-05-21T14:45:00.000       10800.000
2005-05-21T18:30:00.000 -- 2005-05-21T22:00:00.000       12600.000

GAP START TIME              GAP END TIME                   GAP (SEC)
2005-05-22T01:20:00.000 -- 2005-05-22T04:10:00.000       10200.000
2005-05-22T14:25:00.000 -- 2005-05-22T18:10:00.000       13500.000
2005-05-22T21:15:00.000 -- 2005-05-23T00:00:00.000       9900.0000

(The Observing Summary IDPU flag is at the expected 20 value, 
but regularly goes down to 0 around data gap times.)

Most of these data should be recoverable (as of the writing of this report, 
some of them already were).


5. Misc

-It seems the SAA has expanded a little: Mark reported false alarms producing shutter 
state changes shortly after official SAA passages --> to be investigated.

-As of 2005/05/23, S/C spin rate is 14.612 rpm (4.106 s period).

-To future Tohbans: You can add my email (shilaire@ssl.berkeley.edu) and Iain's (hahhah@ssl.berkeley.edu) 
to the list of recipients of Tohban reports.