April 16, 2002
							    H. S.  Hudson
							     

RHESSI tohban report for week starting Tuesday, April 9, 2002
(DOY 099-106, 2002)

1. Solar activity.

Activity was high, with 10 M-flares but no X's. This is a strange
pattern.  One event (April 15) is a clear example of a "slow LDE", ie
one that rises slowly as well as decays slowly. These are known to have
extremely long-duration hard X-ray emission plus coronal soft X-ray
structures of a rare type.  This will be interesting to analyze in
Zurich!

2. Memory management

This week we mainly operated in the A13 automated mode. We initially
tried to go to A013 for a day on DOY 100, the 03:31 pass, but due to
mis-communication between tohban and operator this was simply a
manual shutter-open command. RHESSI immediately saw a flare and put
the shutter back in.

Here is the shutter status record, as maintained by David Smith:

2002 04 11 05 58 0
2002 04 11 07 40 1
2002 04 11 19 08 A013
2002 04 12 19 16 A13
2002 04 14 19 45 A013
2002 04 14 21 21 A13
2002 04 15 21 30 A013
2002 04 15 23 15 A13

The brief look at shutter-out on April 15 was the slight hope of
catching a glimpse of the jet activity noted in AR9100 - see
http://isass1.solar.isas.ac.jp/sxt_co/020412.html

4. Coordinated observations

TRACE continues to operate at high cadence (12 s in 195) to support flare
observations.

5. Other suggestions

* Tohbans need access to NASA contact schedules ahead of time
* The SAS sampling rate ought to be on the "HESSI spacecraft status" page
* Need graphic showing GOES, memory level, and dump times for past 3 days

6. Links

I've collected some of the more frequently used Web links onto a single
page, namely

http://sprg.ssl.berkeley.edu/~hhudson/tohban_links.html