RHESSI Tohban report, week ending Jan 12, 2003

Hugh Hudson, Paula Balciunaite

1. Solar Activity:

Solar activity was moderate, with 3 M-class flares (M1.0 and M4.9 on
01/07 and M1.0 on 01/09), and 39 C-class flares. Of course, there were no
X-class flares. RHESSI data exist for two of the M-flares, and one
of them (01/07, ~23 h) was extremely impulsive and probably interesting
to analyze. 5-7 fairly large active regions have rotated into view
over the past week, so we can expect some activity over the next week or
two. 

2. Memory Management:

We were able to operate mostly in front-segment decimation state T3 (see
http://sprg.ssl.berkeley.edu/~dsmith/hessi/decimationrecord.html 
now linked on the tohban page), our "normal" setting since 15-Nov-02.
Activity and other factors made us do T4 9-Jan 20:03 to 10-Jan 21:49.

Martin Fivian has prepared and sent around a table estimating the
telemetry usage for SAS as a function of its settings.

3. Data peculiarities: 

The tohbans should check Jim's nice weekly parameter plots,
http://sprg.ssl.berkeley.edu/~jimm/hessi/hsi_1day_sohdata/index.html
once a week or so. This week... the interesting one might be
http://sprg.ssl.berkeley.edu/~jimm/hessi/hsi_1day_sohdata/hsi_1day_isc_ssr.gif
which shows what must be a solar-rotation effect ("active longitudes").
One side of the Sun has become inactive. We can manage the SSR by 
tweaking the decimation level, but we have not had to do much of that,
so this is a good approximation to the total data acquisition.

4. Tohban