RHESSI Tohban report, 10-Feb-2004 to 17-Feb-2004*
Hugh Hudson, hhudson@ssl.berkeley.edu

1. Solar Activity

Abysmal. On 2/15 the GOES base level was at A8.5. Statistics
are as follows:

How many GOES flares occurred?
  Flares above B, C, M, X class were     23    10     0     0
And how many of these are listed in the RHESSI flare list?
  Flares above B, C, M, X class were      8     4     0     0
And how many had EXCELLENT coverage?
  Flares above B, C, M, X class were      6     1     0     0

There were RHESSI flares/GOES flares          56 /           33
over the time range 09-Feb-04 17-Feb-04
      
2. Memory Management

Memory remained good, roughly 0-30% during the contact passes.

3. Data Gaps

Feb. 12, 0200-0300 - no particular solar activity
Feb. 13, 0700-0900 - no particular solar activity

4. Operations Summary

The SOH daily plots suggest that the effects resulting from the valve
operation were transient.

5. Other

The particle counts may have turned a corner: the daily maxima are coming
down, although the minima stil are rising. The year 2003 seems to have
been remarkable. Or, is this just due to the natural variation of the
RHESSI orbit? Or are there competing effects?

An eyeball-estimate Fourier analysis shows that these counts, over the
first two RHESSI years, have a clear predominant cyclic variation with
a period of 2*365/14 = 52 days. This must be the RHESSI orbital
precession period (about 220 nHz). A *real* spectrum shows that the
harmonic is strong and that both peaks are stronger in counter B.

6. Next Tohban

First pass 16:37 Feb. 17

* On this day in history, the Jolly Gorks became the BPOE (1868)