Tohban Report 2009-02-18

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Tohban Reports
Start Date: 11 Feb 2009
End Date: 18 Feb 2009
Tohban: Hugh Hudson
Tohban email:
Next Tohban: Albert Shih
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Two nice CMEs from the tiniest of flares, but with all of the bells and whistles (waves, dimmings, sigmoids) from an old-cycle regions. RHESSI observed most of one of them (a B3), but only got a glimpse of the other, about B5]. Both of these events had very nice CMEs - sigmoid, dimming, wave, the works.

The figure below shows how the solar minimum appears now. This updates the plot from a Nugget posted in May 2008.

The 10-cm fluxes around solar minima, showing how our current one (red) sticks out like a sore thumb!

Data Gaps and problems

9-Feb 01:15 + 2 orbits, bad data

17-feb-09 02:45, bad data

18-feb-09 02:15, bad data


An unusual period of rapid background variability at high energies happened 8-Feb - see here. I can't see any sign of this in the monitor plots and am perplexed.

The fast soft events (3-6 and 6-12 keV) that looked like flares, weren't. They're no doubt due to arcing in one detector. See here for an example.

Next Tohban

Albert Shih (

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