Planck early results
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A zoom of a seven day period on the temperature of a helium tank is shown before (top panel) and after (middle panel) the RF transponder was left permanently on (see also Fig. 7), and illustrates the reduction in the daily temperature variations achieved by this operation. Smaller variations remain, due to thermal cycling of other elements (in this case the LFI Data Processing Unit), and are clearly visible in the middle panel. The bottom panel shows the typical effect of weekly updates of the operational parameters of the Sorption Cooler (marked as vertical lines) on the temperature of the third V-groove.

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