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Background flux calculation


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A quick search has lead to the following:

The sequence of operations is:
1. Calculate hourly averages from XRS-B (0.1-0.8 nm) one-minute fluxes if there is at least 1 valid data point for the hour.

2. Divide 24 hourly averages into three equal blocks of 8 hours, x 8hr: e.g., 00-07, 08-15, and 16-23.

3. Calculate the minimum hourly average for each of the 3 blocks.

4. Perform a simple average of the minima of the 2 outer blocks for an interpolated minimum at noon.

5. Set the X-ray daily background (xdb) as the mid-day minimum if at least one of the three bins has good data. Set the xdb flag=0.
a. If all three 8-h blocks have good data, select the lower minimum from either the middle bin or the interpolated noon bin.
b. If the middle block has no data, select the interpolated minimum.
c. When either the first or third block does not have data, select the lower of the two remaining blocks.
d. If only one block has data, use its value.

6. If no blocks have good data, set xdb to the fill value and set the xdb flag=1 for missing data.

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