Hrc S High Precision Background Maps

The background map is created as follows:

• Add up all HRC S high resolution event 1 fits files for a given year.
• Create an image file with bin size of 128x128 pixels.
• Compute the background time of the year (including dead time correction ) normalized to the background count rate per sec per pixel.

The table blow shows an overview of stowed background changes over years. The fist column is year, the second column is a dead time corrected yearly comulative background time. The third column is a stowed background map with event 1 data scaled so that details show up. The fourth column is the same data but unified scale for all years. The fifth and sixth columns are similar to those of the third and the fourth, but status bit corrected data. If you click on the year or one of the maps, it will take to the larger map of the map.

Year	Time (sec) Total Event Numbers	Evt1 (Peak Area)	Evt1 (Same Scale)	Lev2 (peak Area)	Lev2 (Same Scale)
2000	10,074 415,820
2001	5,484 264,617
2002	16,682 776,334
2003	16,897 785,327
2004	798 44,735
2005	22,212 1,281,328
2006	14,551 966,698
2007	19,527 1,664,272
2008	11,707 882,970
2009	1,505 127,995
2010	14,010 994,865
2011	1,516 90,965
2013	4,164 219,880
2014	5,582 283,245
2015	11,155 528,655
2018	7,237 477,725
Cumulative Maps
Total	163,101 9,805,431

If you have any questions about this page, please contact: swolk@cfa.harvard.edu.