ACIS Science Instrument Background

Enteir Period

Last Three Months

This page shows scientific instrument background (SIB) data based on ACIS observations, using Level 1 data. The SIB is computed using the following steps.

If you are interested in checking the scientific instrument background computed with Level 2 data set, please to go to level 2 SIB page.

On each page, you find:

Name Low (keV)Hight(KeV)Description
SSoft 0.00 0.50 Super soft photons
Soft 0.50 1.00 Soft photons
Med 1.00 3.00 Moderate energy photons
Hard 3.00 5.00 Hard Photons
Harder 5.00 10.00 Very Hard photons
Hardest10.00   Beyond 10 keV

The following three links give long term trending pages.

Last Three Month Details

Last Twelve Month Details

Entire Period Details

The links on the following tables give one year trend of the year and trend of each month of the year.

Year Full Year JanFebMar AprMayJun JulAugSep OctNovDec
2021--- 01 02 03 04 05 06 07 08 09 10 11 12
20202020 01 02 03 04 05 06 07 08 09 10 11 12
20192019 01 02 03 04 05 06 07 08 09 10 11 12
20182018 01 02 03 04 05 06 07 08 09 10 11 12
20172017 01 02 03 04 05 06 07 08 09 10 11 12
20162016 01 02 03 04 05 06 07 08 09 10 11 12
20152015 01 02 03 04 05 06 07 08 09 10 11 12
20142014 01 02 03 04 05 06 07 08 09 10 11 12
20132013 01 02 03 04 05 06 07 08 09 10 11 12
20122012 01 02 03 04 05 06 07 08 09 10 11 12
20112011 01 02 03 04 05 06 07 08 09 10 11 12
20102010 01 02 03 04 05 06 07 08 09 10 11 12
20092009 01 02 03 04 05 06 07 08 09 10 11 12
20082008 01 02 03 04 05 06 07 08 09 10 11 12
20072007 01 02 03 04 05 06 07 08 09 10 11 12
20062006 01 02 03 04 05 06 07 08 09 10 11 12
20052005 01 02 03 04 05 06 07 08 09 10 11 12
20042004 01 02 03 04 05 06 07 08 09 10 11 12
20032003 01 02 03 04 05 06 07 08 09 10 11 12
20022002 01 02 03 04 05 06 07 08 09 10 11 12
20012001 01 02 03 04 05 06 07 08 09 10 11 12
20002000 01 02 03 04 05 06 07 08 09 10 11 12


Last Updated: Nov-03-2021
If you have any questions, contact: swolk@cfa.harvard.edu